A Method for Predicting the Acoustic Characteristics of a Plate-cavity System Based on Interval Perturbation Analysis Theory

Abstract

The invention discloses a method of plate cavity system acoustic characteristic prediction based on an interval perturbation analysis theory. Firstly, a statistical energy analysis model of plate cavity system acoustic characteristic prediction and a calculation model of corresponding parameters are established based on a statistical energy analysis theory; secondly, indeterminacy of a plate cavity system is quantified through an interval model, and an interval limit of an elastic plate subsystem energy and the interval limit of an acoustic cavity subsystem energy are calculated through an interval perturbation analysis method; and finally, an elastic plate vibration velocity level interval limit and an acoustic cavity sound pressure level interval limit are calculated through the energy of each subsystem, and a frequency response distribution of a plate cavity system acoustic characteristic interval limit is obtained. In the method provided by the invention, influence of the indeterminacy on the plate cavity system acoustic characteristic is considered for the first time, idealized assumption of the indeterminacy is avoided effectively, and the plate cavity system acoustic characteristic is well consistent with practical problems in the engineering field.

Description

technical field [0001] The invention relates to the technical field of equipment noise measurement, in particular to a method for predicting the acoustic characteristics of a plate cavity system based on interval perturbation analysis theory, which is applicable to the analysis, optimization and control of vibration noise of equipment using plate structures. Background technique [0002] The plate cavity system consists of an elastic plate structure and an acoustic cavity enclosed by an elastic plate and a rigid wall. It is widely used in equipment with plate structures such as aerospace, ships, and automobiles. The elastic plate vibrates and The noise is radiated into the acoustic cavity, and the acoustic characteristics of the randomly excited plate cavity system can be obtained through statistical energy analysis. However, long-term high-level noise not only seriously affects the hearing and physical and mental health of the personnel inside the equipment, but also hinder...

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Problems solved by technology

Uncertainty quantification is the premise of predicting the acoustic characteristics of a plate-cavity system. The stochastic quantification method based on probability and statistical theory relies on large sample capacity test data with uncertain parameters, and the fitting conditions often lead to Uncertain parameter probability density functions have limited precision

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