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Sound field reconfiguration method for rapid noise diagnosis

A sound field reconstruction and noise technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the error of reconstructed pulsating spherical sound field, low reconstruction efficiency of non-spherical sound source sound field, large calculation error, etc. problems, to achieve high efficiency, broaden the application field of computing, and reduce computing time.

Inactive Publication Date: 2005-09-14
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The problem with this method is that when the independent function is not selected properly or the measurement points with different radii are selected, there will be a large error in reconstructing the sound field of the pulsating ball using the HELS method
The reconstructed point is required to be very close to the measured point, and it is difficult to reconstruct the sound field of an ordinary spherical sound source using the HELS method. For non-spherical sound sources, the calculation error is large
This method is not suitable for high frequencies, and the efficiency of sound field reconstruction for aspheric sound sources is very low

Method used

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  • Sound field reconfiguration method for rapid noise diagnosis
  • Sound field reconfiguration method for rapid noise diagnosis
  • Sound field reconfiguration method for rapid noise diagnosis

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Embodiment Construction

[0031] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, a long rotating ellipsoid sound source, in the ellipsoidal coordinate system, its major axis and minor axis are 1 and 0.5 meters respectively, on the ellipsoid surface with the radius of 3 meters and 9 meters in the sound field, along the angular direction θ Starting from 4.5 degrees, select a measurement point every 9 degrees. There are 80 measurement points in total, and the sound pressure of 80 measurement points is known.

[0033] According to the sound pressure of these 80 measurement points, the process of reconstructing the sound pressure of the entire sound field is as follows:

[0034] 1. Establish an ellipsoidal coordinate system

[0035] Establish a two-dimensional ellipsoidal coordinate system with a major axis of 1 meter and a minor axis of 0.5 meters. Among them, the corresponding relatio...

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Abstract

The method divides sound field into a numbers of regions and to present sound field at each region as linear superposition of region node sound pressure according to sound pressure at several known measuring points in certain sound field of known sound source shape. The regional node sound pressure can be obtained according to sound pressure of measuring point through least square method and singular value decomposition, and then sound pressure for the complete sound field can be rebuilt through sound pressure of regional node. The method is more accurate and efficient than HELS method in describing sound field.

Description

Technical field [0001] The present invention relates to a sound field reconstruction method, in particular to a sound field reconstruction method for fast noise diagnosis that can accurately reconstruct other point information based on the information of a few points measured in the sound field, which belongs to the noise diagnosis technology field. Background technique [0002] In noise fault diagnosis, only a few noise signals may be measured. How to approximate unknown signals in the sound field based on these few known signals in a short period of time has attracted the attention of many scholars. [0003] Using calculation methods such as near-field holography and boundary elements for noise diagnosis generally takes a lot of time or costs a lot. In 1997, Wang et al. proposed to use the HELS method, and in 1998, 2000, and 2001, they used simulation calculations and experimental studies to verify the HELS method. The HELS method is very efficient in reconstructing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 杨瑞梁汪鸿振
Owner SHANGHAI JIAO TONG UNIV
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