Virtual Laboratory
Sardar Patel Institute of Technology, Andheri(W), Mumbai
Department of Electronics Engineering

  • Aim

  • Pre-Test

  • Theory

  • Procedure

  • Simulator

  • Post-Test

  • Conclusion

  • Contact Us

Aim


Aim

Flow Control System Using LabVIEW

__________________________________________________________________________________________________________________


Pre-Requisites

  1. Knowledge of PID Controller
  2. Knowledge of Instrumentation Components( Control Valves, E/P Converter etc)
  3. Knowledge of closed loop system

__________________________________________________________________________________________________________________


Objectives

  1. To study P, PI, PID control algorithms for flow control system.
  2. To study various tuning methods.


Pre-Quiz

__________________________________________________________________________________________________________________

1.Which of the following is a desirable characteristic of an instrument ?





__________________________________________________________________________________________________________________

2. Response of a system to a sinusoidal input is called __________ response.





__________________________________________________________________________________________________________________

3. The operation of a rotameter is based on





__________________________________________________________________________________________________________________

4. On-off controllers are normally used for





__________________________________________________________________________________________________________________

5. Which of the following is not a differential pressure flow meter ?





__________________________________________________________________________________________________________________




Theory


Block Diagram of System

Water is pumped into the tank of flow control trainer. This water enters the orifice through a thin pipe thus creating a pressure difference. This pressure difference is converted to equivalent voltage by the E/P converter. Converted voltage (Process Variable) is acquired through NI myRIO card and given to LabVIEW which compares this voltage with a setpoint voltage. Set point is already set by the user according to desired flow rate. Controller implemented in LabVIEW installed on computer applies an algorithm accordingly to give feedback to the plant. This feedback decides the extent of opening and closing of control valve in the flow control trainer. This effectively controls the flow rate of water.


Actual view of Flow Control Trainer

Schematic of Flow Control Trainer



LabVIEW

LabVIEW (short for Laboratory Virtual Instrument Engineering Workbench) is a system-design platform and development environment for a visual programming language from National Instruments. LabVIEW programs/subroutines are called virtual instruments (VIs). Each VI has three components: a block diagram, a front panel and a connector panel. The last is used to represent the VI in the block diagrams of other calling VIs. The front panel is built using controls and indicators. Controls are inputs – they allow a user to supply information to the VI. Indicators are outputs – they indicate, or display, the results based on the inputs given to the VI. The back panel, which is a block diagram, contains the graphical source code. All of the objects placed on the front panel will appear on the back panel as terminals. The back panel also contains structures and functions which perform operations on controls and supply data to indicators. The structures and functions are found on the Functions palette and can be placed on the back panel. Thus a virtual instrument can be run as a program with the front panel serving as a user interface. The graphical approach also allows non-programmers to build programs by dragging and dropping virtual representations of lab equipment with which they are already familiar.

NI myDAQ

NI myDAQ is a low-cost data acquisition (DAQ) device that gives user the ability to measure and analyze live signals anywhere, anytime. NI myDAQ is compact and portable so user can extend hands-on learning outside of the lab environment using industry-standard tools and methods.


Procedure


  1. Run Flow Control system simulator.
  2. Observe and study the results.

Go to the Simulator tab for performing the simulation.

Simulator


Click here to run the simulator.

Click here to download LabVIEW Run-Time Engine.(LVRTE)


NOTE: Before running the simulation, download the LVRTE86min.exe file from NI website from the direct link available through “Click here to download LabVIEW Run-Time Engine.(LVRTE)” option. You would require your own user login at NI webpage (if you don’t have already) for downloading the .exe file. Run the .exe file. Then unzip the .zip file.

The plugins are installed in “C:/Programfiles/NationalInstruments/Shared/LabVIEW Run-Time/Current LabVIEW Version8.6/Browser Plugins”.

Copy both the Plugins LV86ActiveXControl.dll (for Internet Explorer), nplv86win32.dll (for Mozilla) and paste in respective browser plugins.
(Eg. C://programfiles/Internet Explorer/Plugins and
C://programfiles/Mozilla Firefox/Plugins)


Post-Quiz

__________________________________________________________________________________________________________________

1.Which of the following is a desirable characteristic of an instrument ?





__________________________________________________________________________________________________________________

2. Response of a system to a sinusoidal input is called __________ response.





__________________________________________________________________________________________________________________

3. The operation of a rotameter is based on





__________________________________________________________________________________________________________________

4. On-off controllers are normally used for





__________________________________________________________________________________________________________________

5. Which of the following is not a differential pressure flow meter ?





__________________________________________________________________________________________________________________




Conclusion


Results

  1. Observe and compare the theoretical and practical responses for a particular value of controller gain.
  2. Tabulate the results for various values of Kp, Ki and Kd.(E.g. Controller gain v/s error signal)
  3. Compare various controllers performance on the kit for the same value of gain.(P controller, PI controller etc)


__________________________________________________________________________________________________________________


Assignment

  1. What do you mean by process control?
  2. Find out various controllers used in industries. List various advantages and disadvantages of P, PI and PID controller.
  3. Discuss various tuning methods. Find out the best tuning method and justify your answer.
  4. Discuss the working of flow control trainer kit.


1) Electronics Engineering Department
Bharatiya Vidya Bhavan’s
Sardar Patel Institute of Technology
Munshi Nagar, Andheri(W), Mumbai-400058
http://etrx.spit.ac.in/
022-26707440


2) Dr. S.S Rathod
Designation: Professor & HOD, Electronics Engineering Department
Qualification: Ph.D. (IIT Roorkee)
Experience: 18 Years
Expertise: Semiconductor Device Modeling, VLSI Design, Radiation Effects
Email: surendra_rathod@spit.ac.in




3) Prof. P. V. Kasambe
Designation: Assistant Professor
Qualification: M.E. (Pursuing Ph.D.)
Experience: 16 Years
Expertise: Control Sys, Instrumentation, Linear IC, MEMS, IC Technology
Email: prashant_kasambe@spit.ac.in



3) Prof. Reena Sonkusare
Designation: Assistant Professor
Qualification: M.Tech. (Pursuing Ph.D.)
Experience: 16 Years
Expertise: Fiber Optic Communication, Microwave Engineering, VLSI Design
Email: reena_kumbhare@spit.ac.in



4) Tushar Mohan Shingade
M.E.(Electronics and Telecommunication)
Expertise: LabVIEW Programming, MATLAB Programming, scilab Programming,
NI myDAQ, NI myRIO,NI Multisim,Altium PCB designer,Basic webpage design.
Email:tusharshingade100@gmail.com




Developed by Tushar Shingade & Electronics Engineering Department.

We are thankful to Dr. D.R. Kalbande(HOD,Computer Department,SPIT,Mumbai), Mr. Shrikant (SysAdmin), Computer engineering students Varsha Shetty and Kaushik Pai for helping in designing web page.


Copyright © 2016 Bharatiya Vidya Bhavans Sardar Patel Institute of Technology Munshi Nagar, Andheri (West), Mumbai 400 058. All Rights Reserved.(91)-(022)-26707440.