動質量の周波数平均値を用いた人工衛星構体パネル上搭載機器の音響振動解析

抄録

Acoustically induced random vibration of satellite equipment panels is a critical design consideration in satellite development. The prediction of this random vibration is required in the early stage of satellite design in order to specify the random vibration environments of satellite equipment. Various prediction methods for the response prediction using Statistical Energy Analysis (SEA) have been developed, namely : (i) Lewis method, (ii) Point mass impedance method and (iii) Area coupling impedance method. However, first method has limited accuracy for a heavy and concentrated equipment, second one often overestimates, and third one requires a detailed parameter. In this paper, a new method combining the asymptotic apparent mass of specific equipment with Lewis method is proposed. This method takes the elastic behavior of satellite equipment instead of rigid mass into consideration. The acoustic excitation experiments for nine real satellites (404 equipment total) are conducted to compare the exiting methods with the new method in statistical sense. The result from the comparison shows that the new method provides most accurate prediction in important frequency range.