Torsion Bar 1.0 Mechatronics Trainer

By: 20-sim  11-11-2011
Keywords: Torsion Bar

What is the Torsion Bar ?

The Torsion Bar is a prototype machine that can be used to teach the basics of mechatronics and machine control. The Torsion Bar consists of two disks which are connected by a flexible beam. The stiffness of the flexible beam is deliberately chosen very low to ensure that the anti-resonance and resonance frequencies are clearly visible (3.3 Hz and 5.1 Hz). The Torsion Bar can be operated in combination with the software packages 20-sim and 20-sim 4C.

Key Features

  • Amplifier : The Torsion Bar 1.0 setup is equipped with a PWM controlled H-bridge motor amplifier that allows you to control the motor speed.
  • Communication : The Torsion Bar is equipped with an Ethernet connection (cross cable or network cable).
  • Automatic Code Generation : From 20-sim you can generate C-code to run on the Torsion Bar.
  • Command : Using 20-sim 4C you can export the generated C-code to the Torsion Bar, start running the code and stop it.
  • Monitoring and Logging : In 20-sim 4C you can monitor variables during running and use logging for off-line measurements.
  • Education : The Torsion Bar can be used as a practical setup in courses on mechatronics, machine dynamics and control. It is delivered with an extensive manual describing several experiments (see below) and a set of 20-sim models.


The Torsion Bar manual contains the following experiments.

  • Installing & Testing : How to install the software and test if the Torsion Bar is working properly.
  • Measurement : The Torsion Bar is equipped with two rotary encoders to measure the rotation of the motor and the load disk. Various examples show how to use these encoders for measurements.
  • Identification : Using experiments you learn how to identify the components that contribute to the dynamic behavior of the Torsion Bar. These components can be combined into a simulation model of the Torsion Bar.
  • Control : You will learn about feedback loops and run experiments to discover the basics of P, PI and PID control.


  • A Windows PC with an ethernet connection.
  • 20-sim 4.0 Professional or higher.
  • 20-sim 4C 1.1 or higher.


Keywords: Torsion Bar

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