Electronic Module of Hydraulic Damper Test Bench
Contents
1. included The main steps included in Build Run and Debug of ARM application are 1 Creating Front Pang ro orm le Peesaan Te eteni e lt cam Fig 4 Selecting labels 2 Creating block diagram os i i Pox an A one Fig 5 Creating Block Diagram 3 Building and running application For faster development of embedded module a JTAG connector was placed on board This offers In Circuit Emulation and Programming as well as advanced debugging techniques like step by step execution register watch multiple hardware and conditioned breakpoints 4 PID CONTROL ALGORITHM PID proportional integrative derivative algorithm is the most common algorithm used in industry PID controller determines the output value basically as valve position It applies the controller output value to the system which in turn drives the process variable towards the set point value 6 9 PID controller compares PV process variable to that of SV set point value to get e error e SV PV IJSER 2013 http www ijser org International Journal of Scientific amp Engineering Research Volume 4 Issue 1 January 2013 4 ISSN 2229 5518 Then PID controller calculates the controller action u t where Kc is controller gain u t Ke 1 7 evar T We dt 0 If the error and controller output have same range 100 to 100 controller gain is the reciprocal of proportional band Ti is the integral time2. H bridge to prevent the blow off microcontroller Driver circuitry uses MOSFETs PWM frequency should never exceed the switching speed of MOSFET Timer also called as counter as inbuilt microcontroller peripheral used to generate accurately time pulse PWM signals ARM have amp bit and 16 bit timer Timer to be used is governed by bit accuracy mode of operation fast PWM phase correct PWM phase and frequency correct PWM that varies with actuator output mode 3 SOFTWARE DESIGN The LabVIEW Embedded Module for ARM Microcontrollers iS a comprehensive graphical development environment for enbedded design 8 This module builds on NI LabVIEW Embedded technology which facilitates dataflow graphical programming for embedded systems and includes hundreds of analysis and signal processing functions integrated I O and an interactive debugging interface The Embedded Module for ARM Microcontrollers has the following requirements e A computer with Windows Vista XP 2000 e RealView Microcontroller Deveopment Kit including Kell pVision3 e LabVIEW 86 with embedded support e Kel ULINK2USB TAG adaptor To install LM 358962 evaluation board with JTAG emulation we need e LM 3S8962 evaluation board e An IBM compatible PC with two unused USB ports one to supply power to the board and the othe to peform ULINK2 USB JTAG downloading and debugging e ULINK2 USB JTAG adaptor included e Two USB serial cables each no longer than 10 feet
3. C Reduced Instruction Set Computer microcontroller interfaced with hydraulic damper in virtual instrument software known as LabVIEW Laboratory Virtual Instrument Engineering Workbench 3 The use of digital control system on the chip microcontroller is the miniaturized form and also enhances the control system that integrate microcontroller processing Input sensor feeding signal conditioning peripherals like LCD keyboards interfacing and outputs Such control system requires hardware design and software develooment C or assembly language This paper basically presents the design of control system using LM3S8962 a 32 bit RISC microcontroller with the modification that can be easily adapted to the specific issue of industrial process IJSER 2013 http www ijser org International Journal of Scientific amp Engineering Research Volume 4 Issue 1 January 2013 2 ISSN 2229 5518 2 HARDWARE DESIGN The hydraulic damper test bench was used to be based on mechanical systems only a few years ago The main components of this system are servo amplifier servo valve hydraulic cylinder load position transducer Fig 1 Block Diagram of Mechanical Damper System According to the structure of position control system of hydraulic system efforts were done to create this mechatronic system of hydraulic damper test bench with the better performance that make use of digital control system on the chip microcontroller Digital controller
4. International Journal of Scientific amp Engineering Research Volume 4 Issue 1 January 2013 1 ISSN 2229 5518 Electronic Module of Hydraulic Damper Test Bench using ARM Microcontroller Interfacing in LabVIEW Hare Ram Jha Akash Priyadarshi Anamika Kumari ABSTRACT The paper presents the universal electronic module based on System on Chip SOC architecture It is related to the Industrial Control System ICS dealing with the software and hardware design of chip along with its implementation in hydraulic damper test benches It mainly focuses on the use of a 32 bit RISC micro controller to test the new or repaired pumps or valves with the help of virtual instrument technology software The paper also contains the proposed results and observations made for test bench in LabVIEW with the help of PID algorithm Thus the paper basically emphasizes on the use of different hardware and software components used in chip making and interfacing with a number of required peripherals Index Terms Hydraulic damper test bench Industrial control system LabVIEW SOC Microcontroller PID algorithm PWM 1 INTRODUCTION An Industrial Control System consists of various control systems used in industrial production including supervisory control and data acquition SCADA system distributed control system DCS and programmable logic controllers PLC This system requires continuous monitoring and control of many parameters An effective industrial cont
5. e The cycletime is fixed at 0 5 s Fig 9 Block Diagram of Tank Level VI industrial control system is capable of performing in amore effective way with lower cost high accuracy saving in chip complexity and area lower power consumption The LM 358962 microcontroller offers the advantages of ARM s widely available devedopment tools System on Chip SoC IJSER 2013 http www ijser org International Journal of Scientific amp Engineering Research Volume 4 Issue 1 January 2013 5 ISSN 2229 5518 infrastructure IP applications and a large user community This module requires hardware design electronic schematics and software devdopment It is implemented with PID algorithm that provides auto tuning The work of PID controllers varies from reading sensor to computing the desired output Integration of all this make the module very flexible and suitable to be implemented in hydraulic application hydraulic damper test bench 7 REFERENCES CONFERENCES 1 A Drumea Al Vasile P Svasta M Blejan System on Chip Signal Conditioner for LVDT Sensors 1st Electronics System integration Technology Conference ESTC06 Dresden Germany September 2006 pp 629 633 2 A Drumea Al Vasile P Svasta Ilie System on Chip Signal Conditioner for LVDT Sensors 2nd Electronics System integration Technology Conference ESTCO8 September 2008 3 W Guime amp al Mine Pump Comprehensive Performance Testing Sys
6. in minutes called reset time and Td is the derivative time called rate time For proportional action the required formula is U t K For integral action the required formula is t u t K cue 7 For derivative action the required formula is u t K de dt T Fig 6 Electronic module of Digital Control Sytem using PID Algorithm Test for integrated dectronic module for mechatronic systems are performed on a hydraulic damper test bench that contains pump unit linear actuator hydraulic cylinder with attached displacement and force transducer This test is done with the hap of PID algorithm in LabVIEW 4 7 5 SIMULATION AND RESULT The DAQ data acquisition system with the closed loop makes PID algorithm productive So we can 6 CONCLUSION The simulations and results shows that the LM 3S8962 microcontroller based electronic module for the use the advanced level DAQ Vis Virtual Instrument to configure the analog input and output only once instead of on each loop iteration Fat Coni aes Pages Fig 7 Process set point The simulation of damper test bench using ARM 920T microcontroller is a proposed one 9 One of its basic testing known as water level testing is performed as below rn tm a mo Cati oa w AC a 7 b Cc aaw 4 as Fig 8 Front Panel of tank level The Tank Leva VI uses an integrating process with added noise valve dead band lag and dead tim
7. nal interrupt handling by implementing the register manipulations required for handling an Interrupt in hardware deterministic memory protection unit MPU to provide a privileged mode of operation for complex applications migration from the ARM 7 processor family for better performance and power efficiency Pressure Temperature Displacement transducer transducer transducer E _ _ PWM outputs http www ijser org International Journal of Scientific amp Engineering Research Volume 4 Issue 1 January 2013 3 ISSN 2229 5518 Interface for inductive displacement transducer LVDT Linear Variable Differential Transformer sensor for measuring physical parameter such as pressure force displacement LVDT signal conditioning requires pulse width modulation system analog to digital converter ADC timer processing power Excitation frequency range 1 10KHz and the signal is read in digital inputs RS485 is used for signal communication twisted cable differential signal transmission speed of 35M bit s up to 10 m and 100 Kbit s up to 1200 m between drivers and recevers Low pin count drivers bring RS485 to active state PWM output for servo valve ARM have ADC but do not have DAC thus PWM output is the closet solution ARM produces PWM output with the use of various timer and comparator Connection between actuators servo valve dc motor and output pin is done with the electronic circuit called motor controller or
8. of this system is LM 358962 a 32 bit RISC microcontroller and the electronic module was developed with this Module consists of 6 onboard relays 8 analog inputs 4 analog outputs 8 digital lines as input or output keyboard interface LCD interface 4 open drain output LVDT Linear Variable Differential Transformer PWM Pulse Width Modulation output for servo valve RS485 interface 1 5 ARM Cortex M3 Fig 2 Block Diagram of ARM Cortex M 3 Processor Core The Luminary Micro Stdlaris family of microcontrolles the first ARM Cortex M3_ based controllers brings high performance 32 bit computing to cost sensitive embedded microcontroller applications These pioneering parts ddiver customers 32 bit performance at a cost equivalent to legacy amp and 16 bit INSER 2013 devices all in a package with a small footprint Additionally the microcontroller uses ARM s Thumb compatible Thumb 2 instruction set to reduce memory requirements and thereby cost Finally the LM3S8962 microcontroller is code compatible to all members of the extensive Stellaris family providing flexibility to fit our customers precise needs Features include compact core Thumb 2 instruction set delivering the high performance expected of an ARM corein the memorysize usually associated with 8 and 16 bit devices rapid application execution through H arvard architecture characterized by separate buses for instruction and data exceptio
9. rol system can be made by use of digital control system from which we gain the advantages of Implementation of complex functions reiability in implementation cost effective accuracy 1 It consists of digital controller ADC and DAC Digital control system with analog counterpart makes the system more flexible This paper basically deals with the two main aspects mechanical and dectronic In mechanical system hydraulic system is restored to functionality Replace the system s oil and filter Design blocking and flushing plates for the servo valve Flush the system with the new oil to filter out old oil and debris Eliminate any oil leaks in the system In electronics system hydraulic system is restored to functionality Control cylinder position and motion Read values from the rig s sensors Be expandable so that additional sensor readings can be added Hydraulic damper test bench Is used to test the new or repaired pumps or valves The testing of hydraulic damper and its components can be made on dectronic module used for industrial control based on SoC System on Chip architecture The hydraulic damper test bench using mechanical systems only has been obsolete It is time taking not very precise and cost inefficient The electronic module for test bench using SoC architecture has already been proposed using 16 bit microcontroller 2 Howeve this paper proposes for the implementation of a 32 bit RIS
10. tem Based on Labview In Measuring Technology and Mechatronics Automation 2009 I1CM TM A 09 International Conference on 2009 pp 300 303 4 G Beitao amp al Application of LabVIEW for Hydraulic Automatic Test System in Industrial andinformation Systems 2009 11S 09 I nternational Conference on 2009 pp 348 351 BOOKS 5 Embedded control handbook Volume 1 Microchip Inc 1997 6 K Astrom B Wittenmark Computer Controlled Systems Theory and Design 3rd Edition Prentice Hall 1997 pp 324 369 7 L Bierl Das grosse MSP430 Praxis Buch Franzis 2004 pp 110 190 8 J Travis and J Kring LabVIEW for Everyone Graphical Programming M ade Easy and Fun 2006 9 N ational Instrument s PID Control Toolset User M anual AUTHOR DETAILS Hare Ram Jha is working as a Lecturer amp Research Scholar at N ational Institute of Technology Jamshedpur Jharkhand India Email id hare_167 yahoo co in Akash Priyadarshi is pursuing the degree of B Tech in Electronics amp Communication Engineering at National Institute of Technology Jamshedpur jharkhand India He IS presently at 3rd year Email id geekspeak24 gmail com Anamika Kumari is pursuing the degree of B Tech in Electronics amp Communication Engineering at National Institute of Technology Jamshedpur jharkhand ndia She IS presently at 2nd year Email id anamikajsr 1 gmail com IJSER 2013 http www ijser org
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