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

Abstract

A dual mode equation based deterministic acoustic-structure coupling response prediction method, comprising the following steps: (1) dividing a structure and a vocal tract in an acoustic-structure coupling system into different sub-systems; (2) calculating a mode of a structure sub-system and a vocal tract sub-system; (3) calculating a coupling parameter between modes in adjacent sub-systems; (4) establishing a dual mode equation of the coupling system; (5) through pre-processing, obtaining a generalised force load accepted on the sub-system mode under the action of a deterministic load; (6) calculating a dual mode equation, and obtaining a participation factor of all the modes; and (7) through modal superposition, calculating a deterministic acoustic-structure coupling response of the system. The deterministic acoustic-structure coupling response prediction method is a dual mode equation based deterministic acoustic-structure coupling response prediction method; in the method, a system is divided into continuously coupled sub-systems, and deterministic vibration of the system is described using sub-system modes in a limited frequency band. The analysis efficiency of the method is higher than a 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...

AI Technical Summary

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

Images