Theory Review and Test Verification about Combination of FEA and SEA Methods to Predict the Vibroacoustic Response of Spacecraft Structure

Abstract

Spacecraft is exposed to the severe random vibration by acoustic during its launch. In the spacecraft design, random vibration of spacecraft components mounted on panel structure during launch environments needs to be predicted. In the present methods, SEA is the method for analyzing the high frequency band, FEA is for the low frequency band. This paper applies combination of FEA and SEA methods to predict the vibroacoustic response of spacecraft structure which may be extended to wide frequency range experienced during the launch. The combination methods focuses on the vibroacoustic prediction which keeps advantages to use detail model of structure expressed by FEA and statistical energy approach expressed by SEA of reverberant acoustic excitation. The combination method is applied to diffuse sound field excitation of honeycomb panel, and is compared with acoustic excitation test and the results from conventional approach of BEM ,joint acceptance and SEA.