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Numerical methods of closed-loop multibody systems with singular configurations based on the geometrical structure of constraints

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Abstract

The geometrical structure of constraints leads to the important conclusion that components of velocities and accelerations in the normal space of the constraint hypersurface are totally determined by the constraints. Orthogonal base vectors of the constraint’s normal and tangent spaces can be obtained by the QR decomposition with column permutation. A numerical method of closed-loop multibody systems with singular configurations is presented, in which the traditional hypothesis on independence of constraints is abandoned. Instead of correcting constraint violations at the end of each integration step, positions and velocities are modified to satisfy their constraint equations before they are used to form equations of motion. Such an approach can collaborate with any standard ODE solver. In order to systematically generate constraint equations and obtain the corresponding joint’s reaction forces, rotational and translational constraints of a closed-loop are standardized as part of six explicit equations, and a clear relationship between Lagrange multipliers and joint’s reaction forces is derived based on the principle of virtual power equivalence. The proposed method can dynamically identify independent constraints and modify the equations of motion accordingly. The numerical examples validated its effectiveness.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 11872137 and No. 91748203 and No. 11802048).

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Authors and Affiliations

  1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Yingpeng Zhuo, Zhaohui Qi & Shudong Guo

  2. School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China

    Gang Wang

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  1. Yingpeng Zhuo
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Correspondence to Zhaohui Qi or Gang Wang.

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Zhuo, Y., Qi, Z., Wang, G. et al. Numerical methods of closed-loop multibody systems with singular configurations based on the geometrical structure of constraints. Multibody Syst Dyn 53, 275–301 (2021). https://doi.org/10.1007/s11044-021-09797-7

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