Acoustic scattering from a cylindrical shell with an internal rigid plate: Analysis and experiment

2018 ◽  
Vol 143 (6) ◽  
pp. 3332-3344 ◽  
Author(s):  
Yunzhe Tong ◽  
Jun Fan ◽  
Bin Wang
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Scattering ◽  
Rigid Plate ◽  
Plate Analysis

scholarly journals Simulation and analysis on low-frequency scattering characteristics of the finite cylindrical shell in shallow water

2019 ◽  
Vol 283 ◽  
pp. 03007
Author(s):  
Jinyu Li ◽  
Dejiang Shang ◽  
Yan Xiao
Keyword(s):  
Cylindrical Shell ◽  
Free Space ◽  
Acoustic Scattering ◽  
Low Frequency ◽  
Target Strength ◽  
Wave Direction ◽  
Scattering Field ◽  
Simulation Results ◽  
Finite Cylindrical Shell ◽  
Target Locations

Low-frequency acoustic scatterings from a finite cylindrical shell are numerically analyzed by FEM. The simulation results show that the acoustic-scattering field in waveguide has lots of frequency-related sidelobes, while no sidelobes exist in free space at low frequencies. The simulation also indicates that the module value in waveguide can be almost 20 dB larger than that in free space at low frequency, which is caused by the ocean boundaries. We also demonstrate that when the incident wave direction is normal to the target at low frequency, the target strength will be maximum and the distribution of the acoustic-scattering field is axisymmetric about the incident waving direction. Meanwhile, the acoustic-scattering field is also related to the impedance of the seabed, and the change of the impedance makes just a little contribution to the scattering field. Finally, the influence of different target locations is analyzed, including the targets near the sea surface, seabed and the middle region of the ocean waveguide, respectively. From simulation results, it is evident that the distribution of the acoustic-scattering field at low frequency has a little difference, which is smaller than 0.5 dB with various target locations, and the change is frequency and boundary-related.

Analysis of the acoustic scattering at variable incidences from an extra thin cylindrical shell bounded by hemispherical endcaps

2000 ◽  
Vol 108 (5) ◽  
pp. 2187-2196 ◽  
Author(s):  
N. Touraine ◽  
L. Haumesser ◽  
D. Décultot ◽  
G. Maze ◽  
A. Klauson ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Scattering ◽  
Thin Cylindrical Shell

scholarly journals Acoustic scattering from a finite quasi-periodic bulkhead cylindrical shell

2013 ◽  
Vol 62 (2) ◽  
pp. 024301
Author(s):  
Pan An ◽  
Fan Jun ◽  
Zhuo Lin-Kai
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Scattering

A0-Wave and A-Wave in Cylindrical Shell Immersed in Water: Influence on the Acoustic Scattering

1999 ◽  
Author(s):  
Gérard Maze ◽  
Nicolas Touraine ◽  
André Baillard ◽  
Dominique Decultot ◽  
Véronique Latard ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Lamb Wave ◽  
High Speed ◽  
Acoustic Scattering ◽  
Stoneley Wave ◽  
High Speed Camera ◽  
Low Frequencies ◽  
Schlieren Visualization ◽  
The Subject ◽  
Structure Inhomogeneity

Abstract In low frequencies (ka < 200), the A-wave (Scholte-Stoneley wave) and the S0-wave (first symmetrical Lamb wave) are the subject of a particular attention in the study of the acoustic scattering from empty cylindrical shells immersed in water. If the tube is in water, the A0-wave (flexural Lamb wave) which circumnavigates in the shell in vacuum, does not originate resonances in the backscattered pressure spectrum while the two others are active. Images of the acoustic scattering from cylindrical or spherical targets obtained from the “Schlieren” visualization using a high-speed camera show the typical re-radiation of the A0+-wave in water. Moreover, the backscattered signal recorded with one emitter-receiver transducer shows one echo which cannot attributed to the A- or S0-waves. In this paper, the propagation of the A0+-wave has been especially studied to explain the experimental results. This A0+-wave has a great impact if it crosses over a structure inhomogeneity after a short propagation in the shell, before its complete attenuation.

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