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A mathematical model for a pneumatically actuated robotic fibre placement system

Published online by Cambridge University Press:  06 September 2002

Gürsel Alici ,
Bijan Shirinzadeh ,
Andrew McConville ,
Chee W. Foong  and
Marcelo Ang
Gürsel Alici*
Affiliation:
Robotics & Mechatronics Research Laboratory, Department of Mechanical Engineering, Monash University, P.O. Box 31, Clayton, Victoria 3800 (Australia)
Bijan Shirinzadeh
Affiliation:
Robotics & Mechatronics Research Laboratory, Department of Mechanical Engineering, Monash University, P.O. Box 31, Clayton, Victoria 3800 (Australia)
Andrew McConville
Affiliation:
Robotics & Mechatronics Research Laboratory, Department of Mechanical Engineering, Monash University, P.O. Box 31, Clayton, Victoria 3800 (Australia)
Chee W. Foong
Affiliation:
Robotics & Mechatronics Research Laboratory, Department of Mechanical Engineering, Monash University, P.O. Box 31, Clayton, Victoria 3800 (Australia)
Marcelo Ang
Affiliation:
National University of Singapore, Department of Mechanical and Production Engineering, 10 Kent Ridge Crescent, 119260 Singapore
*
Email: gursel.alici@eng.monash.edu.au
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Summary

In this paper, a lumped parameter model of a robotic fibre placement system consisting of a Motoman SK-120 robot, a force/torque sensor, a pneumatic actuator and a stiff workpiece holder is developed and experimentally verified for the purpose of predicting and characterising the dynamic behaviour of the fibre placement system. Special attention has been given to the dynamics of the actuator which is represented as a mass confined to move between two non-linear springs and dampers. The overall model containing manipulator, force sensor, pneumatic actuator and the workpiece holder dynamics is of the tenth order. Step response experiments were conducted to verify the model and to determine the approximate values of the parameters in the mathematical model. The results prove that the established model is accurate enough to explain the dynamic behaviour of the fibre placement system and it can be employed to quantify the influence of the dynamics of the pneumatic actuator on the constant force-based fibre placement. The well-known fact that the dynamics of the pneumatic actuator varies with the piston position has also been experimentally demonstrated.

Keywords

Pneumatic actuatorsMathematical modellingRobotic fibre placementForce sensing
Type
Research Article
Information
Robotica , Volume 20 , Issue 5 , September 2002 , pp. 545 - 551
Copyright
Copyright © Cambridge University Press 2002

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