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Method for predicting transient sound radiation noise

A prediction method and radiation noise technology, applied in special data processing applications, computer-aided design, design optimization/simulation, etc., can solve problems that do not take into account the space-time characteristics of the basic solution

Pending Publication Date: 2021-02-12
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

However, the treatment of near-singularity often does not take into account the space-time characteristics of its basic solution, and there are certain calculation errors

Method used

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  • Method for predicting transient sound radiation noise
  • Method for predicting transient sound radiation noise
  • Method for predicting transient sound radiation noise

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Embodiment Construction

[0107] The present invention will be further described below in conjunction with specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0108] like figure 1 As shown, the calculation example of the sound field of the cantilever beam structure is taken, the width of the cantilever beam is a=2, and the length b=4a. The sound pressure on the left end face is 0, the constant sound flux is loaded on the right end face, and the sound flux on the upper and lower faces is 0.

[0109] Application step 1: According to the geometric characteristic parameters of the model, a transient acoustic radiation noise calculation model is established, a=2, b=8, and the coordinates of the four points are (0,0), (8,0), (8 ,2), (0,2). The discretization of the unit is as follows: the upper discretization is 8 quadratic units, of which 2 sides are discontinuous units, 6 c...

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Abstract

According to a method provided in the invention, the time analysis integration is carried out on a basic solution of an acoustic boundary element method, the segmentation integration about time is obtained through definition of principal value integration and finite part integration, singular principal value separation is carried out on segmentation singular integration in each time period to regularize the segmentation singular integration, and segmentation analysis is carried out on the principal value integration to eliminate singularity. For the near-singular integral, the wave pitch is combined with the shortest distance from the source point to the integral unit to construct a near-singular integral solving method. According to the method, singular integration in a transient acousticboundary element method is effectively solved, and a Laplace equation basic solution does not need to be used. The near singular integral method combining the wave pitch and the shortest distance from the source point to the integral unit can effectively process the fluctuation singularity and near singularity of the transient acoustic boundary element method, improve the calculation precision and convergence of the transient acoustic boundary element method, and improve the accuracy of transient acoustic radiation noise prediction.

Description

technical field [0001] The invention relates to the field of noise prediction, in particular to the prediction of transient acoustic radiation noise. Background technique [0002] With the rapid development of my country's social economy and the acceleration of urbanization, the problem of environmental noise pollution in cities is becoming more and more serious. Environmental noise in cities mainly includes two parts: natural noise pollution and noise pollution caused by human activities. The noise caused by human activities mainly includes traffic noise, industrial noise, construction noise and social life noise. In the process of machinery manufacturing, especially in the production workshops of industrial and mining enterprises, the noise pollution generated in the process of machinery manufacturing and production processing is also relatively huge. The friction between the saw blade and the material from the sawing machine, the collision sound of the shearing machine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/10
CPCG06F30/20G06F2111/10G06F2119/10
Inventor 谢贵重钟玉东李浩杜文辽邬昌军王良文李客孙春亚王昊琪谢欢刘林王滔张世欣
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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