A Method for Recognition of Acoustic Contribution of Panels in Enclosed Space Based on Local Measurement

Abstract

The invention discloses a method for identifying the acoustic contribution degree of panels in a closed space based on local measurement, which includes: setting two semi-closed holographic measurement surfaces inside the closed space, and measuring the sound pressure value on the holographic measurement surfaces; The principle is to establish the virtual source surface of the external sound field and the virtual source surface of the inward sound field in the closed space, establish the transfer relationship between the holographic measurement surface and the virtual source surface of the sound field, and calculate the source intensity column vector on the virtual source surface of the inward sound field; The admittance boundary condition of the surface of the vibrating panel to be measured and the source intensity column vector on the virtual source surface of the inward sound field are calculated, and the scattered sound field generated by the virtual source surface of the inward sound field incident on the surface of the vibrating panel to be measured is calculated to restore the The sound pressure and normal vibration velocity on the vibration panel to be measured; the vibration panel to be measured is divided into several discrete units, and the acoustic contribution of the vibration panel to be measured to the closed sound field is calculated. The invention can flexibly and quickly identify the local acoustic contribution of the structure panel in the closed space.

Description

technical field [0001] The invention relates to the technical field of noise source identification, in particular to a method for identifying the acoustic contribution of a panel in an enclosed space based on local measurement. Background technique [0002] The spatial sound field formed by the vibration of the complex elastic closed cavity structure under external excitation is the most representative type of sound field in engineering practice, such as the cabin sound field of automobiles, ships and airplanes. The comfort requirements are constantly improving, and people are paying more and more attention to the noise problem inside the closed space structure. After the external excitation energy is transmitted to the closed cavity structure, the panels vibrate and radiate structural noise into the acoustic cavity. The main factors that ultimately affect the sound field characteristics in the closed space are the vibration and acoustic characteristics of all the panels tha...

AI Technical Summary

Problems solved by technology

This method uses a set of holographic sound pressure measurements to reconstruct the entire sound field information, and uses the sound field equivalent principle to solve the acoustic contribution of each vibrating panel of the closed structure to any position in the cavity. Full-field acoustic measurements of the entire enclosed space, for larger sound source structures this requirement causes problems with increased measurement time and cost, reducing computational efficiency

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