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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (11): 2607-2615.doi: 10.7527/S1000-6893.2013.0165

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Optimal Design of the Isotropy Performance of a Six-dimensional Force Sensor Based on a Generalized Gough-Stewart Structure Lying on a Pair of Circular Hyperboloids

TONG Zhizhong, JIANG Hongzhou, HE Jingfeng, ZHANG Hui   

  1. School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
  • Received:2013-01-17 Revised:2013-03-12 Online:2013-11-25 Published:2013-03-19
  • Supported by:

    National Natural Science Foundation of China (51105090)

Abstract:

For a six-dimensional force sensor, a key issue in its structural design is to realize low coupling and high precision. A standard Gough-Stewart structure based six-dimensional force sensor is able to achieve the best force isotropy with a value of 0.707, and its intrinsic isotropy performance directly affects the measuring accuracy of a sensor. In this paper, a generalized Gough-Stewart structure is used to design a six-dimensional force sensor. The concept of a pair of circular hyperboloids is introduced to define a generalized Gough-Stewart structure with minimal and independent description parameters, and to achieve the optimal design of a six-dimensional force sensor with isotropy. The optimal design routine is built by deriving the closed-form and analytic formulation. Full force isotropy is proven accessible. An performed routine is proposed to design the Gough-Stewart structure with force isotropy for a six-dimensional force sensor, which could meet the position requirement of the force measure point. The research shows that the proposed routine is a novel method to generate a class of six-dimensional force sensors with best isotropy based on generalized Gough-Stewart structures, and also is a new synthesis method of parallel mechanisms.

Key words: generalized Gough-Stewart structure, isotropy, circular hyperboloid of one sheet, force sensor, optimal design

CLC Number: