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Research Papers

Prediction of Far-Field Sound Pressure of a Semisubmerged Cylindrical Shell With Low-Frequency Excitation

[+] Author and Article Information
T. Y. Li

School of Naval Architecture
and Ocean Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China
e-mail: ltyz801@hust.edu.cn

P. Wang

School of Naval Architecture and
Ocean Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China
e-mail: paulwang@hust.edu.cn

X. Zhu

School of Naval Architecture and
Ocean Engineering,
Huazhong University of Science
and Technology,
Wuhan 430074, China
e-mail: zhuxiang@hust.edu.cn

J. Yang

Department of Mechanical, Materials
and Manufacturing Engineering,
University of Nottingham Ningbo China,
Ningbo 315100, China
e-mail: jian.yang@nottingham.edu.cn

W. B. Ye

No. 1 Department,
Wuhan Second Ship Design and
Research Institute,
Wuhan 430074, China
e-mail: 1025500148@qq.com

1Corresponding author.

Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received January 31, 2016; final manuscript received February 13, 2017; published online May 30, 2017. Assoc. Editor: Marco Amabili.

J. Vib. Acoust 139(4), 041002 (May 30, 2017) (9 pages) Paper No: VIB-16-1060; doi: 10.1115/1.4036209 History: Received January 31, 2016; Revised February 13, 2017

A sound–structure interaction model is established to study the vibroacoustic characteristics of a semisubmerged cylindrical shell using the wave propagation approach (WPA). The fluid free surface effect is taken into account by satisfying the sound pressure release condition. Then, the far-field sound pressure is predicted with shell's vibration response using the stationary phase method. Modal coupling effect arises due to the presence of the fluid free surface. New approaches are proposed to handle this problem, i.e., diagonal coupling acoustic radiation model (DCARM) and column coupling acoustic radiation model (CCARM). New approaches are proved to be able to deal with the modal coupling problem efficiently with a good accuracy at a significantly reduced computational cost. Numerical results also indicate that the sound radiation characteristics of a semisubmerged cylindrical shell are quite different from those from the shell fully submerged in fluid. But the far-field sound pressure of a semisubmerged shell fluctuates around that from the shell ideally submerged in fluid. These new approaches can also be used to study the vibroacoustic problems of cylindrical shells partially coupled with fluid.

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Figures

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Fig. 1

Cylindrical shell semisubmerged in fluid and the coordinate system

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Fig. 2

Convergence analysis on far-field SPL at typical dimensionless frequencies

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Fig. 3

Convergence of relative truncation error at typical dimensionless frequencies

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Fig. 4

Comparative analysis on far-field SPL from the ECARM and available work for a semisubmerged cylindrical shell: (a) spectral distribution and (b) circumferential distribution

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Fig. 5

Comparative analysis on far-field SPL from a semisubmerged cylindrical shell with three different methods

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Fig. 6

Spectral distribution of far-field SPL from a semisubmerged cylindrical shell

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Fig. 7

Circumferential distribution of far-field SPL from a semisubmerged cylindrical shell at Ω = 0.3

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Fig. 8

Circumferential distribution of far-field SPL from a semisubmerged cylindrical shell at Ω = 1.2

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Fig. 9

Circumferential distribution of far-field SPL from a semisubmerged cylindrical shell at Ω = 3.0

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