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A simplified hybrid force/position controller method for the walking robots

Published online by Cambridge University Press:  01 November 1999

Jun Song ,
K.H. Low  and
Weimiao Guo
Jun Song
Affiliation:
Robotics Research Center, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798 (Republic of Singapore)[email protected]
K.H. Low
Affiliation:
Robotics Research Center, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798 (Republic of Singapore)[email protected]
Weimiao Guo
Affiliation:
Robotics Research Center, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798 (Republic of Singapore)[email protected]
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Abstract

Force and position sensors have been widely used in robots to realize compliance and precise control. Traditional force/position control methods were studied and developed by the inverse dynamics for decades. Generally speaking, the controller contains two parts: One is the error-driven part that guarantees system stability; another is the identification model of inverse dynamics that can compensate for system influence. In practical control engineering, a system inverse dynamics or its identification model is not easy to obtain, even when using nonlinear estimation methods. Moreover, the complicated control algorithm cannot be implemented in on-board microprocessors because of the limited speed and memory. Thus, a simplified control method using a forward system model is introduced in this paper. Since the direct dynamics of the system can be more easily obtained than the inverse dynamics, this, in turn, simplifies the control structure and increases control speed. Therefore, the proposed control policy has a wider practical application.

Keywords

Hybrid controlForce controlWalking robots
Type
Research Article
Information
Robotica , Volume 17 , Issue 6 , November 1999 , pp. 583 - 589
Copyright
© 1999 Cambridge University Press

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