1. How to read this manual
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1. 23 4 Using Ramsete Now we ll try to learn the basics of Ramsete following all steps of a typical application We want to map the situation created by a concentrated noise source in a reverberating environment i e a factory We measured on site the reverberation time and the sound pressure level of the noise source according to ISO 3744 3746 standard We also annotated the size and the materials the factory was made of e We ll start inserting into Source Manager all the data measured with the phonometer in order to create a noise source with the same characteristics of the real one e Then we ll sketch the factory geometry using Ramsete CAD assigning the proper material to each face Finally we ll properly place the noise source and the receivers e We ll use Ramsete Trace to create a file with all the results e Finally we ll use Ramsete Graph and Ramsete View to analyze these results verifying the similarity between the computed reverberation time and the one measured on site We ll have to modify the geometric model and the source parameters until the two reverberation times are equal e Now we ll be able to study an intervention to improve the acoustic situation We ll edit our model with Ramsete CAD and recalculate the result file in order to verify the benefits or the drawbacks of our improvements Below we are presenting the data measured following the ISO 3744 3746 standard with a parallelepipedal envelo2. File Edit Chart Table Window B e ES ES ES EE 0 10 20 30 40 50 60 70 The cursor can be moved in the same way as described above 3 Impulse Response SPL This command will pop up a window with frequency response of the selected receiver for each octave linear and weighted A Ramsete Graph 1 0 FABBR15 A SPL R File Edit Chart Table Window 8K 16K L THE CURRENTLY SELECTED FREQUENCY IS OBVIOUSLY IGNORED IN THIS CASE 74 T10 This command displays the Tig decay time chart T15 This command displays the Tis decay time chart T20 This command displays the To decay time chart 125 This command displays the Tos decay time chart T30 This command displays the Tas decay time chart op GE edges GR 5 160 This command displays the T decay time chart Ramsete Graph 1 2 c ramsetelslucia a Reverb T20 R File Edit Chart Table Window BHEBEBBBRBRBBISRBERISERREPFBIPIBPIERBIPSIPEBISEEBIEBIE 28168 225 250 18 26 LY 5207252 Ae Re Re
3. Header vi Source Mame 9040 Manufacturer 1st frequency band 1000Hz Last frequency band 4000 Hz where you can insert the source and manufacturer name the first and last significative frequency Info Displays a window with general information about the current source Freq 315 163 125 250 500 1000 2000 4000 8000 16000 Power Level dB 140 91 0 00 Directivity 10 16 60 0 00 l 110 00 0 00 i 2 8 00 0 00 i 7 40 0 00 Here we can see the source type the sound power level in dB the directivity the sensitivity the electric impedance and the efficiency Data This command displays the directivity coefficients of each point of the balloon for the selected frequency Directivity Data 61 E Standard This command opens the following 5 windows Source Manager 1 0 DARAMSETE SOURCES EVLONGHPEVHP9048 5PK File Edit View Window Help Freq 315 163 12334 250 500 1000 2000 4000 8000 16000 Power Level dB i 0 00 000 000 26 143 65 140 91 0 00 Directivity 0 00 000 000 17 70 16 60 0 00 0 00 000 000 00 113 00 110 00 0 00 0 00 000 000 800 800 000 Efficiency x 0 0 00 000 000 13 90 740 0 00 Header Speaker Name Manufacturer 7 4 Window Menu Cascade Shift F4 This command presents the typical Windows behavior source Manager 1 0 DARAMSETEISOURCES EMLONGHPEVHP9043 SPE File Edit View Window Hel
4. dB 120 110 100 3t 80 70 integrated response Schroeder decay curve Ramsete Graph 1 0 FABBR15 SCH 31 5Hz R File Edit Chart Table Window See 18 octave spectrum in every receiver point Ramsete Graph 1 0 15 A SPL R File Edit Chart Table Window numerical tables SPL reverberation times Ramsete Graph 1 0 File Edit Chart Table Window ne TA FABBR15 A SPL TS VT ELM Ha ENER These tables can be easily exported to any spreadsheet application Excel or Quattro pro by performing a simple copy and paste clipboard operation 19 3 6 Ramsete View The program postprocesses CAD models and Ramsete Graph data and generate perspective views of the rooms mapping all the acoustic data in three dimensions You can display the room from every point of view by simple positioning of an imaginary camera Ramsete View 1 0 File Edit View Map Blanking Surfer Help Ramsete View D TESIKRAMSETESARCHIVIDSSLUGCIA N Mi un NAM 1 3 44 Focal lenght Camera Position X Y Z Target Position 170 275 120 Manual Redraw EEE EEE You can map the computed parameters in two dimensions Ramsete View 1 0 Ed
5. gt Ne gt gt gt gt gt Receiver n 1 Sound source Reflecting surface oo PNR BEE 2 5426 eee ENR 2 70 ee gt Pyramid axis cone or beam ee In this way we need to correct the computed impulse response through an additive or multiplicative method but neither one can be safely applied in these conditions where statistical acoustics hypothesis are not met Ramsete has been developed with the explicit intention of solving all the limits of these kind of modelling that fits well in wide environments such as theaters and factories Our pyramid tracer keeps in account the diffraction caused by free edges of shielding wall or other hurdles and computes the energy that passes through surfaces with a finite phono insulating property Next picture shows the isotropic sphere subdivision according to an algorithm studied by Tanenbaum et al based on the progressive bisection of the spherical surface starting from eight triangles The tracer follows a pyramid s history to a fixed depth or on a time basis in order to build the full sound queue of each receiver It doesn t make any assumption on the acoustic field diffusion so that we can have different reverberation times for each point double slope decays highly delayed echoes etc The necessary sound queue correction is of multiplicative type It s based on t
6. Blanking 1 for Inner Blanking and then draw If your answer is 0 the mapping will take place inside the polygon that you ll draw otherwise it will be blanked inside of it At this point a small 2D CAD system will switch on to allow you to insert the polygon vertices In the bottom line you can see the current cursor position 91 Hamsete View DARAMSETE MARZIA BAY File Edit View Map Blanking Surfer Help Ramsete View D XRAMSETENMARSIA RAY o 85 95 75 94 103 102 101 100 99 98 g7 111 ee 49 50 51 65 72 109 a a a a 108 340 41424344 4546 47 4864 a 44 1011 12 13 14 15 1663 69 106 a a a 4 5 25 26 27 28 29 30 31 326 g4 d g2 8i 80 79 78 amp 9 B B o 104 Focal lenght mm 36 05 5 68 Em pan You SHOULD BLANK ONLY AREAS THAT DON T CONTAIN RECEIVERS JA T He BLANKING POLYGON SHOULD ALWAYS BE CLOSED Save This command saves the work performed with the common save dialog Save a Blanking File Home file Directory d Xramsetexmarzia bin d ramsete armani blr marzia ramsete slucia sources Tipo file SURFER s Blanking Files d stacvol 000 This file can now be used the Mapping Options dialog box 22 Mapping Options 92 D 10 6 Surfer Menu s Grid Topo Plot Set Plotter Activates the Grid su
7. D WG CRE 5 Autoresize This command enables disbles the automatic computation of the minimum and maximum values in Charts in order to resize them accordingly 9 4 Table Menu In this menu all commands display a table containing data for each receiver and frequency so the current selections are not influent 75 GR GE GO OG em T20 T25 130 160 This command displays the SPL table This command displays the Lig decay times table This command displays the Tie decay times table This command displays the Tao decay times table This command displays the Toc decay times table This command displays the Tas decay times table This command displays the Too decay times table This command displays the Early Decay Times table 9 27 221 87 A 6 ES SCANDIA A EDT EEE e 25 18 821 8 2 AmS 1541 18 i UTNE 6121 7 SOE 2 1521 7 335 Jo SUD E 275 15 421912413 05411 902 18 204 5 185 760 24721 0 00011882217 532 18 138118 1181 047 18 883118 245 15 781 7 660 2 542 0 00018 72717 526 19 001 18983189141816418 135 18 511 7 03 2468 225445311218 18 814 18 797 18 728 18 582 17 972 15 520 7 569 2 145 1 208 18 325 17 156 187381872 1187871851718103415555 7 889 2148 1 185118 39417 167 88 16 80510 06010 79910 65017 953
8. Window The procedure to draw a window is similar to the one described for a door G Floor the only difference is the elevation dialog box Window size Heigth m 1 Elevation m zl 41 wii Hole This tools allows you to make holes into walls First of all you should select the wall to perforate than you describe a closed polygon clicking on its vertices The last point of the polygon should coincide with the first one If you draw a polygon with three vertices only you ll be asked if you are trying to draw an arc CONFIRM Is this an arc If you answer No a triangular hole will be drawn otherwise it will pop up a dialog asking you the number of segments that approximate to the arc The number of steps is automatically suggested by the program and you can increase it if you wish but keep it as small as possible to reduce computation times fx You CAN T DUPLICATE OR MIRROR HOLES WITHOUT SELE CTING THEIR WALL E You CAN DRAW HOLES IN THE AXONOMETRIC VIEW Source You specify the position of a source drawing a segment from its real position to the point it s aimed at This is very important for the correct computation of the sound field of directive sources At this point you ll be asked for the elevation of the source and of its target point Source parameters source elevation Target elevation 0 Roll angle 0 The angle the rotation of th
9. ars 5 0 12 0 Manual Redraw where you can have a perspective view of the model from any point of view GU introduction of this chapter 82 Draw2D Displays a plant view of the model Render View Options Hamsete View DARAMSETEISLUGCIA RAY File Edit View Map Blanking Surfer Help Hamsete View D RAMSETESSLUCIA RAY Euer Barren Lat ey MEAE NS 8 Focal lenght mm Em Here you can only change the focal length or panning the window using the horizontal or vertical scroll bars Launches the Render program described the next chapter G Render Opens a dialog box where you can select the entities to display or hide and their colors View Options v a lt Auto Redraw 1 View Room 51 View Sources 51 View Receivers 51 View BLH 51 View Axes EY Post Values 83 Auto Redraw View Room View Sources View Receivers View BLNS View Axes Post Values This check box toggles the status of the button on the right side of the main window In Auto Redraw mode all changes to the Focal length Camera Position and Target Point cause an immediate update of the screen otherwise you have to press Redraw each time you d like to take the picture Shows or hides the room geometry Shows or hides the sources Shows or hides the receivers Activates the blanking file if loaded Shows or hides the axes Displays the numeric value of the mapp
10. Version 1 2 by Genesis Model c ramsete slucia ray 16968 bytes free Pyramids 256 Hum 505 Time s Prec 0 0016 Hist 1 Time dependent Save hits 1 Save format 1 2 Source RAMSETE SOURCES omni spk 1 of 2 Pyramids Escaped Edges 16 0 Elapsed Estimated 00 00 31 00 08 16 Tracing Pod When the computation of a source has been completed the relative results will be saved in a file with an extension named after the letter associated to the source by Ramsete CAD A for the first source for the second and so on Pressing Cancel you ll abort the computation of the current and subsequent sources but the result files of the preceding ones won t be deleted LA Berore LAUNCHING A LONG ELABORATION GET SURE THAT ALL 5 SCREEN SAVERS ARE DISABLED THEY HOG THE CP U FOR A WORTHLESS TASK SLOWING DOWN THE PYRAMID TRACE UNACCEPTABLY F YOU HAVE TO WAIT MANY HOURS IT 5 MUCH BETTER TOTURN THE MONITOR OFF 67 9 Ramsete Graph This is the opening screen Ramsete Graph 1 0 File Edit Chart Table Window when you open a file with the standard Windows procedure you ll get this status window File ieee FE a Pyramid Precision e 0 01 Humidity 98000 History hits 1 Time dependent 0 i ne 2 The Alfa Beta constants are used for fine tuning the reverberation queue shouldn t changed You can directly edit them in the ramsete ini file b
11. shaped receivers When a receiver is contained into a cone it receives a energy intensity computed with the following formula o La a 1 L Ly 10 10 that s equivalent to the image sources formula With this approach we have another problem we can cover the entire sphere surface with circles without overlapping them at least partially Pure cone tracing has been improved with a statistical method in which the energy decreases like a Gaussian curve with the distance from the cone axis This is the algorithm adopted in Epidaure a program written by Vian Martin and Maercke Naylor in the Odeon package uses a cone tracing preprocessor for a image source method He removes duplicate sources by using the reflection tree of the overlapping cones This program can achieve better results than the former one adopting a nearly deterministic method Lewers is the first to successfully implement pyramid tracing so that radically solves the beam overlapping problem but loses the contributes of high order image sources He tried to solve this shortcoming superimposing a diffusive model to the deterministic pyramid tracing The biggest drawback of beam tracing is the incapacity to compute the reverberation queue precisely in fact as the cones grow larger a bigger number of image sources has been lost Let s try to explain it with the following example Pyramid axis cone or beam gt gt V gt gt
12. 0 lenght 2a width 2b 1 5 height c 2 Test Room Yolume 200 Freq Hz 315 631 125 250 500 1000 2000 4000 8000 16k e click on proceed button to accept all the inserted values e thedialog box will disappear now we should save our source data e click on menu item e click on the Save As item e save the file as proof spk in the machines directory e click on menu item e click on the Exit item to quit the program Now we can use Ramsete CAD to draw the factory s geometry remembering the following simple rules e Don t exceed in drawing particulars that are mostly irrelevant from the acoustic point of view but that can increase dramatically the computation times e Useasfew surfaces as possible e Dont place a receiver at less than 1 m far from the nearest source e Dont place a receiver at less than 10 cm from the nearest surface e Checkifall the edges are well closed matching to avoid undesired pyramid escapes Let s start drawing the floor e Execute Ramsete CAD by clicking on its icon from the Program Manager e Click on Lens icon and adjust the window scaling right clicking with the mouse until you can see an area of 24 x 16 m 28 Click on Floor icon Place the mouse cursor at position 0 00 16 00 0 00 and keep the left button pressed until you reach position 24 00 0 00 0 00 Input a 0 elevation for the floor in the
13. 90 41 89 5 88 58 826 06 75 85 83 Focal lenght mm jon 89 Do Contour 3D Do Contour 2D This command performs the same steps of the previous commands and outputs a perspective mapping of isolevel curves of the selected parameter Ramsete View 1 0 File Edit View Map Blanking Surfer Help Hamsete View D ARAMSETESSLUCIA m Focal lenght mm Camera Position Target Position ET 1 This command is similar to the previous but it displays bidimensional mapping like this Hamsete View 1 0 File Edit View Blanking Surfer Help Ramsete View D ATESIYRAMSETESARCHIVIDSSLUCIA Freg A SPL ig mr 7 92 9 2 jus 7 ma o Bic dee Focal lenght mm LN 6 h 90 10 5 Blanking Menu The blanking procedure defines the mapping area precisely in order to reach better graphical results also with a small number of grid subdivisions 477 Mapping Options 5 Clear Deletes the polygonal region from the screen Load Loads a previously saved blanking file with a BLN extension Load a Blanking File Home file Directory arman bin marzia bin gt ramsete sources slucia bin Tipo file ui SURFER s Blanking Files d 000 Add Line When you select this command you must insert the following value Blanking Flag Setting Select for Outer
14. Alt F4 This command quits the program 5 2 Edit menu H Cut Shift Del This command deletes the current selection and puts it into the clipboard You can recall it with the Paste command E Copy Ctrl Hns Copies into the clipboard one or more selected entities Paste Shift ns Pastes the previously copied entities from the clipboard D Duplicate Alt Hns This command is a shortcut for the combination of copy and paste commands Resize This command resizes the currently selected items It prompts you for a scaling factor that can range between 0 001 and 99999 Resize factor 37 B Info This commands displays the characteristics of the selected item if more than one entity has been selected it shows a dialog box for each item If you select a source its name and path would be displayed if you select a wall or any other surface you ll get a material dialog 5 Select All F2 Selects all the entities of the current model u Unselect All Shift F2 Unselects all selected items 5 3 Tools menu J Tools Displays or hides the Tools window 5 Pick This tools enables the selection of drawn entities in two different ways you can click on a single entity to select cyclically or deselect it otherwise you can keep the mouse button pressed and trace a rectangle around the group of entities you d like to select gt Lens You can center the model into the current view clicking the left mouse button while t
15. Artur el 12 00 0 00 0 Now we are ready to edit an old file or to input a new model The right side of the menu bar displays a Short description of the current drawing tool New This item let you create a new drawing if you are already editing a model you ll be asked to save the work done if you have modified it Open This command displays the common Open File dialog box prompting you for the next RAY file to load Home file Directory armani ray Ed armanil ray ramsete auxil ray sources clip ray Sola lettura demo ray Unita RCAD File stacvol 000 If you want to load a DXF file you should select this option from the listbox on the bottom left corner as uSual Save This command saves the current drawing if you haven t saved it yet you ll have to name it in the Save as dialog box described below 35 Save As Selecting this item you can open the common Save as dialog and give a name to your drawing You can select any disk or directory as a destination of your file The default extension is RAY Salva con nome Home file Directory d 3ramseteXmarzia ra d ramsete d E ramsete sources About This item displays some information on the application version and authors Ramsete CAD 1 0 2 Programming by 0 Guido Truffelli Beta Testing byi 0000 A Farina P Galaverna 36 u Exit
16. CAD File Edit Tools View AUXILIARY f In THIS VIEW THE Wa Door Winpow AND Hote TOOLS ARE DISABLED Grid Options You can define the snapping grid step with the following dialog box 46 With the bottom check boxes you can show or hide the grid itself or the X Y and Z axis Cascade Shift F5 This command places all the view in cascade B Tile Shift F4 This command tiles all open views filling the main window Standard This commands activates the four standard views of the model and tiles them on the screen Ramsete CAD File Edit Tools View Select the zoom area sv Ww 5 Redraw F2 This command will redraw the whole main window in order to remove undesired selection spots 47 6 Material Manager This program starts with the following window Material Manager 1 0 clicking Load Materials a new window will pop up Material Manager 1 0 Neszuno Tjintenaco calce s r 0 intonaco ruvido 3lintonacoliscio 0 01 4 calce fresco 0 01 5 calce maturo 0 01 6 lint calce degrad T R 0 03 0 02 8 gesso lisciato ferro 0 01 8 piastrelle stuccate 00 10 02 10 legno di pino C 005 11 legno verniciato g 10 06 0 06 T3 pavimento legno B 0 01 14 pavimento legno C 0 05 15 pavimento marmo B 0 01 18 pavimento moquette 0 03 Br il Here we can see the names of the mater
17. NEAREST SOURCE u Don PLACE RECEIVER EXACTLY ONTO WALL OR ANY OTHER SURFACE YOU SHOULD KEEP AT LEAST DISTANCE OF 1 0 CM A You CAN T DRAW HOLES IN THE AXONOMETRIC VIEW 43 5 4 View menu Plant This command activates the plant view of the model Ramsete CAD File Edit Tools View ES N THIS VIEW ALL THE TOOLS CAN BE USED H Front This command activates the front view of the model Hamsete CAD File Edit Tools View FRONT JE N THIS VIEW ALL THE TOOLS CAN BE USED 44 Side This command activates the side view of the model Hamsete CAD File Edit Tools View SIDE A N THIS VIEW ALL THE TOOLS CAN USED Axonometry This command activates the axonometric view of the model Ramsete CAD File Edit Tools View ASSONOMETRY 45 If you click the right mouse button inside this window you can define the axonometry type Assonometry Options Xangle Standard Y angle 30 0 Cavalier gt Monometric Isometric Dimetric gt Trimetric If you want define a customized axonometric view you should insert the desired values in the edit boxes otherwise you can select a standard axonometry with the radio buttons on the right LA N THIS VIEW YOU CAN USE THE P ICK AND Lens TOOL ONLY T He COORDINATES OF THE CURSOR ARE DISABLE D Auxiliary This command activates the auxiliary view of the model i e a view parallel with the selected wall Ramsete
18. Thanks to these features Ramsete can study the acoustic propagation in geometrically complex rooms with partial or total shields It allows also the computation of the noise emission towards receivers outside the room containing the source We can use this system in external environments where the distance between a fixed source and the receivers is not very long so that we can ignore atmospheric conditions 11 2 3 Versatility Versatility is one of the key points of the package it can be used inside industries were the sound pressure level is the main variable SPL can be computed in 10 octave bands 31 5 16 000 Hz keeping into account the room geometry the materials and their acoustic properties The noise generated by the machines can be simulated by sources freely placed of which we know the emitted power spectrum We can introduce shields or barriers in order to simulate the noise source encapsulation assigning a particular emission spectrum Each source emission is computed separately so that we can value the incidence of each one on the total level suggesting the source that needs a particular care in shielding process Inside an auditorium or a concert hall the most important variable elements other than the impulse response have been listed by many research groups in the last years and Ramsete can compute nearly all of them We can introduce omnidirectional and isofrequencial sources or real loudspeakers with a preci
19. standard Windows BMP file Do File Output This button creates the desired file Copy to Clpbrd Copies into the clipboard the current window 11 5 Help Menu Render Help This option loads the Render help file 5 About This command opens Ramsete View about box 99 12 Troubleshooting When you get a warning box telling you Hey you forgot to connect the dongle you probably forgot to connect the hardware protection key to your computer If you have properly connected the dongle and the problem still remains one of these assertions may be true The printer connected to the same parallel port is off There is a parallel cable without any printer at all on the other side The hardware protection or the parallel port are faulty 12 1 Ramsete Trace If Ramsete Trace presents some escaped rays please check carefully the geometric model in order to verify that it is well closed When Ramsete Trace can t find a sound source you have to verify that it s still placed in the same directory where Ramsete CAD found it In this case you have to edit the RAY file manually or put the source in the original directory If the computation times are longer than usual check the specified tracing parameters and have a look at the Turbo indicator of your machine 12 2 Ramsete Graph If L gt L the receiver is too near to a sound source less than 1 m If the program displays a sound pressure level that s half of
20. the expected value you should check the position of the source it could be exactly on a wall 12 3 Ramsete View For a correct mapping computation you should select the point as a decimal separator not the comma in the Windows Control Panel 101
21. views Rendering 2D and 3D mapping Sound levels and other indexes isochromatic or contours Impulse responses decay curves Ottave spectra reverberation times Sum of the impulse responses of many Sources The system includes a simple 3D CAD Ramsete CAD that features axonometric and orthogonal views of the room and can import export DXF files generated by AutoCAD Material Manager and Source Manager have a good internal data base that can be edited by the end user who can let enter new materials and sources with all their acoustic parameters that can be experimentally measured or automatically computed At the heart of the package there is Ramsete Trace that receives a Ramsete CAD model as input and computes the impulse responses for further processing This program is based on a pyramid tracing algorithm and geometric acoustics Ramsete Graph can post process these impulse responses and give a graphic or tabular view of the data For each one of the ten frequency bands and for each receiver it can display the impulse response linear and A weighted the SPL levels the Schroeder decay curve and the reverberation times EDT Tip Tig Tag etc 2 2 Ramsete View can display perspective views of the geometric models and it can and map the following data in two or three dimensions e SPL Sound Pressure Level e Direct Wave level e Reverberated field level e R D e Low e Co Klarheitsmass Dresda gro
22. 1 12 1 Ramsete Trace ee 101 12 2 Ramsete Graph na Nee 101 VENN 101 1 1 1 How to Legend Fite Menu Cut Shift Del read this manual This manual has been written also for people that are not skillful computer users For this reason we apologize to more skilled users for the frequent repetitions of the most simple Windows usage techniques Intropucinc Ramsete Shows the organization of the package and the basic algorithms used by its components Ramsete can be used nearly by everyone but you can t become a do it yourself acoustic engineer If you really desire to exploit every feature of the program you need a deep knowledge of its inner physical mathematic heart Knowns Ramsete briefly shows step by step the nine modules of the the package By this way the user can have a global view of the entire system Usinc Ramsete iS a practical example of a complete working session Ramsete IS the exhaustive list of all commands of every program of the package This section can be in its completeness or one paragraph at time as you need it Ramsete Materiais includes all the standard materials contained in Material Manager by default their description and acoustic properties Ramsete Sources contains all Source Manager s standard noise music sources Ramsete TroustesHootinc describes known bugs or obscure error conditions that could rise by using the program Select a menu item you ca
23. 15 509 7 6621 2 132 0 75910 41917 099 8 anbe co um e E 25 25 ca 20 spo Bum Ia 1 jaa 25 dn pur oo LFC This command displays the LFC table LC This command displays the LC table LE This command displays the Lateral Efficiency table 76 gt s he GR Ge CH Window Menu Cascade Tile Arrange cons Close All Will put all the open windows in a cascade Will fill the main window with all the current charts and tables Will align all the iconized windows at the bottom of the screen Will close all the active windows 77 10 Ramsete View This is the opening window Ramsete View 1 0 File Edit View Map Blanking Surfer Help Focal lenght mm Camera Position XY Z Target Position 72 Em s Let s describe the tools on the bottom line Focal Length This spin button contains the focal length of the imaginary camera you are using to take a picture of the geometric model Camera position It s the position in space of your camera Target position It s the point you are aiming at Redraw Updates the view takes the photo You can also turn your camera left or right side using the horizontal scroll bar on the contrary you can use the vertical scroll bar to move the camera up and down 10 1 File Me
24. GARN 18 36 Ramis ete VEN MM PH E 20 3 7 Preferences u ae 22 Shop PO 22 4 Using RAMSE E vvs 25 SM I II DM EE 34 ST FET NL Ne 35 2 zelus P M ee 37 5 3 NEA 38 5 4 VEN MENU a See eeo leende keen 44 o Material Manda 48 75 SOURCE Mana Heer 51 Elle Menu ke 52 PAPAR o AE e mme 59 MEN MEAN 59 TENNENE 62 WELL oD a Re 64 8 Ramsete TRAC muessen 65 lt ENG 69 9 T FE oe Dv TII M M MEE MEME IM I SUA 71 ZEMIN 73 9 3 Chart Mensa ern 73 9 4 Table Mental 75 9 5 MINdOW MIU T EA 77 TE Rarsete VER 78 TOL FIG 79 02 evt ee ER dei Ro Prod A eed 82 10 3 n 82 Me eee 85 10 5 Bl nkng ss 91 19 65 UFER MENE pe eee 93 93 Reese 94 11 FE MENU aa 95 11 2 MEN Mee Ao Se Ao denon ene 95 11 3 R E ME eee 97 11 4 O UEDUE MENE eee 99 Aep Men E 99 12 TROUBIES IO mde E e 10
25. Preliminary version RAMSETE Acoustic forecast software User manual Version 1 0 1 1 94 GENESIS Software and acoustic consulting This manual has been written by Paolo Galaverna with the collaboration of Marzia Giabbani and the supervision of Angelo Farina and transalted by Guido Truffelli Updated Wednesday May 31 1995 Windows and Excel are trade marks registered by MICROSOFT CORPORATION Surfer is a trade mark registered by GOLDEN SOFTWARE AutoCAD is a trade mark registered by AUTODESK INC Modeler is a trade mark registered by Bose CORPORATION Paint Shop is a trade mark registered by J ASC Inc THIS SOFTWARE IS PROTECTED BY INTERNATIONAL COPYRIGHT LAWS THIS MANUAL CAN T BE REPRODUCED BY NO MEANS WITHOUT THE AUTHOR S WRITTEN PERMISSION Summary YS Hl 1 Howto ead this NE S D 5 1 1 Legend E t 5 2 MOEN AEE 6 2912 FS se 4 2 2 Computation MENT rte E 8 VAGA pet 12 2 4 Required Hardware eis ed a T ER RE UV Nro ede M ME MD EU UM M UTEM I DH ME EE 12 3 RamsetedppliCdli fls NE 13 3 1 Ramisele CAD 14 3 2 Material Manager see Se eeo eee cu Ur 15 3 9 SOE Manager Hae 16 Rarrsete EEG ase NN 17 3 5 Ransete
26. a Response Geometry File This command opens the common Load file dialog box Load an Impulse Response File and its Geometry Home file Directory gt ramsete sources Tipo file Unit kapping Parameter Files d stacvol 000 Ramsete view can handle two different file formats Ramsete Trace ASCII text format or its binary format When you load a Ramsete Trace file it ll be saved in binary format in order to speed up any subsequent processing This command loads both the geometry and the impulse responses computed by Ramsete Trace in order to reach high quality graphic outputs such as perspective mappings of the room When loading process has finished you ll se the dialog box for the computation of the Speed Transmission Index 4 STI Options S TII Options Background Noise Mot Influent Present 81 Auto Print Screen This command prints the current window CE Printer Setup Will pop up the common printer setup window CE Exit Quits the program 10 2 Edit Menu Copy to Clpbrd This command copies the current window into the Windows clipboard 10 3 View Menu E Draw 3D When you load a geometric model you get a window like this one Hamsete View 1 0 File Edit View Blanking surfer Help Hamsete View DEXTESIXHAMSETEXAREHIVIDSSEUCIA Focal lenght mm Camera Position 7 Target Position AY 70 2 DU 80 0 40 0
27. bprogram of the Surfer package Activates the Topo subprogram of the Surfer package Activates the Plot subprogram of the Surfer package Activates the Plotter subprogram of the Surfer package 10 7 Help Menu Help About Opens the help file Displays some information about the program version and its authors Ramsete View 1 0 Programming by Angelo Farina Testing by P Galaverna 93 11 Render 11 1 File Menu B Exit Quits the program 11 2 View Menu Redraw This command redraws the entire screen 5 Set Lighting This command opens the following dialog box Lighting Lighting SEE SER NES Cancel where you can edit the RGB values of ambient light These values range from 0 0 0 black to 65535 65535 65535 white while the default values are 32767 32767 32767 gray The Level parameter represents the luminous intensity and can range form 0 0 to 1 0 The Lighting menu allows you to specify the parameters of four spot lights with the following dialog box Lighting Hed Green Blue Level gt T Shape Cancel Here you can also point the location and the target point of the spot source The Shape value can range from 0 to 1 and represents the concentration of the light beam 95 Set Camera Using this command you can set the camera parameters _ Lens It s the focal length Roll Angl
28. c H Test Hoom Volume Lp dB You can use conform surfaces with 8 microphones parallelepipedal surfaces with 5 or 9 microphones or hemispherical surfaces with 10 microphones All these parameters can be edited in tabular form and displayed in graphical form Source Manager 1 0 D RAMSETE SOURCES EV LONGHP EVHP9042 SPK v File Edit View Window Help Balloon Angle of plot 0 E Angle of plot 90 Polar Plot Frequency Source Manager can import MDL files generated by Modeler Bose Corporation 16 3 4 Ramsete Trace This program is the pyramid tracer the computation engine of the system Ramsete Trace 32 1 2 a Input File Level J TIGE Cancel Precision s 0 01 History hits 1 a Humidity 25 50 p Saved Hits 1 Save escaped rays Multi RAMSETE TRACE Version 1 2 by Genesis Model c ramsete slucia ray 16968 bytes free Pyramids 256 Hum 505 Time s Prec 0 001s Hist 1 Time dependent Save hits 1 Save format 1 2 Source RAMSETE SOURCES omni spk 1 of 2 Pyramids Escaped Edges 16 Elapsed Estimated 00 00 31 00 08 16 racing 17 3 5 Ramsete Graph This program displays in tabular or graphical form the results of the pyramid tracer such as impulse response in each receiver point or mean of the room Ramsete Graph 1 0 FABBR15 IR 31 5H2 R File Edit Chart Table Window B e 22222222
29. con 29 e Click on the middle of the wall e Input A and the dialog box with the door data e Select the Iron door material and press OK on the material dialog box Now we ll insert the source and the receivers e Click on the Source icon e Clickat position 23 00 15 00 0 00 and drag the pointer horizontally e Input 1 for the source elevation e Select proof spk for the source name e Click on the Receiver icon e Click on an imaginary grid with a 5m step to fill the floor with receiver e Input 1 7 for each receiver s elevation You should get the following situation on the Plant window Before leaving Ramsete CAD save the file as proof ray using the common Save File dialog If you want to import an AutoCAD DXF file you should follow these advice 1 Surfaces Use 3DFACE entities place them in a layer with the same number of the face material Obstructing faces will have a number increased by 1000 2 Doors and Windows Use 3DPOLY entities placed on the layer corresponding to the material 3 Holes Use 3DPOLY entities placed on the HOLES layer 4 Sources Use the ATTDEF entity on the SOURCES layer giving a tag that identifies the file with the source data i e C RAMSETE SOURCES OMNI SPK Use the two point curve fitting to specify the position and orientation of the source 4 Receivers Place LINE entities on the RECEIVERS layer to specify their positions and orientati
30. d above the only variation is the number of required parameters Auto Print Screen This command prints the current window Printer Setup This item allows you to select and set the current Windows printer Exit This command exits the program 58 W N Im d Cut Copy Paste Delete t Menu This command puts in the clipboard the current selection and deletes it This command puts into the clipboard the current selection This command pastes in the current position the contents of the clipboard This command deletes the current selection View Menu Balloon This command displays the following window Balloon Frequency that shows the directivity balloon for the frequency selected in the listbox When you can t see any balloon the corresponding frequency has no power emission 59 Curves 2 This command shows the following situation Polar Plot Frequency Frequency Band Angle of plot 0 where the horizontal and vertical radiation diagram of the specified frequency are displayed Curves All This command fills the main window in this way Source Manager 1 0 DYRAMSETEYSQOURCESAEYAL ONGHPAEVHPSD A4 amp SPK Edit View Window Help These 18 windows show the planar radiation diagrams of the selected frequency with planes rotated with a step of 10 with respect to the horizontal plane 60 Header Selecting this command you ll get the following dialog box
31. dialog box and press the OK button Select the Concrete floor g from the material dialog box and press the OK button Now we are going to draw the walls Click on Wall Icon Click on the origin 0 0 0 Drag the pointer to 0 00 16 00 0 00 and release the mouse button Input 0 and 6 in the elevation dialog box and press OK Choose Rough cast from the materials dialog box and press Repeat the preceding steps for the other walls following these coordinates 0 00 16 00 0 00 16 00 24 00 0 00 24 00 16 00 0 00 24 00 0 00 0 00 0 00 0 00 0 00 Now we are going to draw the roof Click on Roof icon Click on position 0 00 16 00 0 00 and drag the pointer to 2 00 0 00 0 00 Input 5 in the first elevation dialog box and click OK Input 6 in the second elevation dialog box and click OK Input 6 in the third elevation dialog box and click OK Choose Rough cast from the materials dialog box and press Repeat the same steps for the other three parts of the roof At last we ll draw the windows and the main door Click on the Pick icon Select one of the walls Click on the Window icon Click on the middle of the wall Input 22 1 3 in the dialog box with the window data Select the Glass g material and press OK the material dialog box Repeat the same steps for the other wall And now the main door Click on the Pick icon Click on the Door i
32. e It s the angle of rotation of the camera with respect to the ground 0 0 for landscape 90 0 for portrait From It s the camera position To It s the target point Set Back Color Allows you to specify the background color Colori Colon di base Ie Colon personalizzati meme 1 A Definisc colon personalizzati This dialog has been described in the View Options command 6 View Options 96 11 3 Rendering Menu Wireframe Shows wireframe representation of the model Hender File View Rendering Output Help Hm rami n re M E x l FT ETT ELI wr C1 Painter Render This option shows flat shade of the geometry using painter algorithm Hender View Rendering Output Help 97 ZPoly Render This option computes also different color shades inside the same face Hender File View Rendering Output Help ZBuffer Render This algorithm is much slower but gives more realistic results Hender Eile View Rendering Output Help Em 98 11 4 Output Menu File Name Saves a file containing the current displayed image select Output File Name Home file Directory E ramsete sources Tipo file File 4 stacvol 000 Metafile Winword APM Selects APM Metafile Bitmap Pbrush BMP Selects a
33. e noise SPL for each band in the next dialog box 87 S TI Options Background Noise C Not Influent Present Level of Background Noise Freg Hz 125 250 500 1000 2000 4000 8000 t 00 00 00 00 00 Equalize for Standard Voice Spectrum YES C NU Force Reference 60 dB A SPL at 1m YES ONO RGB Options This commands allows you to specify one by one the colors used for the gradient mapping RGB Settings vi If you click onto a colored box you ll be prompted with the color selection dialog box View Options 88 Do Dither This command shows the Mapping options dialog box Mapping Options and starts the Surfer program When you can hear a beep you realize that the program has finished its computation and you will see a perspective mapping of the selected parameter using all options specified with the View options and Mapping options dialog boxes Ramsete View 1 0 Edit View Map Blanking Surfer Help Ramsete View D ATESISNAAMSE TESARCHIVIOSSLUCIA _ Focal lenght mm Camera Position EY Target Position Ar ium Do Dither 2D This command is very similar to the former one in usage obviously you ll get a bidimensional mapping of the selected parameter Ramsete View 1 0 Edit View Map Blanking Surfer Help ae Ramsete View D ATESINAAMSETESAARCHIVIONSLUCIA _ Freg A SPL 99 57 38 55 97 74 96 82 95 91 94 99 94 08 93 16 92 24 91 33
34. e source axis with respect for the floor plane plane At last you ve to define the full path of the source parameters file in the common open dialog 42 354 Home file Directory E gt ramsete sources Sola lettura Tipo file Noise Sound Source File d stacvol 000 When you press OK the screen should look like this where the letter is a progressive identifier for the source jen Don T PLACE A SOURCE EXACTLY ONTO A WALL OR ANY OTHER SURFACE YOU SHOULD KEEP AT LEAST 10 CM OF DISTANCE You CAN T DRAW HOLES IN THE AXONOMETRIC VIEW Receiver A receiver represents a microphone any measure equipment or a person The tracer results will always be relative to the receiver s position they shouldn t be considered the mean value of the room so you should use more than a receiver in order to analyze a room properly The more receiver you place the more precise results you get but remember that the resulting file will be much larger and the computation times longer You can place a receiver with the same steps described for a source but you ll be asked for the receiver elevation only because the target point is always at the same height This piece of information is fundamental for the computation of LE parameter Each receiver will be automatically identified by a progressive number LA Don PLACE SOURCE EXACTLY ONTO SOURCE YOU SHOULD KEEP AT LEAST 1 M OF DISTANCE FROM THE
35. ed parameter close to each receiver If you click on the colored region of each option you can choose the color of the corresponding entity with this dialog box Colon di base Men mjm ER EN E ES 1 pnl dr Colon personalizzati A 1 ee LJ E E Definisci colon personalizzati If you want to define a custom color you can press the proper button and open the common color selection dialog Colori Colori di base See men EN 1 ol Jam Ge 1 EN nna RR zZ ES EET I RI ERI Colon personalizzati E Tonalit 132 Rosso L JL TE TESS Saturazione Colore Tinta ph rs Luminosit Aggiungi ai colon personalizzati 84 10 4 Map Menu Load response file Opens the common open file dialog box Load an Impulse Response File Home file Directory ramsete sources Tipo file Unita kapping Parameter Files d 000 Here you can select an impulse response without the corresponding geometry 4 Open Response Geometry File When the loading process has been completed you ll se the dialog box for the computation of the Speed Transmission Index G STI Options STi Options Background Noise Mot Influent Present a Mapping Options Allows you to specify all mapping options in this dialog bo
36. f the tools window VW 5 00 You can insert sources and receivers all with their orientation This is very important for directive sources and for Lateral Efficiency computation Geometric model are saved in a human readable RAY format or in DXF format readable by AutoCAD 3 2 Material Manager This program has a spreadsheet like interface where you can enter the acoustic properties of your materials You can display and edit the following parameters for each frequency band absorbing coefficient phonoinsulating power in dB Material pem 0 N Frequency Hz Nessuno 1 Jintonaco calce s r intonaco ruvido 3 intonaco liscio lint calce fresco calce maturo T R int calce degrad T H int gesso lisciato legno P 8 gessolisciatofero 9 piastrelle stuccate g 10 legnodipino C 10 11 legno verniciato 9 10 0 01 14 pavimento legno Cl 0005 15 pavimento marmo 1001 16 pavimento moquette 1003 0 03 18 pavimento gomma 100 14 Inavimento linoleum m 1 0 15 3 3 Source Manager This application can generate or display SPK files that contain all sound source data With the ISO 3744 3746 module you can input directly the sound level of a sound noise source experimentally measured ISO 3744 3746 1 0 OK proceed Load from File Display Lw Print Window lenght 2a width 2b 15 height
37. have selected Loudspeaker you ll be asked for the electric power in Watt The program will distribute the energy for each band automatically Now you can press OK an save the work with the Save as menu item u Source ISO 3744 If you know the sound pressure level according to the ISO 3744 3746 standard you can describe a source with the following dialog box ISO 3744 3746 1 0 Humber of Microphones OK proceed _ Load from File Save to File Display Lw TUM irre 1 lenght 2 width 2b 1 5 height c Test Room Volume Freq Hz 315 63 125 250 500 1000 2000 4000 8000 16k Lp i dB 00 00 00 00 00 00 00 00 0 Lee dB You must insert the power levels for each band in dB the dimensions of the parallelepipedal surface in meters and the room volume where the measures were taken When you re done click on the OK button to see the next dialog box 54 Enter Heading Data Source Name _ Y Manufacturer OK proceed where you can specify the source name and manufacturer If you select the Load from file item you can load DAT or PRN files with this dialog box Load an 150 3744 file Home file Directory d ramsete sources p dat dA paolo dat gt ramsete sources altec C bose ev Tipo file Measurement Result Files dat d stacvol 000 Save to File button will show the com
38. have to define the circumference arc of its base clicking onto three points to define the arc itself limits If you want to draw a complete circle you should click onto two points defining the diameter and click on the first point again to finish At this point you ll have to insert the cylinder elevations in the following dialog box Input Elevations LA Au COORDINATES CAN BE NEGATIVE For computation efficiency purposes all circular surfaces are approximated to a number of rectangles you can specify this number in this dialog box At last the material dialog box will appear GW Floor EN You CAN DRAW A ROOF IN THE AXONOMETRIC VIEW 40 oe Sphere The procedure that defines a spherical surface is identical to the one we have described for the cylinder c Cylinder This tool can t draw a complete sphere but only a fraction of it but you can draw a semi sphere and use the mirror tool in order to have the work done oue Door When you want to draw a door you have to select the wall that it belongs to and click on the position in which you want to place it Now you have to specify the door dimensions in the following dialog box Door size Heigth m A The SELECTED POINT IS THE MIDDLE OF THE DOOR BASE At last the material box will appear nas You CAN DUPLICATE OR MIRROR DOORS WITHOUT SELE CTING THEIR WALL A You CAN T DRAW DOORS IN THE AXONOMETRIC VIEW om
39. he assumption that the number of impact on a receiver in the time unit n t can be mathematically described by the following relation according to Maercke Martin lem N 2 4 T c9 ad 4 T co a ae ee nn l e V V 2 The theoretical behavior of this curve is represented by the first factor of the above relation ignoring the bracketed term thus it grows with the square of the time As far as the variable t reaches infinity the relation 2 gives the number of impact into the time unit 2 3 4p In the two formulas above there are two parameters that depend the acoustic field nature the minimum free path or that Ramsete computes following the axis of each pyramid and the adimensional coefficient that depends on sabinian properties of the acoustic field in a perfectly diffused field we have 0 3 The critical time that appears in the relation 2 represents ideal separation point between the first half of the acoustic queue in which all image sources are correctly found and the second half in which we have a constant energy addition per time unit The following picture shows the comparison between real situation and theoretical assumptions 190 Reflections ms 50 80 4 Theoretical curve 70 Critical time 60 Real curve 50 m y li i UM al M E NT KIT 10 aen 20 Maercke Martin theory 600 Time ms The correctio
40. he right button reduces its size If you keep the button pressed you can zoom into the selected rectangular area Move This command allows you to define a vector along which the current selection will be moved In oredr to move one or more entities you should select them with the pick tool then you need to click on the starting point and release the mouse button upon the destination This command is mostly used in conjunction with the duplicate command jen Tus COMMAND IS NOT AVAILABLE IN THE AXON OMETRY VIEW Mirror This commands mirrors the selected entities with respect to a segment that can be drawn in the same way of the move command Z Move A dialog box will ask you if you want to delete the selected items after mirroring or duplicate them CONFIRM Q Delete old objects I Tus COMMAND IS NOT AVAILABLE IN THE AXON OMETRY VIEW 38 all CB os Floor This tools allows you to draw rectangular surfaces clicking on a corner and dragging the pointer to the Wall opposite one When you release the mouse button you ll be required the floor elevation in the plant view Coord 2 a You CAN INPUT NEGATIVE COORDINATES TOO After that you ll prompted for the floor material Input Material Surface type intonaco calce s r Obstructing face The listbox contains all possible materials for any surface you can select them with the arrow keys pressing the material initial le
41. ials and their coefficient Qr for each octave This window can be resized using the standard Windows procedures 49 Absorbing factor Pressing this button every absorbing factors of each band will be displayed R Phonoinsulating coefficient Pressing this button the coefficients of each band will be displayed Update File Saves the work done until this moment Quit Exits the program with the following dialog box Really Do You Want to Exit If you want to insert a new material you should position the cursor on an empty line and press the left arrow lt 4 Then you ll insert the material name and all of its parameters 50 7 Source Manager 7 1 File Menu E New Creates a new source data file Open This command opens the common open dialog Open a Source File Home file Directory d ramsete sources 1 punto spk Annulla alto spk alto45 spk ramsete macchina spk F sources omni spk 1 altec paolo spk bose prova spk ev sinistro spk jbl Tipo file RayCad Speaker Files spk d stacyol 000 where you can load any SPK file previously generated by Source Manager Save This item saves the work done if you haven t saved it before you ll prompted for a new file name with the Save As dialog box E Save As This command allows you to save the file with a given name pe Save a Source File Mame file Directory d ramsete source
42. it View Map Blanking Surfer Help mmm Ramsete View D ATESINRAMSETESNARCHIVIDSSLUCIA Freq A SPL 39 57 38 55 97 74 96 82 35 31 34 33 34 08 93 16 92 24 91 33 90 41 89 5 88 58 87 67 85 75 85 83 Focal lenght mm o p h or three dimensions 20 Ramsete View 1 0 Edit View Map Blanking Surfer Help Ramsete View D ATESINRAMSETESNARCHIVIOSSLUGCIA Focal lenght mm Camera Position EY Target Position XY imd You can map isolevel curves in two or three dimensions Hamsete View 1 0 Edit View Map Blanking Surfer Help Hamsete View D A TESINRAMSETESARCHIVIOSNSLUCIA Freg A SPL Focal lenght mm 9 h 21 You can choose between many rendering effects so you can create professional looking presentation without any complex dedicated software Render File View Rendering Output Help 3 7 Preferences Using the notepad Windows applet you can edit the default parameters of Ramsete Blocco note RAMSETE INI File Cerca 7 License User Paolo Galaverna Parameters Leuel Se Time 18 Frecision 0 01 s History 1 Time dependent Humidity Alfa 3 8 Paint Shop Pro This a very powerful shareware program that let you capture edit and print any kind of image with the desired color depth 22 Norton Desktop File Disk Tree View Configure Tools Window Help Zh d pum
43. m it to other data files in this case we suggest to rename it using the Windows File Manager as usual Print Will send to the printer the current window About Will show some information about the program and its authors Programming by o Truffelli A Farina P Galaverna 12 u Exit Quits the program 9 2 Edit Menu Copy Put in the clipboard the contents of the current window in text form so that you can paste them into any spreadsheet application such as Microsoft Excel or Borland Quattro Pro 9 3 Chart Menu Impulse Response This command displays the impulse response at specified frequency of the current receiver Ramsete Graph 1 0 FABBR15 18 31 5 2 R gt File Edit Chart Table Window B e EN EE EEE 120 110 100 90 80 You can click anywhere in the window in order to move cursor represented vertical line and display in the bottom left corner the level in that precise point You can move the cursor using the arrow keys too If you keep the mouse button pressed you can draw a rectangular area and zoom the graphical representation of the curve If you want to come back to the normal scale you have to press the right mouse button 73 Schroeder This item will show the backward integration of the impulse response using a method developed by Schroeder Ramsete Graph 1 0 FABBR15 A SCH 31 5Hz R
44. mon Save dialog box Save an 150 3744 file Home file Directory gt ramsete sources FE altec bose FE ev Salva il file con formato Measurement Data Files E d 000 55 Clicking the Display Lw you can see the power level spectrum for each octave linear and A weighted of the source you ve just created 18037443746 oI Humber of Microphones ok poceed _Lead fom Fie Load from File Lw Sound Power Levels SaveteFi e lenght 2a width 2b 1 5 height c Test Hoom Volume alt 2000 9000 zul 1000 16000 Lp 1 dB 1 65 4 549 56 7 Lp 2 dB 76 5 892 453 Lp 3 dB 1 876 894 768 Lp 4 dB 1 0 5 64 6 764 Lp 5 dB 47 6 85 6 947 Lp b dB 2 56 6 946 855 Lp dB 4 66 7 65 4 985 8 dB 9f 99 4 86 6 876 RT s 3 40 39 328 Obviously Print Window will dump the window to the current printer There are also other methods to specify a source parallelepipedal surface with 5 microphones conformal surface with 8 microphones and hemispherical surface with 10 microphones 56 surface 6 mics Contormal m T par 2 E m cL radius r Hemispherical Surface 10 mics In all these cases you can follow the same procedure describe
45. n activate it by clicking on it with the left mouse button otherwise you can press the Alt key followed by F without releasing it Select a menu command you can select a command from a menu clicking on the desired item or by pressing the underlined letter of its name usually the first one You can also use the arrow keys to move onto a command and press Enter to select it Using a short cut if you can see a key combination on the right of a menu command you can recall it simply by pressing the displayed keys there s no need to open the corresponding menu See also Warning 2 Introducing Ramsete 2 1 Features Ramsete is an advanced software package for the acoustic phenomena simulation Thanks to its powerful features it can be used to study concert halls auditoriums and theaters or industrial acoustic treatments and external noise sources It is a modular system that can be easily updated and used even by non professionals This program has been developed for the Windows operating system so we ve obtained an advanced user interface a fast learning curve a full integration with the most popular PC working environment The system is composed by many modules connected in the following way Power Measures ISO 3744 data base Directivity Measures speakers LwQo Material Proof bacc certificates Ro Geometry File RAY Impulse Responses File Post Processors Perspective
46. n of the reverberating queue is computed by dividing the sound energy by the bracketed term of equation 2 that s always less than 1 and decreases with time t linearly In practice the estimate of the t parameter is tied to proper value of the b coefficient that minimizes the difference between the exact curve and the estimated one When we have found a good value for can Safely trace as few as 256 pyramids without any significant precision loss 10 The following graph compares the energetic impulse responses obtained with an high number of pyramids 128 000 and a small number 256 of them with two different queue correction coefficients 8 03 and 0 80 0 05 O 1 0 15 0 2 0 25 0 3 0 35 0 4 Tempo s 256 non corr 256 Corretta We can see that in a non sabinian room the queue correction can obtain very good results with a small computational effort a couple of minutes In Ramsete we have the possibility of declaring some surfaces as obstructing in order to give the system the chance to compute the energy faction that passes through some faces and hits receivers on the other side or diffracts along their free edges This energy is computed with the Keller Maekawa formula 2 7 NI Lig L 5 l0 log 4 a tanh 42 m N where L FA is the direct level assuming no obstructing face between the source and the receiver and N is the Fresnel number i e N
47. nu Open Geometry File This command opens the common Open file dialog box Load a Ramsete CAD File Home file Directory d yramsete armani ray armanil Ez ramsete auxil ray barrierl ray sources clip ray demo ray Tipo file Read Geometry Files _ray 79 Here you can select any Ramsete CAD file in order to display it without computing any acoustic parameter Save Geometry File This command opens the common Save file dialog box Save Hamsete CAD File Home file Directory E gt ramsete sources Salva il file con formato Unit Read Geometry Files EE d stacwol 000 This option can be used to save geometric models in RAY format when they have been loaded from DXF file DXF In This command imports DXF files so that you can convert them in RAY files with the previous command Load an AutoCAD DAF File Home file Directory ramsete sources Tipo file Drawing Exchange Files DAF d stacwol 000 80 u DXF Out This option can be used to save geometric models in DXF format when they have been loaded from a RAY file Save DXF AutoCAD File Home file Directory d 4 ramsete marzia dxf d ramsete gt d E gt ramsete sources 22 Salva il file con formato Unita Drawing Exchange Files dxf E d stacyol 000 Annull
48. on 30 By now we ve completed the data insertion phase Now we re ready to process these data with Ramsete Trace e Click on Ramsete Trace icon e Load the file proof ray with the common Open File dialog box e the following parameters e Level 5 e Time 6 e Precision 0 01 e History 1 e Humidity 65 e Press OK to proceed with the computation Now we ll analyze the processed data with Ramsete Graph and Ramsete View e Click on Ramsete Graph icon e Load proof a with the common Load dialog box e Select T60 from the Table menu item e Let s compare the reverberation times with the ones measured on site Measured merum Ramsete proof aa oe nr E a Biss 11 827 10 597 8 741 7 767 6 959 6 900 5 269 2 088 0 611 We can see that there s a little difference between the experimental and simulated times so we can be really sure that we have built agood geometric model Now we ll map the SPL of the factory using Ramsete View e Click on Ramsete View icon e Select Open Response Geometry File from the File menu e Load the proof e Press OK done on the STI Options dialog box e Usethe View Menu in order to select the items that you want to be displayed or not 31 e Select Mapping Options from menu item e Check Use SurferTMs Grid box and press OK e Select Do Contour 2D command and press
49. on the options dialog Hamsete View D YRAMSETENPROYAT Freq SPL Now we ll use Ramsete CAD to edit the original model in order to reduce the SPL e Followthe standard procedure to load proof ray in Ramsete CAD e Click on the Wall icon and draw wall from 21 00 16 00 0 00 to 21 00 13 00 0 00 with height of 3 m e Select Intonaco calce s r from the material dialog and remember to check the Obstructing box in fact the new wall is inserted between the source and the receivers e Savethe modified model as progect ray and exit the program e Now you should repeat the same operating cycle we described before in order to compute progect a with Ramsete Trace and display the T60 table with Ramsete Graph Ramsete proof 11 827 10 597 8 741 7 767 6 959 6 900 5 269 2 088 0 611 Ramsete Progect PP prm 8 731 7 829 17 040 6 908 5 214 2 049 0 608 32 As we could expect the reverberation time isn t changed very much Now we ll use Ramsete View to map the SPL following the above mentioned procedure Hamsete View D ARAMSETENPROGECT A SPL IMPORTANT This is a pure didactic example and the author declines every responsibility on the improper use of the acoustic data in real projects 33 5 Ramsete CAD The opening window will look like this Ramsete CAD File Edit Tools Yiew Select entities
50. oon subdivision the number of pyramids will be 8 2 where N is our inserted value It s the duration of the tracer analysis it should be as near as possible to the reverberation time in seconds Is the width of each sample of the impulse response It can assume any positive value but normally it ranges from 0 001 theaters to 0 1 factories Is the number of reflections before a pyramid is ignored a zero value instructs the program to compute the direct wave only a negative value tells the tracer to ignore this parameter and to follow the pyramids on a time basis It s the relative air humidity The default value is 80 Tue Lever Time ano History VALUES HEAVILY INFLUENCE THE COMPUTATION TIMES Level EXPONENTIALLY Time LINEARLY e History unear v WE HAVE ALREADY STATED THAT THE COMPUTATION TIME IS STRONGLY TIED UP TO THE NUMBER OF SURFACES IN THE GEOMETRIC MODEL ANDTHE NUMBER OF SOURCES AND RECEIVERS LA THE Time AND P RECISION PARAMETERS THE NUMBER OF RECEIVERS INFLUENCES LINEARLY THE DIMENSION OF THE RESULTS FILE 66 Save This button save the current values and uses them as a default in the next working session Cancel Will exit the program About Will display the following about box Ramsete Trace 1 0 ed Programming by 3 Truffelli Testing by A Farina P Galaverna During the tracing process the following status window will be displayed RAMSETE TRACE
51. p pe 1 Balloon Frequency 62 5 Tile Shift F5 This command fills the main window with all the active child windows as usual in Windows environment Source Manager 1 0 D RAMSETE SOURCES EV LONGHP EVHP9042 SPK File Edit View Window Help info Angle of plot 0 Angle of plot 90 Pointed Datum Freg 116 Power Level dB Sensitivity Tw Im 0 Electr Impedance Speaker Mame Manufacturer 1st frequency band Last frequency band 4000 Close Arrange Icons Arranges all the iconized windows at the bottom of the main window Iconize All Iconizes all open windows Deiconize Inverts the effect of the previous command Close All This command closes all the active windows ddp Gi fag Gir Clear Screen Clears all the screen from previous messages 63 Help Menu Index About This commands displays the help index Displays the window containing information on the program and its authors Source Manager 1 0 Programming by RETE Testing by P Galaverna 64 8 Ramsete Trace Level Time Precision History Humidity This program starts with the following dialog box Ramsete Trace 3 1 2 a Level 5 Dee Cancel Precision s 0 01 History hits 1 Humidity 25 50 Saved Hits 1 Save escaped rays Multi It s the level of source ball
52. passed to the Surfer program that computes the mapping of the parameters The higher they are the nicer the mapping will look like but you can t exceed the limits of available DOS memory 86 Dresda Group Dresda Group Cremer Kurer Ando Houtgast amp C J ordan Beranek 3D Z value Defines Z coordinate of the perspective mapping plane 4 Do Dither 3D This value should be equal to the height of the receivers normally 1 7 m Increment It s the step between two isolevel curves Use Surfer If you purchased Surfer you can also check this box otherwise you have to use a simpler mapping procedure Max Radius The research radius of this latter algorithm can be specified in this edit box Use Blanking file This checkbox let you use a blanking file if you want to use the Surfer program e Blanking menu the file name can be specified in the following dialog box Load a Blanking File Home file Directory arman bin dt marzia bln E ramsete sources lucia bin Tipo file SURFER s Blanking Files d stacwol 000 View Options Recalls the view options dialog 437 View Options STI Options When you load an impulse response file you ll always see this dialog box S TI Options Background Noise Not Influent Present where you are asked if the background noise can be ignored or not If you click on the Present radio button you need to specify th
53. pe surface with five measure points The machinery dimensions are width 2 m length 2 m height 4 m The pressure level and the reverberation time Too temperature 20 humidity 65 are Frequency PP Lp l 92 50 91 00 96 40 97430 95420 192550 94 601 90 40 190 20 090550 Lp 2 98 90 99 70 94 50 96 60 97 40 92 40 91 50 93 50 93 50 92 90 Lp 3 85 80 88 30 85 60 82 40 85 40 866 40 85 60 82 30 84 30 85 20 Lp 4 77 30 76 90 73 40 79 40 76 860 75 60 76 40 74 40 72 30 11 30 Lp 5 66 30 68 90 63 90 70 40 72 10 65 40 62 60 64 60 66 40 61 90 RevTime Lt kh te be de pr The factory volume is 2112 m 26 The floor is made of concrete the walls and the roof are made of rough cast the main door is made of iron Now we can create our noise source following these steps e click on Source Manager s icon e click on File menu item e click on the Crate Source ISO 3744 item Now a dialog box will pop up to let us doing the following operations e Select the number of microphones 5 from the corresponding list box Input length 2 m width 2 m and height 4 m in the proper edit boxes Input the factory volume in the corresponding edit box 2112 m e Fill the first five lines of the spreadsheet with the sound pressure of each frequency band e Fillthelast line with the reverberation times of each band Now the dialog box should look like this 27 150 3744 3746 1
54. s d ramsete sources altec 1 bose Sola lettura C C ibl Salva il file con Formato Unita RayCad Speaker Files spk d stacyol 000 52 Import This command imports Modeler 3 0 or Modeler 3 1 speaker files Import a Speaker File Home file Directory Tpunto spk alto spk alto45 spk _ ramsete macchina spk ES sources omni spk C altec p dat bose paolo dat ev spk Tipo file Modeler 3 1 Files 7 d stacyol 000 Source BZ This item will pop up the following dialog box Source Manager 1 0 File Edit View Window Help New File Creation Sound Source Type Noise Source 1 Loudspeaker os Select the proper B function number for each active frequency band 31 5 63 125 250 500 1000 2000 4000 8000 16000 ie These BZ curves describe the directivity of a source You should specify if you want to create a sound or noise source with the Sound source type radio button Now you have to select aBZ curve for each band BZ1 BZ2 BZ10 44 n You CAN ASSIGN A 0 POWER VALUE ONLY TO THE FIRST BANDS OR TO THE LAST ONES You CAN T LEAVE POWER HOLES OTHERWISE THE PROGRAM WILL CRASH 53 If you have selected a Noise Source you ll see this dialog box Introduce Power Data Sound Power Level LIH dE where you can specify the linear power level in dB of the source If you
55. se frequency response and spatial dispersion 2 4 Required Hardware The minimal required hardware is a 80386 processor better if coupled with a 80387 math coprocessor Ramsete is an intensive CPU user and it works better on faster machines 486 or Pentium but has not excessive RAM requirements 4 Mb will suffice but we all know that Windows can be used productively starting from 8 Mb You need at least a 20Mb of hard disk space in order to set up Ramsete and run a simple working session A good sound card is optional 12 3 Ramsete applications The Ramsete package is composed by the following programs e Ramsete CAD e Material Manager e Source Manager e Ramsete Trace e Ramsete Graph e Ramsete View e Preferences e Paint shop pro Ramsete 1 2 TS gt 4 Acad Fi32 Fgraph Bwiew Fref 3 1 Ramsete CAD This program is a real 3D CAD system that can import DXF files generated by AutoCAD You can work on many views at the same time plant sections and axonometry This is an example of a typical Ramsete CAD screen Ramsete CAD vis File Edit Tools View Select the zoom area I rw TV AI 14 00 3 00 0 00 LE 0o RONT 14 There s a floating toolbar that allows the selection of all the main geometric entities floor wall roof door window The current cursor position is always displayed in the bottom line o
56. tter repeatedly or directly with the mouse If the surface hides other surfaces or receivers remember to declare it as obstructing clicking the checkbox This procedure is the same for any surface entity floor wall roof Obstructing face A A WALL IS OBSTRUCTING IF IT CAN BE POSITIONED BETWEEN AN IMAGE SOURCE AND A RECEIVER NUMBER OBSTRUCTING FACES SHOULD BE KEPT AS SMALL AS POSSIBLE IN FACT INFLUENCES HARD THE COMPUTATION TIMES LA You CAN T DRAW FLOORS IN THE AXONOMETRIC VIEW In the plant view you can draw a wall as a segment G_ Move in the front or side views you ll draw a rectangle G Pick Lens When you ve placed the segment you ll be asked for the minimum and maximum elevation of the wall Input Elevations Max 3 AA Au COORDINATES CAN BE NEGATIVE In the side or front view you ll be prompted for the missing coordinate only with the standard dialog box 4 Floor LA You CAN T DRAW WALLS IN THE AXONOMETRIC VIEW 39 p Roof The procedure to draw a roof is very similar to the one used for the floor G Floor but when you ve drawn the rectangle you ll be prompted for the elevations of three points the fourth we ll be computed automatically Coord 2 LA You CAN INPUT A NEGATIVE COORDINATE The procedure will end with the standard material dialog box G Floor LA You CAN T DRAW A ROOF IN THE AXONOMETRIC VIEW 9e Cylinder In order to draw a cylinder you
57. up e E ao Klarheitsmass Dresda group e Toss Barycentric Time Cremer K rer e S Equivalent Reflection Amplitude Ando e STI Speech Transmission Index Houtgast amp C e RASTI e LE Lateral Efficiency Jordan e A2 e ITDG Initial Time Delay Gap Beranek In the last release has been added the possibility of anechoic music convolution with the impulse response The customer may ask for personalized program versions in order to solve specific problems Computation Method We chose pyramid tracing because it guarantees the following benefits e short computation times e high resolution of the impulse response e precise receivers positioning modeled as points not spheres The beam tracing i e the modelling of the spherical sound waves through beams of various shapes is a natural evolution ray tracing The simplest way to obtain a beam tracing is to implement a normal ray tracing with spherical receivers whose radius grows as the square of the ray length In this way we can keep constant the quotient between the sphere s maximum circle an the global surface hit by the rays reducing the minimum number or rays to compute But there is a big drawback with this approach the receiver keeps getting bigger and bigger growing well past the room dimensions thus it could receive energy even from rays on the other side of a wall or outside the room A much better way to achieve the same effect is to trace diverging rays or cones and to use point
58. ut we don t recommend that on the contrary we suggest to use more than 8 subdivisions in Ramsete Trace When you press OK you get a toolbar similar to this one In the first row you can see the list of the receivers and their mean labeled as R that stands for room data The room receiver has not a real position in space so it has only a symbolic meaning not deterministic like other receivers In the second buttons row you can see all frequency bands and their linear and weighted A sum When you open the impulse response window you ll get the information about the currently selected receiver and frequency 70 9 1 File Menu Open This command allows you to select file generated by Ramsete Trace and load it File Open Filename Directory d ramsete Cancel Files Directories armani d marzia a sources Sum This commands allows the selection of more than one file generated by the same geometric model but from different sources The first step consists of the selection of any data file in order to specify the name of the model File Open Directory d ramsete Files Directores In the second phase you should select the sources you want to add together 71 SUM FILES Available Selected slucia slucia B When you have done the selection a new file with extension will be created Later you can load this file alone or to su
59. x Mapping Options Increment C Use Surfer TMJ s Grid Parameter Actual Frequency Color Scheme Hin Level dH Max Level dB ive a Hianing 4 View Options Ho x divisions Ho Y divisions Max Hadius m 3D value m Cancel Parameter This list box selects the parameter to map it can assume the following values SPL Sound Pressure Level L ra Direct Wave Level Reverberated field level R D 85 Actual Frequency Color Scheme Min Level Max Level X divisions Y divisions L L pw e Co e Cao e A eq STI e LE ITDG eq It s the frequency for the current parameter it can assume these values 31 5 63 125 250 500 1000 2000 4000 8000 16000 Lin A Klarheitsmass Klarheitsmass Barycentrical Time Equivalent Reflection Amplitude Speech Transmission Index RASTI is the A weighted of STI Lateral Efficiency Initial Time Delay Gap Selects a standard color combination R G B Iris Blue Red Green Red White Blue White Black Defines the lowest value for the current parameter Defines the maximum value for the current parameter These values are automatically computed but you can change them manually in order to get a better dithering of a critical parameter value Defines the number of horizontal steps of the Surfer grid Defines the number of vertical steps of the Surfer grid This parameters are
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