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| A study on sound field prediction of underwater vehicles based on a modal superposition method |
| ZHOU Sitong1,2,3,SHUAI Changgeng1,2,YANG Jiaxuan4 |
1．Institute of Noise ＆ Vibration，Naval University of Engineering，Wuhan 430033，China；
2．National Key Lab on Ship Vibration ＆ Noise，Wuhan 430033，China；
3．Unit 92337 of the PLA，Dalian 116023，China；
4．Navy Submarine Academy，Qingdao 266199，China |
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Abstract In order to predict the radiation sound field of a finite cylinder through discrete sound pressure or velocity data on a cylindrical surface, a sound field prediction algorithm based on the modal superposition method was proposed.In the method, the radial vibration of the finite cylindrical shell was represented by axial and circumferential modes, and then a transfer function matrix was built between each mode and holographic surface.The modal coefficients were determined by matching the holographic surface sound pressure or vibration velocity.In addition, small amount of far-field sound pressure data was used to perform parameter matching in the sense of least-squares to obtain the optimal axial and circumferential modal order, and finally the prediction of the radiation sound field was realized.Numerical simulations and experiments of point source, cylinder source and ship model were used to demonstrate the validity and applicability of the approach.Results of both the numerical simulations and the anechoic chamber experiment show that compared with the statistically optimized near-field acoustical holography, the proposed technology can realize the sound field prediction outside the holographic aperture, which is suitable for the radiation acoustic field analysis of the finite long cylinder.
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Received: 04 June 2018
Published: 15 December 2019
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