Forced vibroacoustic response of a cylindrical shell in an underwater acoustic waveguide

Kha, Jamie; Karimi, Mahmoud; Maxit, Laurent; Skvortsov, Alex; Kirby, Ray

doi:10.1016/j.oceaneng.2023.113899

Cited by 11 publications

(9 citation statements)

References 31 publications

(47 reference statements)

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“…Notably, the simple harmonic excitation is placed in the center of the parent plate with the whole structure being embedded in the infinite rigid baffle. According to the classical plate-shell theory [7][8][9] , the motion equation of the substrate plate is: ( ) ( )…”

Section: Vibration and Acoustic Radiation Model Of Acoustic Coatings ...mentioning

confidence: 99%

“…By virtue of collecting the vibration displacement of the sample surface as well as the underwater acoustic radiation pressure by a vibration sensor and hydrophone respectively, this method can determine the underwater vibroacoustic characteristics of the structure through further data processing. Overall, it is mainly divided into two categories, encompassing the small-sample acoustic tube test and the large-sample anechoic tank test [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

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Method for vibration and acoustic radiation analysis of underwater stiffened plates with acoustic coatings

Wang,

Li,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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Based on the effective medium theory as well as the three-dimensional viscoelastic theory, a semi-analytical model of the three-dimensional underwater vibration and acoustic radiation with cavity-type stiffened plate structures covered with acoustic coatings is established to solve the issues related to underwater vibration and acoustic radiation calculation of the stiffened plate and shell structure with complex acoustic coatings. By comparing the far-field acoustic radiation characteristics of the proposed semi-analytical model and the finite element numerical model, this research verifies the validity and accuracy of the proposed model. On such a basis, this research preliminarily investigates the coupling effect exerted by stiffeners and parent plates in stiffened plates as well as the vibroacoustic characteristics of acoustic coatings, thereby providing a valuable idea for the prediction of vibroacoustic characteristics concerning underwater structures.

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Section: Vibration and Acoustic Radiation Model Of Acoustic Coatings ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Method for vibration and acoustic radiation analysis of underwater stiffened plates with acoustic coatings

Wang,

Li,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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“…• for Z 1+2 , an analytical formulation is implemented with the image source method to account for the infinite reflections of acoustic waves off the waveguide boundaries [5]. • for Z 2 , an analytical formulation is implemented based on a decomposition of the acoustic pressure on the circumferential orders of the subsystem.…”

Section: Condensation Functions and Calculation Of The Condensed Tran...mentioning

confidence: 99%

“…Compared to free-field conditions where an infinite water domain is considered, a strong coupling arises from the interaction between the shell and the boundaries of the waveguide. An analytical formulation of this problem has been derived recently [5], which gives us a reference result. The objective of this study is to solve this problem using subtractive modelling via the CTF and rCTF methods, and compare the performances of this approach to the analytical resolution.…”

Section: Introductionmentioning

confidence: 99%

A subtractive modelling approach for predicting the radiation of a cylindrical shell in a waveguide

Dumortier,

Kha,

Maxit

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Numerical methods for predicting the underwater radiated noise of submerged structures are of paramount importance for ensuring high performance of systems for naval applications. When it comes to studying submerged structures in a shallow water environment, the influence of the sea surface and seabed cannot be neglected as strong coupling arises between the system and the environment boundaries. In this paper, the radiation from a cylindrical shell submerged in a perfect acoustic waveguide composed of an upper free surface and a rigid floor is investigated using a subtractive modelling approach based on the previously developed CTF (Condensed Transfer Function) and rCTF (reverse Condensed Transfer Function) methods. These methods enable prediction of the behavior of a system from the combination of the condensed transfer functions of the coupled and de-coupled subsystems which the original system is composed of. Following this principle, the radiation of the cylindrical shell in the waveguide can be investigated from the calculation of the condensed transfer functions of the waveguide, of the water volume occupied by the cylindrical shell, and of the uncoupled shell. Results from this approach are compared to a recently developed analytical procedure.

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“…This transformation essentially converts the acoustic radiation problem into an acoustic scattering problem. Kha [16] employed Flügge's shell theory to model the equations of motion for thin shells. Adopting the image source method to implement fluid-structure coupling and consider the infinite reflection of acoustic waves off the waveguide boundary, an analytical vibroacoustic model for an infinite cylindrical shell under line-distributed harmonic excitation is presented.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Scattering Characteristics and Geometric Parameter Prediction for Underwater Multiple Targets Arranged in a Linear Pattern

Zhang,

Yin,

Wang

et al. 2024

JMSE

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The construction of wind farm pilings, submarine pipelines, and underwater submarines involves multiple cylinders. However, there is currently a lack of economic research on predicting the mechanism and characteristics of mutual coupling of acoustic scattering from multiple cylindrical targets. This study investigates the mechanism and prediction method of acoustic scattering for the structural distribution characteristics of underwater multi-cylindrical targets. A model of a multi-cylindrical target’s two-dimensional acoustic field was established using the finite element method. Numerical calculations were then carried out to elucidate the scattering characteristics of the frequency–angle spectrum in far-field omnidirectional scattering. The simulation of echoes in the time domain explains how echoes propagate and interact with each other, and provides formulas for calculating interference and resonance frequencies. The frequency calculation formula extracts key features from the spectrum, providing a basis for predicting the characteristics of multi-cylindrical targets in terms of scale and spatial position. Measurement experiments were conducted on a double-cylindrical target in a water tank, and the theoretical calculations and experimental data were used to estimate the target’s radius and distance. The actual layout confirms the accuracy of the interference and resonance frequency prediction formulas. This study offers a valuable solution for refined feature extraction and spatial estimation of underwater targets.

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Forced vibroacoustic response of a cylindrical shell in an underwater acoustic waveguide

Cited by 11 publications

References 31 publications

Method for vibration and acoustic radiation analysis of underwater stiffened plates with acoustic coatings

Method for vibration and acoustic radiation analysis of underwater stiffened plates with acoustic coatings

A subtractive modelling approach for predicting the radiation of a cylindrical shell in a waveguide

Acoustic Scattering Characteristics and Geometric Parameter Prediction for Underwater Multiple Targets Arranged in a Linear Pattern

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