Complex shape sound source surface instantaneous acceleration reconstruction method

Abstract

The invention discloses a complex shape sound source surface instantaneous acceleration reconstruction method. The complex shape sound source is internally and externally provided with a hologram plane and an equivalent source plane which are conformal with the sound source, and time domain sound pressure signals on the hologram plane are acquired; according to a principle of a time domain equivalent source method, a time domain equivalent source strength is used as a medium to build the relationship between the time domain sound pressure on the hologram plane and a time domain normal acceleration of the sound source surface; the time domain sound pressure on the hologram plane and a known Green function are then used to solve all equivalent source strengths at all moments through an iterative inversion process; and the solved equivalent source strengths are finally used to calculate the normal acceleration of the sound source surface at each moment. The invention provides a non-contact instantaneous acceleration acquisition method, and influences on a sound source itself vibration mode by acceleration sensor additional mass can be avoided. The method has an ability of processing any shape sound source and can be used for complex shape structure surface instantaneous acceleration measurement in practical engineering.

Description

technical field

[0001] The invention relates to the field of noise in physics specialty, in particular to a method for reconstructing the transient acceleration on the surface of a sound source with complex shapes. Background technique

[0002] The vibration information of the structure surface can not only contribute to the structure improvement and reliability analysis, but also is an important input for the identification of the structural force source and the fault diagnosis. Usually, the acceleration sensor pasted on the surface of the structure is used to measure the surface acceleration of the structure, but the additional mass of the acceleration sensor will change the vibration mode of the structure to varying degrees, especially the vibration mode of the thin structure is greatly affected, resulting in the measured acceleration Inaccurate. Therefore, it is necessary to adopt a non-contact measurement method to obtain accurate acceleration signals. Sound originate...

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