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Technical gazette, Vol. 30 No. 5, 2023.

Original scientific paper

https://doi.org/10.17559/TV-20220809151506

Determining Singularity-Free Inner Workspace through Offline Conversion of Assembly Modes for a 3-RRR PPM

Yin Gao orcid id orcid.org/0000-0002-6833-2525 ; School of mechanical engineering, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China
Ke Chen ; School of mechanical engineering, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China
Hong Gao ; School of mechanical engineering, Anhui Polytechnic University, 241000 Wuhu, Anhui, 241000, P. R. China
Hongmei Zheng ; School of mechanical engineering, Hefei University of Technology, Hefei, Anhui, 230009, P. R. China
Lulu Wu ; School of mechanical engineering, Anhui Polytechnic University, 241000 Wuhu, Anhui, 241000, P. R. China
Ping Xiao ; School of mechanical engineering, Anhui Polytechnic University, 241000 Wuhu, Anhui, 241000, P. R. China

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Abstract

The existing singularity avoidance methods have deficiencies, such as the conditionality of the online conversion of the assembly modes (AMs) and the kinematically redundant manipulator with the predicament of the prototype design and added complexity of the mechanism. To address these issues, a method to determine a singularity-free inner workspace through offline conversion of the AMs of the 3-RRR planar parallel manipulator (PPM) is presented. Based on the geometric relations among rods of the manipulator during the occurrence of singularity, and the singular points at or near the boundary of the workspace are permitted, the AMs and ranges of the orientation angle of the moving platform corresponding to the inner singularity-free workspace are determined through a three-dimensional search method. The simulation and experimental comparisons indicate that singular-free paths related to the constant or variable orientation angle of the moving platform can be planned on the singularity-free inner workspace.

Keywords

3-RRR PPM; first or second type of singularity; geometric relations among rods of the manipulator; offline conversion of AMs; inner singularity-free workspace

Hrčak ID:

307705

URI

https://hrcak.srce.hr/307705

Publication date:

31.8.2023.

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