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A near-field acoustic holographic transformation method based on boundary element method in half-space environment

A technology of near-field acoustic holography and boundary element method, applied in the direction of constraint-based CAD, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as not considering the influence of water surface structure, and achieve the effect of improving reconstruction accuracy

Active Publication Date: 2022-08-02
HARBIN ENG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

In the above literature, only the influence of the virtual source on the sound field is considered, and the influence of the water surface on the structure is not considered
In the actual environment, when the sound source is placed near the water surface, the radiated sound field outside the noise source will have an impact on the source surface after being reflected by the water surface. Therefore, there must be a large error in the reconstruction results using the above methods

Method used

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  • A near-field acoustic holographic transformation method based on boundary element method in half-space environment
  • A near-field acoustic holographic transformation method based on boundary element method in half-space environment
  • A near-field acoustic holographic transformation method based on boundary element method in half-space environment

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Embodiment

[0168] The beneficial effects of the present invention are verified in the following manner:

[0169] (1) Under the simulation conditions of Matlab, the simulation experiment of this method is carried out:

[0170] The simulation parameters are as follows:

[0171] Model geometric parameters: spherical shell with a radius of 0.75m, the center is located at the origin of the coordinates, after dividing the grid, 218 nodes and 216 quadrilateral elements are formed;

[0172] Internal sound source parameters of the model: located at (-0.1,-0.1,0.1), point sound source, with an amplitude of 1Pa;

[0173] Fluid medium parameters: water, density 1000kg / m 3 , the speed of sound is 1500m / s

[0174] Half-space interface: the model is in water, the half-space interface is infinite, and there is air outside the interface. It can be considered that the interface reflection coefficient R=-1, and the interface is Hm from the center of the spherical shell;

[0175] Holographic measuring s...

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Abstract

The invention discloses a near-field acoustic holographic transformation method by boundary element method in a half-space environment, comprising step 1: establishing a near-field acoustic holographic measurement model in a half-space environment, and obtaining the source surface of a real sound source and a mirror image virtual source The node coordinate information of the Five: Regularization in the process of holographic reconstruction. The invention considers the half-space test environment, improves the traditional half-space boundary element method, considers the influence of the interface in the half-space on the sound pressure and vibration velocity field of the source surface, and establishes the holographic transformation matrix in the half-space environment, thereby improving the Reconstruction accuracy.

Description

technical field [0001] The invention relates to a boundary element method near-field acoustic holographic transformation method in a half-space environment, belonging to a transformation method for improving the reconstruction accuracy of sound pressure on a structure source surface in the field of acoustic holography. Background technique [0002] Near-field acoustic holography has been introduced into the fields of measurement and analysis of the radiation field of sound sources or vibrating bodies, identification and localization of noise sources, and evaluation of the intensity of structural surface sources, and has become a major research hotspot in the field of acoustics. The basic idea of ​​near-field acoustic holography is to measure the complex sound pressure information in the near field of the sound source, and reconstruct the measured complex sound pressure information according to the sound field transformation algorithm, so as to realize the sound pressure in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F17/16G06F17/11G01H17/00G06F111/04
Inventor 商德江肖妍董磊韩金风
Owner HARBIN ENG UNIV