复杂航天器结构火工冲击环境预示方法研究

Aiming at the problem that the response of complex spacecraft structures under the excitation of pyroshock with the characteristics of wide frequency and transient state is difficult to be calculated, the prediction method of pyroshock environment for a complex satellite structure is researched. Firstly, the basic theory of the virtual mode synthesis and simulation (VMSS) based on the acceleration frequency response function (FRF) is deduced. Then, the finite element-statistical energy analysis (FE-SEA) hybrid model of the complex satellite is established and the steady acceleration FRF curves and modal number curves are obtained, providing the initial inputs of calculation with VMSS. Furthermore, the pyroshock responses of the bottom panel and side panel of the propulsion cabin are calculated and analyzed. Finally, the computed results are compared with the ones of the whole satellite separation experiment, and the two results are basically consistent. The analysis indicates that the prediction method combining the FE-SEA hybrid modeling technique and VMSS is reliable for the prediction of pyroshock environment.