航天器微振动稳态时域响应分析方法

摘要

The engineering requirements of spacecraft micro-vibration analysis could hardly be sat- isfied with the traditional time-integration method, which would be influenced by the rigid-body response drift and the flexible-body transient effect in the on-orbit free conditions. In this paper, an analysis method of steady time-domain response for spacecraft micro-vibration based on the complex frequency-domain analysis is presented. The realization process of this method is intro- duced and is applied to micro-vibration problems. The results show that the method is effective for micro-vibration time-domain response analysis of spacecraft under harmonic disturbances, can eliminate the rigid-body response drift and the flexible-body transient effects, and obtain the steady time-domain response directly.%由于航天器在轨工作时处于无约束状态，采用传统的时程积分法分析微振动响应会受到刚体“漂移”和弹性体瞬态效应的影响，难以获得满足实际工程需要的分析结果。文章提出了基于复频理论的航天器稳态时域响应分析方法，介绍了该方法的实现途径，并应用于某航天器微振动问题。研究结果表明：该方法对于航天器在谐波形式干扰源作用下的微振动时域响应计算，可以完全消除刚体“漂移”和弹性体瞬态效应的影响，直接获得稳态时域响应。