Sound Radiation From a Finite Cylindrical Shell Covered With a Compliant Layer

1991 ◽  
Vol 113 (2) ◽  
pp. 267-272 ◽  
Author(s):  
B. Laulagnet ◽  
J. L. Guyader
Keyword(s):  
Cylindrical Shell ◽  
Frequency Domain ◽  
Mathematical Analysis ◽  
Strong Influence ◽  
Sound Radiation ◽  
Radiated Power ◽  
Shell Motion ◽  
Compliant Layer ◽  
Finite Cylindrical Shell ◽  
Large Frequency

The aim of this work is to present the mathematical analysis and numerical results about sound radiation from a finite cylindrical shell covered with a compliant layer, immersed in water. The shell motion is obtained using Flu¨gge’s operator whereas the layer is described by a locally reacting material. The results are presented both in shell radial quadratic velocity and radiated power. Two major conclusions can be drawn when looking at results: (1) a reasonable stiffness layer allows one to reduce the radiated power in a large frequency domain; (2) the layer has a strong influence on the shell velocity which exhibits an antiresonance phenomenon when covered.

Investigation on Vibro-Acoustic Characteristics from Submerged Cylindrical Shell with Double Damping Layers

2013 ◽  
Vol 345 ◽  
pp. 94-98
Author(s):  
Chao Zhang ◽  
De Jiang Shang ◽  
Qi Li
Keyword(s):  
Cylindrical Shell ◽  
Low Frequency ◽  
Acoustic Characteristics ◽  
Radiated Power ◽  
Shell Models ◽  
Antiresonance Frequency ◽  
Shell Motion ◽  
Vibration And Sound Radiation ◽  
Thin Shell Theory ◽  
Large Frequency

The vibration and sound radiation from submerged cylindrical shell with double damping layers are presented. The cylindrical shell motion was described with classical thin shell theory. The double damping layers motion was described with the Navier viscoelasticity theory. For different Youngs modulus parameters of double damping layers, the sound radiated power and the radial quadratic velocity of cylindrical shell models were calculated and analyzed. The results show that the sound radiated power and radial quadratic velocity are reduced to varying degrees due to double damping layers in a large frequency domain except low frequency. The double damping layer with soft inner layer and hard outer layer can make the sound radiated peaks move to high frequency, can help to reduce the radial quadratic velocity on outer surface of damping layer, and can help to reduce the vibration of model at antiresonance frequency.

Vibrational and acoustic radiation from a submerged periodic cylindrical shell with axial stiffening

2009 ◽  
Vol 223 (5) ◽  
pp. 1083-1089 ◽  
Author(s):  
C-J Liao ◽  
W-K Jiang ◽  
H Duan ◽  
Y Wang
Keyword(s):  
Cylindrical Shell ◽  
Analytical Study ◽  
Acoustic Radiation ◽  
Sound Radiation ◽  
Mechanical Impedance ◽  
Stiffened Cylindrical Shell ◽  
Reaction Forces ◽  
Radial Forces ◽  
Vibration And Sound Radiation ◽  
Finite Cylindrical Shell

An analytical study on the vibration and acoustic radiation from an axially stiffened cylindrical shell in water is presented. Supposing that the axial stiffeners interact with the cylindrical shell only through radial forces, the reaction forces on the shell from stiffeners can be expressed by additional impedance. The coupled vibration equation of the finite cylindrical shell with axial stiffening is derived; in this equation additional impedance caused by the axial stiffeners is added. As a result, the vibration and sound radiation of the shell are dependent on the mechanical impedance of the shell, the radiation sound impedance, and the additional impedance of the axial stiffeners. Based on the numerical simulation, it is found that the existence of axial stiffeners decreases the sound radiation and surface average velocity, whereas it increases the radiation factor. The characteristics of the acoustic radiation can be understood from the simulation with good results, which show that the presented methodology can be used to study the mechanism of the acoustic radiation of the complicated cylindrical shell and to optimize its design.

scholarly journals Sound radiation from finite cylindrical shell excited by inner finite-size sources

2018 ◽  
Vol 67 (24) ◽  
pp. 244301
Author(s):  
Yang De-Sen ◽  
Zhang Rui ◽  
Shi Sheng-Guo
Keyword(s):  
Cylindrical Shell ◽  
Finite Size ◽  
Sound Radiation ◽  
Finite Cylindrical Shell

Sound radiation from a finite cylindrical shell with an irregular-shaped acoustic enclosure

2017 ◽  
Vol 142 (4) ◽  
pp. 2687-2687 ◽  
Author(s):  
Desen Yang ◽  
Rui Zhang ◽  
Shengguo Shi ◽  
Tengjiao He
Keyword(s):  
Cylindrical Shell ◽  
Sound Radiation ◽  
Finite Cylindrical Shell

Acoustic Radiated Calculation of a Finite Cylindrical Shell and Interface Design of the Programs

2011 ◽  
Vol 378-379 ◽  
pp. 39-42
Author(s):  
Fei Fei Qiu ◽  
Xiao Wei Liu ◽  
Huan Wen Shi ◽  
Yong Wang
Keyword(s):  
Cylindrical Shell ◽  
Driving Force ◽  
Radiation Power ◽  
Cylindrical Shells ◽  
Sound Radiation ◽  
Sound Field ◽  
Directivity Pattern ◽  
Radiation Impedance ◽  
Simply Supported ◽  
Finite Cylindrical Shell

Based upon the vibratory equation and sound radiation impedance of a cylindrical shell, the sound field distribution of a finite cylindrical shell simply-supported at two infinite rigid cylindrical shells were resolved with considering the structural loss. An interface containing some buttons connected with all the programs was designed by using Matlab, and their data were all stored in a file. It has been shown that the sound radiation power of the cylindrical shell decreases and the radiation efficiency increases with increasing of structural damping loss factors; when the frequency of the driving force is low, the sound field shapes “∞” directivity pattern; When the frequency of the driving force grows higher the sound directivity pattern becomes complex due to superposition of axial modes and circumferential modes; Only when the radiation of the end plates is much weaker than the cylindrical shell the analytical results of the shell simply-supported at two infinite rigid cylindrical shells can be utilized to illustrate the sound radiation by a finite cylindrical shell with two end plates.

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