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A near-field acoustic holography testing method and device based on the basic solution of the spherical function

A technology of near-field acoustic holography and testing methods, applied in the direction of measuring devices, electrical devices, radio wave measuring systems, etc., can solve the problems of spherical function order microphone number and position cannot be determined scientifically, and achieve less measuring points , high inversion accuracy, and easy test operation

Active Publication Date: 2019-01-11
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a near-field acoustic holographic testing method and device based on the basic solution of the spherical function, which is used to solve the problem of the order of the spherical function and the number and position of the microphones in the prior art. Questions that cannot be scientifically determined

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  • A near-field acoustic holography testing method and device based on the basic solution of the spherical function
  • A near-field acoustic holography testing method and device based on the basic solution of the spherical function
  • A near-field acoustic holography testing method and device based on the basic solution of the spherical function

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[0071] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0072] see Figure 1 to Figure 15 . It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. within the scope covered by the disclosed technical content. At the same t...

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Abstract

The invention provides a near-field acoustic holography test method based on a spherical function basic solution and a near-field acoustic holography test device thereof. The test method comprises the steps that the order N of the used spherical function basic solution and the number and the position of microphones on a spherical holographic measuring surface are determined, sound pressure measurement is performed on the determined measurement points and the acoustic physical quantity of the surface of a vibration structure is reversely reconstructed by using the acquired measurement result. The device comprises a base (1), a rotating shaft (2), a semicircular support (3) and a test mechanism (4). The semicircular support (3) can circumferentially rotate along with the rotating shaft (2). The test mechanism (4) is fixedly installed on the semicircular support (3) and can measure acoustic pressure information of the spherical holographic measuring surface surrounding the vibration structure (5).

Description

technical field [0001] The invention belongs to the technical field of near-field acoustic holographic testing, and relates to a near-field acoustic holographic testing method and device based on a spherical function basic solution. Background technique [0002] A key factor in noise analysis and control is accurately locating noise sources. Near-field acoustic holography (NAH: Near-field Acoustic Holography) is one of the hot spots in acoustic research in the past 30 years. Since near-field acoustic holography preserves the evanescent wave (Evanescent Wave) components as much as possible in the process of signal acquisition, the The reconstruction accuracy of the sound field greatly exceeds the Rayleigh resolution criterion, which is unmatched by beamforming and conventional acoustic holography. NAH based on the basic solution of the spherical function of the Helmholtz equation is an important method for acoustic field reconstruction. For this type of NAH, there are two p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/06G01S5/18
CPCG01H11/06G01S5/18
Inventor 吴海军蒋伟康
Owner SHANGHAI JIAOTONG UNIV
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