某型卫星的随机振动仿真预测与试验验证

The Random Vibration Simulation Prediction and Test Verification of a Satellite

为研究某型微纳卫星的随机响应特性,在随机振动激励下,对卫星结构进行仿真分析和试验研究。随机响应仿真分析结果显示观测点三个方向的加速度均方值呈上升、波动而后趋于平缓的走势,且不同观测点在同一方向上的曲线走势基本一致,X方向均方根加速度最大为16.59 g,Y方向均方根加速度最大为14.65g,Z方向均方根加速度最大为8.97 g,各测点的整体响应相对较小,证明卫星具有良好的抗振性能,能够确保卫星上安装设备的可靠运行。随机振动试验得到X向、Y向、Z向的最大均方根加速度分别为16.78 g、16.6 g和13.4 g。从整体来看,仿真与试验得到的均方根加速度最大值能够很好的对应,因此仿真结果能够部分反应结构的真实振动特性,为卫星的后续深入研究提供了参考依据。

In order to study the random response characteristics of a micro-satellite,simulation analysis and experimental study of the satellite structure under random vibration excitation are carried out.The results of random response simulation analysis show that the curve trend of different observation points in the same direction is basically the same.The maximum root mean square acceleration of X-direction is 14.59 g,Y-direction is 14.65 and the Z direction is 8.97 g.The overall response of each observation point is relatively small,which proves that the satellite has good anti-vibration performance and can ensure the reliable operation of the equipment installed on the satellite.The test results show that the maximum root mean square acceleration of X-direction,Y-direction and Z-direction are 16.78 g,16.6 g and 13.4 g respectively.As a whole,the root mean square acceleration maxima obtained from the simulation and the experiments can correspond well,so the simulation results can partially respond to the real vibration characteristics of the structure,which provide a reference for the subsequent in-depth study of the remote sensing satellite.