Acoustic scattering by a cylindrical shell with symmetric line constraints in the heavy fluid-loading limit

2003 ◽  
Vol 113 (1) ◽  
pp. 299-308 ◽  
Author(s):  
E. A. Skelton
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Scattering ◽  
Fluid Loading ◽  
Heavy Fluid ◽  
Symmetric Line

Acoustic scattering by a finite elastic plate connecting two fluid-loaded parallel plates

1993 ◽  
Vol 443 (1918) ◽  
pp. 429-444 ◽  
Keyword(s):  
Elastic Plate ◽  
Acoustic Scattering ◽  
Elastic Plates ◽  
Parallel Plates ◽  
Fluid Loading ◽  
Heavy Fluid ◽  
Low Frequencies ◽  
Plane Sound ◽  
Two Fluid ◽  
Good Agreement

A plane sound wave is incident upon two infinite parallel elastic plates which are connected by a finite elastic plate. All three plates support compressional and bending motion, and interact with any compressible fluid with which they are in contact. A method, which can be applied to obtain numerical results, for calculating the sound scattered by the connecting plate is presented. In the absence of fluid between the plates an approximate solution, valid for low frequencies and heavy fluid-loading on the upper plate, has been derived which exhibits good agreement with results obtained numerically.

Acoustic scattering by parallel plates with a single connector

1990 ◽  
Vol 427 (1873) ◽  
pp. 401-418 ◽  
Keyword(s):  
Sound Wave ◽  
Parallel Plate ◽  
Formal Solution ◽  
Acoustic Scattering ◽  
Parallel Plates ◽  
Fluid Loading ◽  
Heavy Fluid ◽  
Plate Spacing ◽  
Plane Sound

A plane sound wave is incident upon one of two infinite parallel plates that are constrained along a line by a mechanical connector, which is simply hinged to both plates and which can support compressional motion. A formal solution is obtained and investigated for the cases where the plate upon which the sound wave is incident is subjected to heavy fluid loading while the parallel plate is subjected to light fluid loading and the fluid between the plates is either light or heavy. When the plates are separated by heavy fluid the additional limits of large and small plate spacing are used.

Acoustic scattering by parallel plates with periodic connectors

1990 ◽  
Vol 427 (1873) ◽  
pp. 419-444 ◽  
Keyword(s):  
Exact Solution ◽  
Half Space ◽  
Sound Wave ◽  
Fourier Transforms ◽  
Acoustic Scattering ◽  
Parallel Plates ◽  
Fluid Loading ◽  
Heavy Fluid ◽  
Plane Sound

The scattering of a plane sound wave by two infinite, elastic, parallel plates constrained by equally spaced, identical, mechanical line connectors, which can support only compressional motion and which are simply hinged to both plates, is investigated using Fourier transforms. A formally exact solution is obtained and investigated asymptotically when the only fluid present occupies the half-space from which the sound wave is incident and provides heavy fluid loading to the plate, and likewise when this fluid also occupies the space between the plates. Conditions for resonant behaviour are also examined in these limits.

Vibrations of a heavily fluid-loaded, semi-infinite, cylindrical elastic shell. II

1987 ◽  
Vol 414 (1847) ◽  
pp. 371-387 ◽  
Keyword(s):  
Exact Solution ◽  
Cylindrical Shell ◽  
Acoustic Wave ◽  
Elastic Shell ◽  
Sound Field ◽  
Elastic Cylindrical Shell ◽  
Fluid Loading ◽  
Heavy Fluid ◽  
Short Waves ◽  
Inviscid Compressible Fluid

A semi-infinite elastic cylindrical shell is rigidly bonded to a semi-infinite cylindrical rigid duct; the whole being totally immersed in an inviscid, compressible fluid. The system is forced by means of a plane acoustic wave incident along the duct. An exact solution for the resulting sound field is obtained by using the Wiener-Hopf technique. The asymptotic limit of heavy fluid loading and short waves is used to interpret this.

A hybrid method for predicting heavy fluid loading of structures

2015 ◽  
Vol 137 (4) ◽  
pp. 2324-2324
Author(s):  
Micah R. Shepherd ◽  
John B. Fahnline
Keyword(s):  
Hybrid Method ◽  
Fluid Loading ◽  
Heavy Fluid

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.

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