Nonlinear Self-Defined Truss Element Based on the Plane Truss Structure with Flexible Connector
A finite-element method based on the self-defined truss element is developed and used to model the plane truss structure with the flexible connector, moreover, the dynamic characteristic of the corresponding model is analyzed in this paper. Firstly, a kind of new type truss structure is analyzed where the flexible connectors between trusses include clearance effects. A self-defined truss element is defined based on the mechanical analysis and then used to build the finite-element model. And the nonlinear elastic-damper model and the Coulomb friction model are adopted to analyze the nonlinear nodal forces from the clearance field. Secondly, a nonlinear numerical solution method is developed based on the Newmark implicit integrate method together with Newton–Raphson iterated method and then used to solve the nonlinear dynamic model. Finally a numerical example is performed by the method above and the effects of several key parameters (such as the contact stiffness and the clearance) on the dynamic characteristic are analyzed. The results validate the numerical solution method and show that the nonlinear finite-element model is effective.
This work was supported by the Civil Space Advanced Project of China under Grant No. C4120061309.
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