2 DOF Ball Balancer

Engineering Control Systems
Quanser 2 DOF Ball Balancer

Vision-Based Experiment for Teaching

The 2 DOF Ball Balancer module is a vision-based control experiment designed to teach intermediate to advanced control concepts. You can use it to demonstrate real-world control challenges encountered in vision-based motion platforms, such as pan-tilt cameras.

The 2 DOF Ball Balancer is based on two Rotary Servo Base Units. Using this experiment, students can take what they learned in the one-dimensional Ball and Beam experiment, and apply it to the X-Y planar case.

The 2 DOF Ball Balancer module consists of a plate on which a ball can be placed and is free to move. Two Rotary Servo Base Units are connected to the sides of the plate using 2 DOF gimbals. The plate can swivel about in any direction. By controlling the position of the servo load gears, the tilt angle of the plate can be adjusted to balance the ball to a desired planar position.

The digital camera mounted overhead captures two-dimensional images of the plate and track coordinates of the ball in real time. Images are transferred quickly to the PC via a FireWire connection. Students can make the ball track various trajectories (a circle, for example), or even stabilize the ball when it is thrown onto the plate using the controller provided with the experiment.

Features

  • Precision-crafted chassis constructed of durable ABS plastic
  • Plate mounted on a 2 DOF gimbal, which allows the plates to swivel about both axes
  • High-resolution encoders for accurate sensing and positioning of table plate in 2D plane
  • High resolution, high quality, fast frame rate CCD digital camera with FireWire connection to allow quick real-time sensing of object position in 2D plane
  • Quanser image processing software and Simulink® library provided

Courseware

Modeling Topics

  • Model derivation
  • First-principles derivation
  • Transfer function representation
  • Linearization

Control Topics

  • PID
  • Multiple loops
  • Sensor analysis

Workstation Configuration

For Simulink

  • QUARC® add-on for MATLAB®/Simulink®
  • Two Rotary Servo Base Units
  • VoltPAQ-X2 linear voltage amplifier
  • One of the following DAQ devices:
    • Q2-USB
    • Q8-USB
    • QPIDe

For LabVIEW

  • Rapid Control Prototyping (Q-RCP) Toolkit® add-on for NI LabVIEW™
  • Two Rotary Servo Base Units
  • VoltPAQ-X2 linear voltage amplifier
  • One of the following DAQ devices:
    • NI CompactRIO with Q1-cRIO
    • NI myRIO with Terminal Board
    • Q2-USB
    • Q8-USB
    • QPIDe

More Information