Numerical Investigation on Vibro-acoustic Responses of a Satellite

Abstract

The current vibro-acoustic model of a satellite is by either the intense computationally finite element (FE) method or low precisely statistical energy analysis (SEA) method. In this paper, a combined vibro-acoustic simulation of a satellite was proposed, in which division frequency, damping loss factor (DLF) model and on-board equipment modelling are three key technologies. Division frequency (f₁) is decided according to whether modes of components are over 5 when f>f₁. Hybrid FE/SEA method is recommended when f\(\leq\)f₁ with only solar arrays by SEA method and the other components by FE method, and all the components are preferred by SEA method when f>f₁. The DLF model of components was put forward based on the analysis of many experimental data, in which the DLF is negative to the area-to-mass ratio of components and frequency. Based on the SEA theory, it is proved that the on-board equipment can be simulated by the equivalent DLF of the panel. The combined method not only reduces over 80% calculation time compared with the FE method in the entire band, but also controls the prediction error within 1dB.