飞轮微振动的组合隔振装置设计及实验研究

针对光学遥感卫星飞轮微振动引起的成像质量下降问题，设计了一种组合隔振装置，并采用仿真分析与实验测试相结合的方法对隔振方案设计的合理性进行验证。首先，将测量的飞轮扰振数据引入光学卫星的有限元模型中，计算出飞轮扰振对光学相机的像素偏移影响；其次，设计了组合隔振方案并基于有限元方法对其隔振效果进行验证；最后，搭建了光学成像微振动实验测试平台，对不同转速下飞轮微振动造成的像素偏移影响进行精确测量。实验结果表明，组合隔振装置对300 Hz以上高频段飞轮扰振有较大衰减作用，最大像素偏移降到0.01个像素以下，隔振效率达到80%以上；通过对比可知，实验测试与仿真计算得到的像素偏移结果在低频段一次谐波响应及模态响应表现出较好一致性，但在高频段二者存在一定偏差。

Design and Experimental Study of the Combined Vibration IsolationDevice for Flywheel MicroVibration

In order to avoid image quality degradation of optical remote sensing satellite induced by flywheel micro vibration, a combined vibration isolation device is designed, and the rationality of the vibration isolation scheme is verified by combining simulation with experiment. Firstly, the measured flywheel perturbation data is introduced into the finite element model to calculate the pixel offset of the optical camera caused by the flywheel vibration. Secondly, the combined vibration isolation scheme is designed and the isolation effectiveness is verified based on the finite element analysis. Finally, the micro vibration measurement experimental platform is constructed to measure the pixel offset caused by the micro vibration of the flywheel at different speeds. The experimental results demonstrate that the combined vibration isolation device significantly suppresses the high frequency vibration of the flywheel above 300 Hz, the maximum pixel offset is reduced to 0.01 pixel, and the vibration reduction efficiency is over 80%. The experimental results show high consistency with the simulation in the response of fundamental harmonic and whirl mode at low frequency band. However, the test and simulation results have some differences in the response of high frequency band.