Abstract

Joint components in complex deployable truss structures on spacecraft show strong nonlinear characteristics, which can produce significant influences on overall dynamic characteristics of jointed beam structure. In this study, the dynamic characteristics of revolute-jointed beam, considering cubic nonlinearity are investigated using describing function method. For the revolute joint, additional degree of freedom at the location of joint is introduced, on which a generalized force is acted to estimate constraint of joint. Then the effectiveness validation of the theoretical model, and the analysis on effects of joint on the natural and dynamic characteristics of jointed beam are presented.

摘要

航天器复杂可展开桁架结构中的节点部件表现出很强的非线性特性，对节点梁结构的整体动力特性产生显着影响。本研究采用描述函数法研究了考虑三次非线性的旋转铰接梁的动力学特性。对于旋转关节，在关节位置引入额外的自由度，在其上施加广义力来估计关节的约束。然后对理论模型进行了有效性验证，分析了节点对节点梁的自然和动力特性的影响。