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Method for reconstructing sound source direct radiation sound field in semi-open space

A half-open, half-space technology, used in instruments, measurement devices, radio wave measurement systems, etc.

Pending Publication Date: 2022-05-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The half-space acoustic field reconstruction method based on Fourier acoustics is only applicable to the case where the holographic measurement surface is a regular geometric shape (plane, cylinder or sphere).

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  • Method for reconstructing sound source direct radiation sound field in semi-open space
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  • Method for reconstructing sound source direct radiation sound field in semi-open space

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Embodiment Construction

[0076] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0077] The implementation of the method for reconstructing the direct radiation sound field of a sound source in a semi-open space of the present invention is carried out according to the following steps:

[0078] Step 1, establish a sound field mathematical model based on the superposition of the half-space spherical wave basis functions.

[0079] like figure 1 and figure 2 shown, with the sound source geometric center O 1 The projection O on the boundary establishes the global coordinate system as the origin, O 1 The global coordinates of are marked as h s for O 1 distance to the boundary; O 1 The mirror point about the boundary is denoted as O 2 . By translating the global coordinate system to O 1 and O 2 A local coordinate system is established for the origin respectively, and the coordinates of the field point x in the two local coordin...

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Abstract

A method for reconstructing a sound source direct radiation sound field in a semi-open space is a method for reconstructing a sound source direct radiation sound field in a semi-open space containing a plane reflection boundary, and comprises the following steps: 1, establishing a mathematical model for expressing a total sound pressure field contributed by sound source direct radiation and boundary reflection sound through linear superposition of a semi-space spherical wave basis function; 2, arranging a holographic measurement surface in a sound source near field to carry out sound pressure holographic measurement; 3, the holographic measurement values of part of the measurement points serve as input, sound pressure values of other measurement points are reconstructed, and the optimal primary function expansion term number is determined with the principle that the sound pressure reconstruction error is minimum; and 4, solving the half-space spherical wave primary function coefficient under the condition of the optimal expansion term number, obtaining the free-space spherical wave primary function coefficient expressing the sound field directly radiated by the sound source, and realizing the reconstruction of the sound field directly radiated by the sound source. According to the invention, a mathematical basis is provided for measurement and evaluation of radiation of a large-size structural sound source, and sound field imaging and structural sound source identification and positioning in a semi-open space can be realized.

Description

Technical field: [0001] The invention relates to a method for obtaining the direct radiated acoustic quantity distribution of the sound source by measuring the total acoustic quantity distribution superimposed by the direct radiation of the sound source and the reflection from the planar boundary by using a sensor array in a semi-open space containing a plane reflection boundary. It belongs to the technical fields of sound source identification and positioning, sound field imaging, near-field sound holography, sound wave separation and noise control. Background technique: [0002] The measurement and evaluation of the acoustic quantity radiated by a sound source generally needs to be carried out in a fully anechoic or semi-anechoic standard environment. For large-scale, complex equipment, there is often no such ideal acoustic measurement environment. For example, acoustic radiation testing of large ships can usually only be performed in docks or piers where reflection bound...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/20
CPCG01S5/20
Inventor 周达仁卢奂采程相乐汝泽宇
Owner ZHEJIANG UNIV OF TECH