Modeling and simulation of a frictional translational joint with a flexible slider and clearance
Tóm tắt
A finite element method for the dynamic description of multibody systems with a frictional translational joint is presented and discussed in this work. By considering the slider deformation and the clearance size between the slider and the guide, Coulomb and Stribeck models are used to describe friction forces. The geometric constraints of the translational joints are treated as multi-unilateral constraints, and the impacts between the slider and guide are neglected when the clearance sizes are very small. A model of contact forces is established based on the penalty method and a criterion is proposed to evaluate the influence of clearance size on nodal contact forces. Time-varying contact states of nodes are determined by applying two contact detection algorithms for stick and slip, respectively. Based on kineto-elasto-dynamic method and varying penalty factors, the method avoids convergence difficulties and enforces the accuracy. Numerical results reveal the capability of the new method and the influences of small deformations of the slider, clearance size and friction forces on the dynamic response of the multibody systems with a translational joint.
Tài liệu tham khảo
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