Sound field modal analysis method based on resonance reinforcing singular value decomposition

Abstract

The invention discloses sound field modal analysis technology based on resonance reinforcing singular value decomposition. The technology is based on a sound field modal superposing principle, and decomposes the sound field radiation problem into the extraction and display problem of a plurality of sound field modals. Firstly, a certain cross section of the sound field adopts a microphone array tosynchronously detect the time domain acoustic information, and the modal formation of the sound field can be preliminarily determined through spectrum analysis, and a plurality of sound field modalsto be extracted can be determined based on demand. Secondly, the resonance reinforcing singular value decomposition method is adopted to extract the synchronous acoustic information at each test pointof the assigned modal from the time domain acoustic information. Finally, the holographic image of the sound field modal can be drafted by using a contour method in a 3D space formed by sound field space scale, time scale and amplitude scale. Compared with the prior art, the invention is advantageous in that sound source and radiation geometrical environment of any complexity can be adapted; theestablished sound field modal is complete in essential factors and visual in image.

Description

Technical field: [0001] The invention belongs to the field of sound field modal analysis, in particular to a sound field modal analysis method based on resonance enhanced singular value decomposition. Background technique: [0002] The study of sound radiation has always been a challenging subject. Similar to structural vibration modal analysis, sound field modal analysis has received extensive attention in recent years. Structural vibration modal analysis already has a complete theoretical system of methods, which promotes the development of vibration research. However, the sound field modal analysis method is not perfect enough, which hinders the development of sound radiation research. [0003] In the middle of the 20th century, Tyler and Sofrin were the first to systematically study the mechanism and influencing factors of the sound field mode of the air path of the aero-engine, which laid a theoretical foundation for the study of fan and compressor noise using the sou...

AI Technical Summary

Problems solved by technology

In the background of complex engineering noise, when there is no obvious amplitude advantage between the eigenfrequency signal and other frequency signals, the traditional singular value decomposition may decompose the eigenfrequency signal into several singular values, so that a single singular value reconstruction is used to extract There are large uncertainties in the method of eigencomponents

Images