YE Peng-da,YOU Jing-jing,QIU Xin,et al.Interval discretization method for workspace of parallel robot[J].Optics and Precision Engineering,2021,29(08):1847-1856.
YE Peng-da,YOU Jing-jing,QIU Xin,et al.Interval discretization method for workspace of parallel robot[J].Optics and Precision Engineering,2021,29(08):1847-1856. DOI: 10.37188/OPE.20212908.1847.
Interval discretization method for workspace of parallel robot
The traditional point discretization method (PDM) for the workspace determination of parallel robots has some drawbacks such as low accuracy and missing points. In view of these, considering a 3-RPR planar parallel robot as the research object, an interval discretization method (IDM) with high accuracy and no point omission is proposed based on the interval mathematics theory. Firstly, an expression for the analytic inverse solution of the robot is derived. Then, the position/orientation workspace is obtained using the IDM. Subsequently, the efficiency, accuracy, and error sensitivity of the IDM and PDM are compared. The results indicate the following: (i) with the improvement of calculation accuracy, the efficiency advantage of the IDM becomes increasingly evident; (ii) the calculation error of the IDM and PDM are 0.002% and 0.272%, respectively; and (iii) the sensitivities of the IDM and PDM to the errors of structural size of the robot are 0.394 and 0.396, respectively. The research methods and conclusions provide theoretical guidance for topology optimization and trajectory planning of parallel robots.
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