A near-field acoustic holography method based on a combinatorial optimization regularization method

Abstract

The invention discloses a near-field acoustical holography method based on a combinatorial optimization regularization method. The sound pressure at each point measured on a holographic surface is used, based on a statistical optimal cylinder near-field acoustical holography method, the truncated singular value and standard Tikhonov combinatorial optimization regularization method are used for selected wave number vectors to suppress measurement errors of the wave number vectors caused by the noise and random errors, and that is the combinatorial optimization regularization method; by using the combinatorial optimization regularization method and a GCV method, a superposition coefficient matrix and the sound pressure at each point measured on the holographic surface are obtained, and a sound field on the surface of shell structure equipment can be obtained by expressing the sound pressure at each point on the surface of the shell structure equipment as linear superposition of the conformal measurement surface sound pressure; and effectiveness of the near-field acoustical holography method in shell radiation noise analysis is fully demonstrated, the near-field acoustical holographymethod is suitable for the cylindrical shell structure, a sound field of a cylindrical underwater vehicle is displayed visually, and thus the magnitude and distribution of a radiated sound field can be seen intuitively, so that important theoretical significance and engineering application values are achieved.

Description

technical field [0001] The invention belongs to the field of mechanical structure acoustic radiation signal processing, in particular to a near-field acoustic holography method based on a combination optimization regularization method. Background technique [0002] Underwater vehicles have large endurance, strong maneuverability, and strong independent combat capabilities, but the noise waves generated by them can be transmitted to hundreds of nautical miles in seawater, and are easily detected by local areas, which seriously weakens their acoustic stealth performance. Acoustic stealth performance is the key to ensure its safety. At present, the primary technical problem to be solved is to obtain the radiated sound field of the underwater vehicle, so as to realize the accurate evaluation of its stealth performance. However, it is difficult to accurately evaluate the acoustic stealth performance of underwater vehicle shell equipment with many internal sound sources and compl...

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Problems solved by technology

However, domestic scholars have conducted a lot of theoretical and experimental research on this method, but they often focus on the statistical optimal planar near-field acoustic holography problem. There is less research on cylindrical sound sources such as underwater vehicles, and there is a lack of acoustic discomfort for this method. Research on Qualitative Questions

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