Systematic Elastostatic Stiffness Model of Over-Constrained Parallel Manipulators Without Additional Constraint Equations

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外文摘要：The establishment of an elastostatic stiffness model for over constrained parallel manipulators(PMs),particularly those with over constrained subclosed loops,poses a challenge while ensuring numerical stability.This study addresses this issue by proposing a systematic elastostatic stiffness model based on matrix structural analysis(MSA)and independent displacement coordinates(IDCs)extraction techniques.To begin,the closed-loop PM is trans-formed into an open-loop PM by eliminating constraints.A subassembly element is then introduced,which considers the flexibility of both rods and joints.This approach helps circumvent the numerical instability typically encountered with traditional constraint equations.The IDCs and analytical constraint equations of nodes constrained by vari-ous joints are summarized in the appendix,utilizing multipoint constraint theory and singularity analysis,all uni-fied within a single coordinate frame.Subsequently,the open-loop mechanism is efficiently closed by referencing the constraint equations presented in the appendix,alongside its elastostatic model.The proposed method proves to be both modeling and computationally efficient due to the comprehensive summary of the constraint equations in the Appendix,eliminating the need for additional equations.An example utilizing an over constrained subclosed loops demonstrate the application of the proposed method.In conclusion,the model proposed in this study enriches the theory of elastostatic stiffness modeling of PMs and provides an effective solution for stiffness modeling chal-lenges they present.

外文关键词：

Parallel manipulatorElastostatic stiffness modelMatrix structural analysisSubassembly elementIndependent displacement coordinates

作者：

Chao Yang、Wenyong Yu、Wei Ye、Qiaohong Chen、Fengli Huang

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作者单位：

College of Mechanical and Electrical Engineering,Jiaxing University,Jiaxing 314001,Zhejiang,China

Zhejiang Siekon Transmission Technology Co.,Ltd.,Jiaxing 314001,Zhejiang,China

National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products,Zhejiang Sci-Tech University,Hangzhou 310018,Zhejiang,China

School of Computer Science and Technology,Zhejiang Sci-Tech University,Hangzhou 310018,Zhejiang,China

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基金：

National Natural Science Foundation of ChinaKey Research and Development Project of the Jiaxing Science and Technology Bureau

项目编号：

522750362022BZ10004

出版年：

2024

DOI：

10.1186/s10033-024-01060-2

中国机械工程学报

中国机械工程学会

中国机械工程学报

CSTPCD

影响因子：0.765

ISSN：1000-9345

年,卷(期)：2024.37(4)