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Multilayer stereoscopic grid array for recognizing noise source in a beam shaping method

A three-dimensional grid and beamforming technology, which is used in beacon systems using ultrasonic/sonic/infrasonic waves, vibration measurement in solids, measurement of vibration and other directions, which can solve problems such as increasing the number of microphones and reduce grating lobes and ghosts. effect, increased resolution, simple effect to achieve

Inactive Publication Date: 2009-08-26
HEFEI UNIV OF TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to avoid the disadvantages of the above-mentioned prior art, and to layer the grid array on the premise of not increasing the number of microphones, so as to provide an Multi-layer Stereo Grid Array for Beamforming Noise Source Identification

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  • Multilayer stereoscopic grid array for recognizing noise source in a beam shaping method
  • Multilayer stereoscopic grid array for recognizing noise source in a beam shaping method
  • Multilayer stereoscopic grid array for recognizing noise source in a beam shaping method

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Embodiment Construction

[0023] see figure 1 , Figure 2a and Figure 2b , in this embodiment, the object M to be measured is an engine, and its surface P to be reconstructed is a plane, and a total of 7×7 microphones C are distributed in a 4-layer three-dimensional grid structure, and all microphones are distributed on four sides of a quadrangular pyramid ( Such as Figure 2b shown), the projections of all the microphones on the bottom of the pyramid are arranged in a plane grid (such as Figure 2a shown), in the projected plane grid, the number of microphones in the x and y directions is 7, and in the x and y directions, the distance between two adjacent microphones is 0.15m, and the distance between two adjacent layers Also 0.15m. The array is used to measure the sound pressure signal radiated by the sound source in the sound field, and then the sound pressure signal picked up by each microphone is calculated by using the beamforming method to reconstruct the sound pressure distribution on the ...

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Abstract

Multilayer stereoscopic grid array for recognizing noise source in a beam shaping method is characterized in that: a group of microphones adopts the multilayer stereoscopic grid structure distribution in such a manner that the microphones are distributed on four sides of a rectangular pyramid, wherein, the projections of the microphones onto the bottom of the rectangular pyramid are arranged in plane grid. Sound pressure signal picked up by each microphone can be calculated in a beam shaping method to rebuild the sound pressure of the source area. The invention is simple in implement method without increasing the number of the microphones; compared with a plane grid array, the aim of discretization can be achieved, influence of grating lobe and virtual image is reduced, meanwhile, resolution of recognizing the noise source can be improved.

Description

technical field [0001] The invention relates to an array for measuring acoustic signals, in particular to a multi-layer three-dimensional grid array for identifying noise sources by beamforming methods. Background technique [0002] Noise source identification and location technology is of great significance in noise control and acoustic fault diagnosis. Controlling noise from the source can reduce the workload of noise control, and has a direct effect on promoting the design and manufacture of low-noise products and improving product quality and life. Effect. Common noise source identification and localization techniques include sound pressure method, sound intensity method, near-field acoustic holography (NAH), beamforming method (Beamforming) and so on. The sound intensity method is mainly used to locate the low-frequency noise source, while the sound pressure method is usually used for the rough location of the noise source. Acoustic holography technology is relatively...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/74G01H1/00
Inventor 毕传兴张永斌徐亮张金圈陈心昭
Owner HEFEI UNIV OF TECH
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