Cylindrical shell sound field step-by-step combination reconstruction method based on plane testing

Abstract

The invention discloses a cylindrical shell sound field step-by-step combination reconstruction method based on plane testing. The method comprises the following steps: establishing an optimal intermediate conversion surface conformal with a to-be-measured cylindrical shell sound source; on the basis of statistics of an optimal near-field acoustic holography theory, reasonably selecting a conformal conversion surface with the minimum total reconstruction error of primary reconstruction of a plane wave function; converting plane test sound pressure data into a cylindrical conformal conversion surface by utilizing statistical optimal plane near-field acoustic holography; and calculating the sound pressure of the cylindrical sound source by utilizing the statistical optimal cylindrical surface near-field acoustical holography and the sound pressure of the conversion surface. The characteristics that a plane wave function has a relatively simple requirement on a holographic surface test and a cylindrical wave function has higher reconstruction precision on a sound field of a cylindrical shell structure are combined, the limitation that data acquisition is difficult due to the fact thata holographic surface and a sound source surface are required to be conformal in a traditional method is broken through, high-precision reconstruction of the sound field of the cylindrical shell structure is achieved, the reconstruction precision of the cylindrical shell structure is improved, and the problem that the holographic surface conformal with the shell structure is difficult to arrangein actual testing is solved.

Description

technical field [0001] The invention belongs to the field of acoustic radiation signal processing of mechanical structures, in particular to a step-by-step combination and reconstruction method of sound field of cylindrical shell based on plane test. Background technique [0002] High-end equipment generally has extremely high requirements on equipment vibration and noise, among which cylindrical shell structures are very common in large-scale high-end equipment, and high-end equipment such as aircraft, rockets, and underwater vehicles are based on cylindrical shell structures main body. The primary condition for vibration and noise reduction of cylindrical shell structure equipment is to accurately obtain the radiation sound field of the mechanical structure. Statistical optimal near-field acoustic holography (SONAH) is a typical method to obtain the sound field of the sound source, especially for large mechanical structures, the holographic surface with a smaller test ape...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a step-by-step combined reconstruction method for the sound field of a cylindrical shell based on a plane test, so as to overcome the problem of insufficient sound field reconstruction accuracy caused by the test method in the actual application of the existing statistical optimal near-field acoustic holography

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