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Stiffness optimization of a novel reconfigurable parallel kinematic manipulator

Published online by Cambridge University Press:  20 July 2011

Zhongzhe Chi  and
Dan Zhang
Zhongzhe Chi
Affiliation:
University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
Dan Zhang*
Affiliation:
University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada Harbin Institute of Technology Shenzhen Graduate School, Shenzhen University Town, Xili, Shenzhen, China
*
*Corresponding author. E-mail: [email protected]
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Summary

This paper proposes a novel design of a reconfigurable parallel kinematic manipulator used for a machine tool. After investigating the displacement and inverse kinematics of the proposed manipulator, it is found that the parasitic motions along x-, y-, and θz-axes can be eliminated. The system stiffness of the parallel manipulator is conducted. In order to locate the highest system stiffness, single and multiobjective optimizations are performed in terms of rotation angles in x- and y-axes and translation displacement in z-axis. Finally, a case study of tool path planning is presented to demonstrate the application of stiffness mapping. Through this integrated design synthesis process, the system stiffness optimization is conducted with Genetic Algorithms. By optimizing the design variables including end-effector size, base platform size, the distance between base platform and middle moving platform, and the length of the active links, the system stiffness of the proposed parallel kinematic manipulator has been greatly improved.

Keywords

DesignParallel manipulatorsStiffness optimizationStiffness controlKinematic modeling
Type
Articles
Information
Robotica , Volume 30 , Issue 3 , May 2012 , pp. 433 - 447
Copyright
Copyright © Cambridge University Press 2011

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