Dual-modal equation-based dynamic response analysis method for random noise environment

Abstract

The invention provides a dual-modal equation-based dynamic response analysis method for a random noise environment. The method comprises the following steps of (1) dividing a structure and a vocal cavity in an acoustic-structural coupling system into different subsystems; (2) calculating modes of the structure subsystem and the vocal cavity subsystem; (3) calculating coupling parameters between the modes in the adjacent subsystems; (4) establishing a dual-modal equation of the coupling system; (5) through preprocessing, obtaining a cross-power spectrum of generalized force loads on the modes of the subsystems under the action of random loads; (6) calculating the dual-modal equation to obtain a cross-power spectrum of participation factors of all the modes; and (7) through modal superposition, calculating a random acoustic-structural coupling response of the system. The random dynamic response analysis method provided by the invention is the dual-modal equation-based dynamic response analysis method for the random noise environment. According to the method, the system is divided into the continuous coupling subsystems, and random vibration of the system is described by using the modes of the subsystem in a limited frequency band; and the analysis efficiency of the method is higher than that of a conventional finite element method.

Description

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

AI Technical Summary

Problems solved by technology

[0003] When predicting the dynamic response of the system under random noise excitation based on the dual mode equation theory, it is necessary to intercept the subsystem modes within a limited frequency range to participate in the response prediction. Too few selected modes will cause errors, and too many modes will be selected. Will cause waste of computing resources

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