An Equivalent Circuit Model of a Structure-Acoustic Coupling System

Abstract

An equivalent circuit model of a structural-acoustic coupling system consists of a coupling vocal cavity subsystem and a coupling elastic panel subsystem, wherein the coupling vocal cavity subsystem consists of a generalized source motivation and an adjustable parallel circuit, the generalized source motivation is expressed by constant-current sources in parallel connection, one branch of the adjustable parallel circuit is a fixed resistance with the resistance value of non-coupled acoustic-mode impedance, and the other branch is an adjustable resistance with the resistance value of coupled acoustic-mode impedance; and the coupling elastic panel subsystem consists of a generalized force motivation and an adjustable parallel circuit, wherein the generalized force motivation is expressed by constant-voltage sources in serial connection, one branch of the adjustable parallel circuit is a fixed resistance with the resistance value of non-coupled structural-mode admittance, and the other branch is an adjustable resistance with the resistance value of coupled structural-mode admittance. Due to adopting the model, the intrinsic frequency of the coupling panel and the cavity system can be calculated, so that the system coupling mechanism and factors influencing the coupling degree can be conveniently and intuitively analyzed, and the analysis and optimized design of structural-acoustic coupling problems can be conveniently conducted by engineering design personnel.

Description

technical field [0001] The invention relates to an equivalent circuit model of a structure-acoustic coupling system, belonging to the technical field of acoustic engineering. Background technique [0002] The problem of sound radiation caused by the vibration of elastic plate structures has always been an important research topic in the field of acoustic engineering. The elastic plate closed cavity structure is widely used in practical engineering fields, such as cabins of vehicles, ships, and aircrafts, etc. The sound radiation of the elastic plate structure is one of the main noise sources in the cabin. With the continuous improvement of ride comfort requirements, more and more attention has been paid to cabin noise control and acoustic design, and the study of cabin structure-acoustic coupling characteristics is the key to noise control and acoustic design. In response to this problem, Kim et al. used impedance and admittance methods to analyze the structure-acoustic cou...

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Problems solved by technology

In response to this problem, Kim et al. used impedance and admittance methods to analyze the structure-acoustic coupling problem based on previous research in 1999, but the theoretical model they proposed was not intuitive, and it was inconvenient to analyze the system coupling characteristics and affect the system coupling. degree factor

Domestic Jin Guoyong simulated the cavity structure-acoustic coupling system as a feedback and feedforward system in control theory to analyze its coupling characteristics, but the physical meaning of each element in the model is not clear, and the coupling cannot be calculated through this simulation. Key parameters such as the natural frequency of the rear elastic plate and the acoustic cavity, which limit the application of this model to a certain extent

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