帆板及其支撑系统简化模型的动力学特性的试验和分析

DYNAMICS OF SIMPLIFIED MODEL OF SOLAR ARRAY AND SUPPORTING COMPONENTS: EXPERIMENT AND ANALYSIS

本文以空间站的太阳帆板及其支撑系统作为对象,作了简化模型的试验和理论分析,以研究该系统在空间站因姿态调整。轨道机动及其他原因干扰下的动力学特性。结果表明,由于这种系统属于大型柔性空间系统,存在着惯性非线性耦合,当存在内部谐振关系时,随着干扰力辐值的增加,系统的动力学特性也将产生急剧的变化。这种变化呈现出非线性特征,相互耦合的振型同时被激发。这种振辐的剧增将给柔性结构的形状保持和振动控制带来困难。

A simplified model of a flexible structure with a solar array and its supporting components has been tested dynamically in laboratory under a certain disturbance. The results show that the behavior of the system change a dramatically from linear to nonlinear when the amplitude of exciting torque reaches a threshold value and there exists even weak nonlinear inertia coupling. In this process, internal resonance play an important role. And the amplitnde of indirectly excited modes will be increased with the increase of the exciting torque. The lower modal can be easily excited by higher frequency if resonances exist. All these will bring trouble to shape and direction control of flexible structure.