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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。
In order to calculate the response of the satellite box structure in middle and high frequency range under the disturbance of flywheel, the finite element method is used to study the response. By analyzing the main cause of the disturbance and the characteristics of the flywheel disturbance model, the energy density response of the structure vibration is calculated by the sine sweep excitation. The spatial and frequency domain distributions of the energy density of the satellite box structure are obtained and compared with the results of the wave method. The results show that the energy density of the disturbance response at the flywheel position is the highest. The energy finite element method is the average of the results of the wave method. The requirements of the excitation and boundary model are lower. It is more suitable for high frequency vibration field and engineering practice. The disturbance response calculation provides a new idea.