Case equipment surface acoustic field reconstruction method based on statistical optimal near field acoustic holography

Abstract

The invention discloses a case equipment surface acoustic field reconstruction method based on statistical optimal near field acoustic holography. A measuring surface conformal with the case structureequipment is used to acquire holographic acoustic pressure, the surface acoustic field of the case structure equipment is calculated through the linear superposition of the complex acoustic pressureon the holographic surface of the spatial domain by using a statistical optimal column surface near field acoustic holography theory algorithm, and the window effect and the winding error in the nearfield acoustic holography are fundamentally solved. The method has the advantages of less number of microphones, low measurement cost, high acoustic field reconstruction efficiency, high precision andthe like. According to the method, the accurate reconstruction of the surface acoustic field of the column and column similar case structure equipment is realized, the method can be applied to underwater weapons such as a submarine, the reconstruction precision and the efficiency of the surface acoustic field of the case structure equipment can be effectively improved, the theoretical basis is provided for the acoustic stealth performance evaluation of the case structural equipment, which has important theoretical significance and engineering application value.

Description

technical field [0001] The invention belongs to the field of mechanical structure acoustic radiation signal processing, and in particular relates to a method for reconstructing surface acoustic fields of shell equipment based on statistical optimal near-field acoustic holography. Background technique [0002] As naval combat equipment, the shell mechanical system of submarines and other shell structures has the characteristics of excellent concealment, large endurance, long self-sustainability, good maneuverability and strong independent combat capability, and is favored by the world's navies. However, the noise waves emitted by mechanical equipment and other shell structure equipment such as submarines can travel tens or even thousands of nautical miles in the water, and are easily detected by the enemy, which seriously weakens their acoustic stealth performance and reduces their combat performance. In order to improve the acoustic stealth performance and combat performance...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional NAH uses the spatial two-dimensional Fourier transform to realize the deconvolution operation to obtain the reconstructed surface sound pressure. However, since the actual holographic surface complex sound pressure is discretely measured on a limited measurement area with a limited measurement aperture, and in the process of numerical reconstruction , the discrete Fourier transform is used to realize the deconvolution operation, which will bring window effects and winding errors in the holographic calculation process, so the test aperture area is required to be at least twice the sound source area. For large-scale shells such as submarines Accurate testing to meet NAH requirements is almost impossible

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