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Positioning method of non-conformal surface transformation noise source based on spherical-harmonic function expansion

A technology of spherical harmonic functions and non-conformal surfaces, applied in positioning, measuring devices, instruments, etc., can solve problems such as difficult positioning and identification

Pending Publication Date: 2018-06-29
GUIZHOU AEROSPACE INST OF MEASURING & TESTING TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for locating noise sources of non-conformal surface transformation based on spherical harmonic function expansion, so as to solve the problem of using spherical acoustic holography in the prior art to detect noise sources or column-like It is difficult to locate and identify shaped noise sources

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  • Positioning method of non-conformal surface transformation noise source based on spherical-harmonic function expansion
  • Positioning method of non-conformal surface transformation noise source based on spherical-harmonic function expansion
  • Positioning method of non-conformal surface transformation noise source based on spherical-harmonic function expansion

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing and specific embodiment the invention is further introduced:

[0060] The data acquisition model of the spherical array noise source is as follows: figure 1 , under open conditions, the spherical array is placed at a certain point in space, the number of elements of the spherical array is Q, and the position of the qth microphone is (x q ,y q ,z q). With the center of the spherical array as the coordinate origin (0, 0, 0), place a sound source at a distance of 0.5m from the center of the spherical array. In the air, the position of the sound source is in cylindrical coordinates (r 0 ', φ 0 , z) is (0.5m, 200°, 0m), in spherical coordinates (r 0 , θ 0 , φ 0 ) is (0.5m, 90°, 200°). The sound source frequency is 800Hz, and Gaussian white noise with SNR=35dB is added in the simulation.

[0061] The flow process of the embodiment of the present invention is as figure 2 As shown, first, the spherical array is used to c...

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Abstract

The invention discloses a positioning method of a non-conformal surface transformation noise source based on spherical-harmonic function expansion. The positioning method comprises the following steps: constructing a transfer matrix from a spherical surface to a cylindrical surface by utilizing the spherical-harmonic function expansion and reconstructing spherical array measurement data to a cylindrical structure to accurately and effectively position the noise source in the cylindrical structure or the cylindrical noise source. Compared with the prior art, the positioning method disclosed bythe invention has the following advantages: 1) sound field information in all directions of a three-dimensional space can be measured at a time through the whole directivity and the three-dimensionalsymmetry of longitude and latitude angles of a spherical array; 2) the transfer matrix from the spherical surface to the cylindrical surface is constructed, the spherical array measurement data can bereconstructed to the cylindrical surface through a sound holographic algorithm, and the positioning problem of the cylindrical noise source or the noise source in the cylindrical structure is solved.

Description

technical field [0001] The present invention relates to a method for locating a noise source or a quasi-cylindrical noise source in a cylindrical structure, in particular to a non-conformal surface transformation based on spherical harmonic function expansion, which reconstructs spherical surface measurement data into The cylindrical surface, so as to realize the method of locating the noise source or the quasi-cylindrical noise source in the cylindrical structure. Background technique [0002] In the field of noise source localization, sound field measurement by microphone array is the most commonly used method. The spherical array has omnidirectional latitude and longitude angles and three-dimensional symmetry, and can measure sound field information in all directions in three-dimensional space at one time. Its special structure gives it great flexibility and fast measurement speed, so it can be used for sound field measurement of interior spaces such as submarines, airpl...

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Application Information

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IPC IPC(8): G01S5/18
CPCG01S5/18
Inventor 丁丹丹徐军成建宏
Owner GUIZHOU AEROSPACE INST OF MEASURING & TESTING TECH
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