A Deterministic Acoustic-Structure Interaction Response Prediction Method Based on Dual Mode Equations

Abstract

The invention discloses a deterministic acoustic-solid coupling response prediction method based on dual mode equations, which includes the following steps: (1) dividing the structure and acoustic cavity in the acoustic-solid coupling system into different subsystems; (2) calculating the structure The modes of the subsystem and the acoustic cavity subsystem; (3) Calculate the coupling parameters between modes in adjacent subsystems; (4) Establish the dual mode equation of the coupled system; (5) Obtain deterministic loads through pre-processing Under the action, the generalized force load on the subsystem mode; (6) Calculate the dual mode equation to obtain the participation factors of all modes; (7) Calculate the deterministic sound-solid coupling response of the system through modal superposition. The deterministic acoustic-solid coupling response prediction method provided by the present invention divides the system into continuously coupled subsystems, and uses the subsystem modes within the limited frequency band to describe the deterministic vibration of the system. The analysis efficiency of this method is higher than the traditional finite element method. .

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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