Acoustic scattering reduction using layers of elastic materials

Dutrion, Cécile; Simon, Frank

doi:10.1016/j.jsv.2016.10.034

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Condensation function, defined in section 2 φ Azimuthal angle, shown on figure 4 ψ m,n Spherical harmonics, defined in Eq. (25) ρ Density, defined in table 1 θ Polar angle, shown on figure 4 ω Angular frequency, appearing in section 4.4.1 Ω Surface junction between the subsystems, defined in figure 2 Ω i Surface of the patch, defined in section 4.2.2…”

Section: Z αmentioning

confidence: 99%

“…a default) in a multilayered cylinder is modeled. Analytical models of multilayered cylinders exist in the literature (see references [23][24][25][26][27]) but only numerical methods like FEM can be used to model a multilayered cylinder with a void cavity, leading to very considerable computation times. To tackle this issue, we aim at developing a subtractive method that could be used in this illustrative example to subtract from the analytical multilayered cylinder model a numerical model of the part of the multilayered cylinder corresponding to the geometry of the void cavity (see figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Vibroacoustic subtractive modeling using a reverse condensed transfer function approach

Dumortier

Maxit

Meyer

2021

Journal of Sound and Vibration

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Substructuring methods are a very common and efficient way to solve complex vibroacoustic problems. The Condensed Transfer Function (CTF) approach is a substructuring method based on the concept of subsystem condensed transfer functions (corresponding to admittances or impedances) that allows assembling acoustical or mechanical subsystems coupled along lines or surfaces. For certain practical applications, it may be more efficient to subtract or to decouple a subsystem to a global system rather than assembling different subsystems. In this paper, a reverse formulation of the CTF method is proposed. This formulation allows us to predict the behavior of a subsystem that is part of a larger system, from the knowledge of the condensed transfer functions (CTFs) of the global system and of the residual subsystem that must be removed. For purposes of validation, the scattering problem of a rigid sphere in an infinite water domain impacted by an acoustic plane wave is considered. Comparisons with theoretical calculations are used to validate the formulation proposed and permit studying its accuracy for two types of condensation functions defining the CTFs.

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Section: Z αmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibroacoustic subtractive modeling using a reverse condensed transfer function approach

Dumortier

Maxit

Meyer

2021

Journal of Sound and Vibration

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“…Dutrion and Simon examined the property of acoustic scattering with device, an infinite rigid cylinder with multilayer wrapping made of viscoelastic material placed in fluid. [8] Akbarov et al [9] and Li et al [10] studied the axisymmetric longitudinal fundamental wave propagation (dispersion) in the bi-layered circular cylinder made of linear viscoelastic materials and extended the classical wave propagation theory in elastic cylinders. Talebitooti et al determined the sound transmission loss of an infinitely long composite cylinder, and inspected the effects of various material cores on the sound insulation property of the doubly curved shells.…”

Section: Introductionmentioning

confidence: 99%

Effect of porous surface layer on wave propagation in elastic cylinder immersed in fluid

Su¹,

Han²,

Shan³

et al. 2023

Chinese Phys. B

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To study the damage of an elastic cylinder immersed in fluid, a model of an elastic cylinder wrapped with a porous medium immersed in fluid is designed. This structure can both identify the properties of guided waves in a more practical model and address the relationship between the cylinder damage degree and the surface and surrounding medium. The principal motivation is to perform a detailed quantitative analysis of the longitudinal and flexural modes in an elastic cylinder wrapped with a porous medium immersed in fluid. The frequency equations for the propagation of waves are derived, each for a pervious and an impervious surface employing Biot theory. The influences of the various parameters of the porous medium wrapping layer on the phase velocity and attenuation are discussed. The results show that the influence of porosity on the dispersion curves of guided waves is much more significant than that of thickness, whereas the phase velocity is independent of the static permeability. There is an apparent “mode switching” between the two low-order modes. The characteristics of attenuation are in good agreement with the dispersion curves results. This work can support future studies for optimizing the theory of cylinder or pipeline damage detection.

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“…Underwater acoustic scattering is also an important issue, such as underwater acoustic scattering signal separation [9], acoustic scattering from underwater elastic objects [10], acoustic scattering by suspended flocculating sediments [11] and acoustic scattering in gassy soft marine sediments [12]. Other problems such as acoustic scattering-resonance [13], acoustic scattering reductions [14], acoustic scattering in nonuniform potential flows [15], designing the bilaminate acoustic cloak [16], control of acoustic absorptions [17], acoustic interaction forces [18] , acoustic radiation forces [19], and scattering effects on an acoustic black hole [20] are also considered.…”

Section: Introductionmentioning

confidence: 99%

Acoustic scattering theory without large-distance asymptotics

Zhou

Dai

2018

J. Phys. Commun.

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In conventional acoustic scattering theory, a large-distance asymptotic approximation is employed. In this approximation, a far-field pattern, an asymptotic approximation of the exact result, is used to describe a scattering process. The information of the distance between the target and the observer, however, is lost in the large-distance asymptotic approximation. In this paper, we provide a rigorous theory of acoustic scattering without the large-distance asymptotic approximation. The acoustic scattering treatmentdeveloped in this paper provides an improved description for the acoustic wave outside the target. Moreover, as examples, we consider acoustic scattering on a rigid sphere and on a nonrigid sphere. We also illustrate the influence of the near target effect on the angular distribution of outgoing waves. It is shown that for long wavelength acoustic scattering, the near target effect must be reckoned in.

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Acoustic scattering reduction using layers of elastic materials

Cited by 10 publications

References 22 publications

Vibroacoustic subtractive modeling using a reverse condensed transfer function approach

Vibroacoustic subtractive modeling using a reverse condensed transfer function approach

Effect of porous surface layer on wave propagation in elastic cylinder immersed in fluid

Acoustic scattering theory without large-distance asymptotics

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