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Real-time sound field separating method for measuring by adoption of single-side sound pressure and vibration velocities

A separation method, a technology of sound pressure time domain, applied in the field of noise

Inactive Publication Date: 2013-08-28
HEFEI UNIV OF TECH
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Problems solved by technology

However, the above-mentioned sound field separation methods only realize the sound field separation under a single frequency or frequency band.
If you want to achieve sound field separation at any time, the above sound field separation method is no longer applicable

Method used

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  • Real-time sound field separating method for measuring by adoption of single-side sound pressure and vibration velocities
  • Real-time sound field separating method for measuring by adoption of single-side sound pressure and vibration velocities
  • Real-time sound field separating method for measuring by adoption of single-side sound pressure and vibration velocities

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Embodiment Construction

[0083] see figure 1 , this embodiment uses the real-time sound field separation method of single-sided sound pressure and vibration velocity measurement to separate the target sound source M according to the following steps o The sound pressure time-domain signal radiated on the measurement plane S alone:

[0084] Step a, at the target sound source M o and interfering sound source M d A measurement plane S is arranged between them; the target sound source M o and interfering sound source M d Any linear sound field signal can be radiated; M measurement grid points are evenly distributed on the measurement plane S, and the coordinates of the grid points are represented by (x, y); each grid point (x, y) on the measurement plane S is collected synchronously Sound pressure time-domain signal p(x,y,t) and vibration velocity time-domain signal v(x,y,t) at the place;

[0085] Step b. Perform two-dimensional spatial Fourier transform on the sound pressure time-domain signal p(x, y...

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Abstract

The invention discloses a real-time sound field separating method for measuring by the adoption of single-side sound pressure and vibration velocities. The real-time sound field separating method for measuring by the adoption of the single-side sound pressure and the vibration velocities is characterized in that a measuring plane is arranged between a target sound source and an interface sound source, and sound pressure time-domain signals and vibration velocity time-domain signals of grid points on the measuring plane are synchronously collected; two-dimensional space Fourier transform is respectively conducted on the sound pressure time-domain signals and the vibration velocity time-domain signals to acquire sound pressure time-domain wave number spectra and vibration velocity time-domain wave number spectra of wave numbers; then sound pressure time-domain wave number spectra independently radiated on the measuring plane by the target sound source are timely separated through the sound pressure time-domain wave number spectra, the vibration velocity time-domain wave number spectra and a known time-domain impulse response function, and accordingly sound pressure time-domain signals independently radiated on the measuring plane by the target sound source are acquired. Only one measuring plane is needed, a deconvolution process does not exist, and therefore the real-time sound field separating method for measuring by the adoption of the single-side sound pressure and the vibration velocities is simple in achieving mode, high in stability and capable of being used for conducting field analyses of the time-varying radiation characteristic of the target sound source under the noise interference environment.

Description

technical field [0001] The invention relates to a sound field separation method in the field of noise in the specialty of physics. Background technique [0002] In actual engineering, the target sound source is located on one side of the measurement plane, and there are often interfering sound sources on the other side of the measurement plane. The sound field generated by these interfering sound sources affects the accurate measurement of the sound field radiated by the target sound source. Therefore, it is necessary to adopt a certain sound field separation method to separate the influence of the interfering sound source from the measurement results. So far, scholars at home and abroad have proposed a variety of sound field separation methods, which can be roughly divided into five categories: One is the sound field separation technology based on the spatial Fourier transform (SFT): G.V.Frisk et al. first proposed in 1980 to use The SFT method indirectly measures the refl...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 毕传兴张小正耿林
Owner HEFEI UNIV OF TECH
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