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Method for reestablishing transient sound field

A sound field reconstruction and transient technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc.

Inactive Publication Date: 2012-09-26
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Blais et al. proposed to use Laplace transform to realize time-domain holographic reconstruction, but this method requires that the sound source surface is only a plane

Method used

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  • Method for reestablishing transient sound field
  • Method for reestablishing transient sound field
  • Method for reestablishing transient sound field

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Embodiment Construction

[0106] see figure 1 , in this embodiment, in the measured sound field formed by the sound source surface S, a holographic surface H is arranged; M measuring points are uniformly distributed on the holographic surface H; M microphones are used to simultaneously measure each measuring point on the holographic surface H The sound pressure in the time domain; there is a virtual source surface S inside the sound source surface S * , on the virtual source surface S * There are N time-domain equivalent sources arranged on the surface; the number of measuring points M on the holographic surface H is not less than the virtual source surface S * The equivalent source number N in the upper time domain.

[0107] Transient sound field reconstruction is carried out as follows:

[0108] Step a, measure the time-domain sound pressure on the holographic surface H

[0109] In the measured sound field radiated by the sound source surface S, a holographic surface H is arranged; M measuring po...

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Abstract

The invention discloses a method for reestablishing a transient sound field. The method is characterized by comprising the following steps of: setting a holographic surface H in a sound field to be measured, and uniformly distributing M measuring points on the holographic surface H; synchronously measuring sound pressure signals of the M measuring points positioned on the holographic surface H toobtain the time domain sound pressure of the M measuring points by adopting M microphones; setting a virtual source surface S<*> within a sound source surface S, and distributing N time domain equivalent sources on the virtual source surface S<*>; carrying out interpolation processing on the time domain sound pressure of the M measuring points by adopting linear interpolation functions, and establishing the transitive relation between the time domain sound pressure of the M measuring points positioned on the holographic surface H and M time domain equivalent sources at any time; starting to sequentially acquiring the source intensity of the time domain equivalent sources at corresponding times from an initial time; and reestablishing the time domain sound pressure of any field point according to the acquired source intensity of the time domain equivalent sources at all times and the transitive relation between the time domain equivalent sources and any field point. The method disclosed by the invention has the advantages of good computational stability, high accuracy, high speed and easiness for implementation and is especially suitable for reestablishing the transient sound fieldgenerated under the action of transient exciting force.

Description

technical field [0001] The invention relates to a transient sound field reconstruction method suitable for transient sound field reconstruction generated by noise sources. Background technique [0002] When calculating the three-dimensional radiated sound field and scattered sound field, the most commonly used method is the boundary element method BEM, but the BEM method has the problems of difficulty in singular integral processing and non-uniqueness of solutions at characteristic frequencies. In order to find new alternative methods, various methods have appeared in the past 20 years, such as wave superposition method, basic solution method, sound source simulation method, equivalent source method, etc., these methods have a common idea, that is, through the The external sound field of the sound source can be approximated by placing a virtual source satisfying the given boundary conditions inside. Similarly, the internal sound field of the sound source can also be approxim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 毕传兴张小正张永斌徐亮
Owner HEFEI UNIV OF TECH
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