Abstract
In this work, the delta parallel manipulator (PM) was considered as a case study to present a system elastodynamic modeling of spatial PMs contain subclosed loops. The mechanism consisted of major substructures including proximal, short, and distal links. Each link was divided into elements to establish the body-to-body and body-to-ground constraint equations. The global independent generalized displacement coordinates (IGDC) of the mechanism were extracted with the theory of multi-point constraint elements. Besides, the global IGDC and substructure synthesis approach was used to obtain the complete elastodynamic modeling of the mechanism without supplementing constraint equations. The resulting configuration-dependent elastodynamic modeling had fewer degrees of freedom, different from thousands used in finite element model (FEM). The natural frequencies could be predicted at any configuration of the mechanism, and were compared against the values of FEM to assess the correctness of the modeling. The proposed modeling could predict the distribution of natural frequencies of the mechanism in the workspace with computational efficiency. Therefore, it could be used as a numerical twin to simulate the elastodynamic performance of PMs in the pre-design stage.
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Acknowledgments
This work was supported in part by the National Natural Science Foundation of China (51705465), China, in part by the Natural Science Foundation of Zhejiang Province (LGG20 E050021), China, in part by the Key research and development project of Jiaxing Science and Technology Bureau (2022BZ 10004), China.
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Chao Yang received the B.S. degree in Process Equipment & Control Engineering from Zhengzhou University of Light Industry, Zhengzhou, China, in 2005, the M.S. degree in Engineering Mechanics from Dalian University of Technology, Dalian, China, in 2009, and a Ph.D. degree in Mechanical Engineering from Zhejiang Sci-Tech University, Hangzhou, China, in 2019. He joined the Faculty of Mechanical Engineering, Jiaxing University, in 2019, where he is currently a Lecturer. His main research interests include kinematics, stiffness, dynamics, and multi-objective optimization of parallel manipulators.
Fengli Huang received the B.S. degree in Thermal Engineering from Kunming University of Science and Technology, Kunming, China, in 2000, the M.S. degree in Mechanical Engineering from Zhejiang University of Technology, Hangzhou, China, in 2005, and a Ph.D. degree in Mechanical Engineering of Tongji University, China, in 2010. He joined the Faculty of Mechanical Engineering, Jiaxing University, in 2005, where he is currently a Professor. He is the author of more than 70 articles. His research interests include modern design theory and method, mechanism theory, equipment for flexible devices, and application of parallel manipulators.
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Yang, C., Wang, Y., Lou, J. et al. Elastodynamic modeling of spatial parallel manipulators contain subclosed loops. J Mech Sci Technol 37, 1421–1431 (2023). https://doi.org/10.1007/s12206-023-0228-9
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DOI: https://doi.org/10.1007/s12206-023-0228-9