基于行波模型的航天器附件动力吸振分析

Analysis of Dynamic Vibration Absorber for Spacecraft with Flexible Appendages via Travelling Wave Approach

将航天器梁式柔性附件的振动作为波动研究，建立附件端点带单自由度动力吸振器的航天器行波动力学模型。根据附件的等效单自由度模型设计吸振器参数，以获得最优的减振效果。结果表明，动力吸振可明显降低附件弹性振动的峰值，改善姿态运动特性，同时，行波模型具有方便局部模型修改的特点。

Travelling wave model is proposed to study the elastic vibration of spacecraft represented by central rigid body with flexible beam appendages. A dynamic vibration absorber is attached to the end of appendage to reduce the vibration amplitude. Parameters of the absorber are designed according to the equivalent single degree of freedom model of the appendage. Results show that, the absorber not only reduces the amplitude of vibration of the appendage, but also improve the dynamic behavior of the attitute motion of spacecraft. The feature of local model modification of travelling wave model is also shown.