Volume 37 Issue 4
Jul.  2015
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BAI Yunfei, CONG Ming, YANG Xiaolei, LIU Dong. Kinematic Parameter Identification for 6R Serial Robots Based on a 6-Parameter Model[J]. ROBOT, 2015, 37(4): 486-492. DOI: 10.13973/j.cnki.robot.2015.0486
Citation: BAI Yunfei, CONG Ming, YANG Xiaolei, LIU Dong. Kinematic Parameter Identification for 6R Serial Robots Based on a 6-Parameter Model[J]. ROBOT, 2015, 37(4): 486-492. DOI: 10.13973/j.cnki.robot.2015.0486
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Kinematic Parameter Identification for 6R Serial Robots Based on a 6-Parameter Model

  • School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China

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  • Received Date: January 25, 2015
  • Revised Date: April 15, 2015
  • Available Online: October 26, 2022
  • Published Date: July 19, 2015
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    • Abstract
  • To avoid discontinuous parameters and low-speed convergence in kinematic parameter error identification, an error model for 6R serial robots based on a 6-parameter model is established in the link coordinate systems set up with DH (Denavit-Hartenberg) method. A formula for parameter conversion is derived. In order to compare the results produced by the MDH (modified DH) model and the 6-parameter model, a computer simulation experiment in presence of random noise errors in drives and measuring instruments is designed. The average absolute error is decreased by 96.1% and 52.9% respectively by using the 6-parameter model and the MDH model. The results show that the 6-parameter model has completeness and continuity. The range of model parameters can be derived from the manufacturing tolerances. The 6-parameter model is superior to the MDH model in terms of identification speed. By limiting the parameter range, the influence of lack-of-minimality on error identification is eliminated. The method is applied to parameter identification of an SR165 robot, and the average positioning error is reduced from 2.5 mm to 0.35 mm.
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    • References (13)
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