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Geometric nonlinear effects on the planar dynamics of a pivoted flexible beam encountering a point-surface impact

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Abstract

Flexible-body modeling with geometric nonlinearities remains a hot topic of research by applications in multibody system dynamics undergoing large overall motions. However, the geometric nonlinear effects on the impact dynamics of flexible multibody systems have attracted significantly less attention. In this paper, a point-surface impact problem between a rigid ball and a pivoted flexible beam is investigated. The Hertzian contact law is used to describe the impact process, and the dynamic equations are formulated in the floating frame of reference using the assumed mode method. The two important geometric nonlinear effects of the flexible beam are taken into account, i.e., the longitudinal foreshortening effect due to the transverse deformation, and the stress stiffness effect due to the axial force. The simulation results show that good consistency can be obtained with the nonlinear finite element program ABAQUS/Explicit if proper geometric nonlinearities are included in the floating frame formulation. Specifically, only the foreshortening effect should be considered in a pure transverse impact for efficiency, while the stress stiffness effect should be further considered in an oblique case with much more computational effort. It also implies that the geometric nonlinear effects should be considered properly in the impact dynamic analysis of more general flexible multibody systems.

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Authors and Affiliations

  1. School of Aerospace, Tsinghua University, Beijing, 100084, China

    Qing Li, Tianshu Wang & Xingrui Ma

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  1. Qing Li
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  2. Tianshu Wang
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  3. Xingrui Ma
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Correspondence to Tianshu Wang.

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Li, Q., Wang, T. & Ma, X. Geometric nonlinear effects on the planar dynamics of a pivoted flexible beam encountering a point-surface impact. Multibody Syst Dyn 21, 249–260 (2009). https://doi.org/10.1007/s11044-008-9138-y

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  • DOI: https://doi.org/10.1007/s11044-008-9138-y

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