Patch near-field acoustic holography-visualization method for three-dimensional distribution of objective parameters of sound quality

Abstract

The invention discloses a three-dimensional distribution visualization method for sound quality objective parameters based on a Patch near-field acoustical holography technology. According to the method, frequent scanning measurement is carried out on the surface of a large-scale complex sound source by means of a small microphone array in a sound field formed by large-scale structured sound source radiation, wherein incoming waves and outgoing waves exist in the sound field; the distribution information of acoustic quantities and sound quality objective parameters in the whole space sound field can be obtained through a Patch near-field acoustical holography and sound quality coupling matrix calculation model, and therefore the three-dimensional distribution visualization for the acoustics physical quantities and the sound quality objective parameters can be achieved.

Description

Technical field: [0001] The present invention relates to large-scale complex structure noise source identification and positioning technology and sound quality evaluation, more specifically, a three-dimensional distribution visualization method of sound quality objective parameters based on Patch near-field acoustic holography theory. Background technique: [0002] The near-field acoustic holography method NAH (Near‐fieldAcousticHolography) uses the acoustic near-field information obtained from the holographic measurement surface close to the sound source, and reconstructs the physical information of the sound field in the three-dimensional space (sound pressure, vibration velocity, etc.) through various mathematical transformations. Methods. The NAH method captures the evanescent wave in the sound field through near-field measurement, and obtains the vibration details of the object. In theory, it can obtain high resolution not limited by the wavelength λ, which greatly impr...

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the limitation of the measurement aperture of the acoustic holographic array, realizes the measurement, analysis and positioning of sound sources with large and complex structures, and cannot provide the distribution information of the objective parameters of sound quality in the entire space when the objective parameters of sound quality are used alone to calculate and evaluate the sound field, and The near-field acoustic holography method alone does not consider the defect of human subjective auditory factors when analyzing the spatial sound field distribution, so as to realize the purpose of identifying and locating noise sources based on human subjective auditory experience

Images