Sound-structure interaction system structure vibration response prediction method, system and storable medium

Abstract

The invention discloses a sound-structure-structure coupling system structure vibration response prediction method, a system and a storable medium, and relates to the related technical field of mechanical vibration noise analysis. The specific steps of the method are as follows: decoupling a sound-structure-structure coupling system into a sound cavity subsystem and a structure subsystem, and respectively establishing a model of each subsystem; performing modal analysis on the uncoupled subsystem, respectively extracting modal data of the structure subsystem and the acoustic cavity subsystem, and calculating modal coupling parameters between the two subsystems by using the modal data of the structure subsystem and the acoustic cavity subsystem; obtaining a dual mode equation of the acoustic-solid coupling system according to the mode coupling parameters and the models of the subsystems; obtaining a system acoustic-structure coupling response according to the dual-mode equation; According to the invention, the finite element and the dual mode are combined, so that the efficiency of the prediction method is improved, data support can be provided for noise control of the engine, the research and development period is shortened, the delivery speed is increased, and the competitive advantage is increased.

Description

technical field [0001] The present invention relates to the related technical field of mechanical vibration and noise analysis, and more specifically relates to a method, system and storage medium for predicting structural vibration response of an acoustic-solid coupling system. Background technique [0002] Acoustic-solid coupling problems widely exist in aerospace structures, especially for thin-walled structures under high-frequency excitation, the acoustic-solid coupling effect is easily generated between the structure and the sound field, causing the vibration of the structure and changing the distribution of the sound field, and then Affect the safety of the structure and the functionality of the equipment. Therefore, the vibration level of the structure and the noise level of the acoustic field are important indicators that must be considered in the structural design stage. Experimental methods, theoretical methods, and numerical methods can be used to predict the aco...

AI Technical Summary

Problems solved by technology

However, the assumptions of the statistical energy analysis method are often not fully satisfied in engineering applications, and its application is limited to a single frequency band, requiring a large number of experiments to find suitable modal data for response prediction. Therefore, it is an urgent problem for those skilled in the art to find a method that can improve the prediction efficiency of structural vibration response.

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