飞轮扰动作用下卫星结构响应能量预示方法

Vibration responses prediction of satellite structure caused by disturbances of flying wheels using energy method

为计算卫星框式结构在飞轮扰动下中高频域的响应,用能量有限元法对其进行研究。通过分析产生扰动的主因及飞轮扰动模型特性,采用正弦扫频激励,计算结构振动的能量密度响应,得到卫星框式结构能量密度的空间域及频率域分布,并与波动方法的结果进行对比。结果表明,飞轮位置处扰动响应的能量密度最高,能量有限元法是对波动方法结果的平均,对激励与边界模型的要求较低,更适用于高频振动领域及工程实际,为航天器结构的扰动响应计算提供一种新思路。

Energy finite element method （EFEM） was used to predict structural vibration responses caused by disturbances of flying wheels. The main cause of the disturbances was discussed and a sinusoidal force was adopted as an excitation after analyzing the characteristics of model of flying wheels disturbances. The energy density responses of the vibration in space and frequency domains were calculated and compared with the responses obtained by the wave method. It is indicated that the results from the EFEM correspond to the averaged results from the traditional wave method. Besides, the results show that the EFEM applies less demands on the mathematical models of excitations and boundaries, and as a newly introduced method for responses calculation of the spacecraft under flying wheels disturbances, the EFEM is expected more practical in the engineering and high-frequency field.