基于SEA的空间光学遥感器冲击响应预测

Shock responses prediction for space optic remote sensors based on statistical energy analysis

为了对空间光学遥感器进行冲击响应预测,提出了一种基于统计能量分析(Statistical Energy Analysis,SEA)原理的新方法;基于稳态SEA推导了瞬态SEA的能量流平衡方程,结合虚拟模态综合与仿真方法(Virtual Mode Synthesis and Simulation,VMSS)和SEA方法进行空间光学遥感器的冲击响应预测;首先根据SEA原理,建立了典型空间光学遥感器的简化SEA模型,采用理论计算和试验测试的方法,得到了该模型各子系统的模态密度、内损耗因子、耦合损耗因子;在火工品附近安装冲击加速度传感器,点火起爆,测得冲击加速度时域曲线,以该测试数据为分析模型的输入,基于SEA方法进行冲击响应分析,得到反射镜子系统、遮光罩子系统、载荷板子系统的冲击响应谱曲线,该曲线与试验数据比对表明,在低频段由于模态密度较低,预测精度较差,在高频段其一致性小于4d B,从而验证了该方法在结构高频冲击响应预测的有效性。

In order to predict shock responses of space optic remote sensors,a new method based on statistical energy analysis（ SEA） was proposed. The balance equation of energy flow of transient state SEA was deduced based on the steady state of SEA. Combining the virtual modes synthesis and simulation with the SEA,the shock responses of space optic remote sensors were predicted. Firstly,the simplified SEA model of a representative optic remote sensor was built.The model subsystems＇ modal density,inner loss factor and coupled loss factor were obtained using theory calculation and tests. Two shock acceleration sensors were placed nearby explosive bolts,after detonation,the shock acceleration time history curves was measured. The data were input into the analysis model,the shock response spectra curves of subsystems were obained with SEA. The curves were compared with test data,the results showed that at lower frequency range because of the lower modal density the prediction precision is not as good as that at higher frequency range,the error is less than 4d B at higher frequency range,so the effectiveness of the proposed method for predicting structural higher frequency shock responses is verified.