Certainty acoustic-structure coupling response prediction method based on dual-modality equation

Abstract

The invention discloses a certainty acoustic-structure coupling response prediction method based on dual-modality equations. The method comprises the following steps: (1) dividing structures and acoustic cavities in an acoustic-structure coupling system into different subsystems; (2) calculating modalities of structure subsystems and acoustic cavity subsystems; (3) calculating coupling parameters of modalities of adjacent subsystems; (4) establishing dual-modality equations of a coupling system; (5) performing preprocessing so as to obtain generalized force loads to subsystem modalities under the action of certainty loads; (6) calculating the dual-modality equations so as to obtain participation factors of all modalities; and (7) through modality overlapping, calculating certainty acoustic-structure coupling response. According to the certainty acoustic-structure coupling response prediction method disclosed by the invention, the system is divided into continuously coupled subsystems, certainty vibration of the system is described through subsystems inside limited frequency bands, and the analysis efficiency of the method is higher than that of conventional finite element methods.

Description

technical field [0001] The invention relates to the technical field of acoustic-structure coupling response prediction, in particular to a deterministic acoustic-structure coupling response prediction method based on dual mode equations. Background technique [0002] During the mission cycle, the spacecraft faces severe mechanical vibration, noise and other environments, which may cause structural failure or failure of precision instruments and instruments. Therefore, in the design process of the spacecraft, the influence of mechanical vibration and noise needs to be considered. Experimental method, theoretical method and numerical method can be used to predict the acoustic-structure coupling response of the system under deterministic load excitation. Among them, the test method can obtain reliable results, but the cost of carrying out the test analysis is high and the design cycle is long; the theoretical method is only suitable for simple systems, and it is difficult to s...

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Problems solved by technology

[0003] There is a modal truncation problem in the existing dual modal equation theory, that is, it is necessary to intercept the subsystem modals within a limited frequency range to participate in the response prediction. Too few selected modes will cause errors, and too many selected modes will cause computational resources. waste

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