Sound Radiation from an Elastically Restrained Plate Covered by an Acoustic Decoupling Layer

Wang, Gang; Li, Wanyou; Li, Wen Long; Du, Jingtao

doi:10.1155/2015/659472

Cited by 5 publications

(4 citation statements)

References 32 publications

(52 reference statements)

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“…represents the natural angular frequencies of the base plate and damping layer composite. Substituting (15), (22), (23), and (24) into (12) results in the following equations:…”

Section: Dynamics Of the System As Shown Inmentioning

confidence: 99%

“…In this paper, three vibroacoustic indicators are introduced: the mean squared velocity of the base plate (V 2 1 ), the mean squared velocity of the outer surface of the decoupling layer (V 2 2 ), and the radiated sound power by the system in water ( ). The definitions of the vibroacoustic indicators have been previously published [14,15,17].…”

Section: Dynamics Of the System As Shown Inmentioning

confidence: 99%

“…The first of model is based on the theory of wave propagation in a layered media [9] and is derived using an impedance transfer matrix [10][11][12], which just regards the tensile stresses and longitudinal waves in the decoupling material. The second type is the locally reacting model [13][14][15][16], which assumes that the decoupling material behaves as a set of evenly distributed massless springs on the plate. Such models however remain limited by their inherent inability to capture the complex propagation of elastic waves in the decoupling material [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and Theoretical Analysis for a Fluid-Loaded, Simply Supported Plate Covered by a Damping and Decoupling Composite Acoustic Coating

Yuan

Meng

Liu

et al. 2017

Shock and Vibration

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This work presents a vibroacoustic response model for a fluid-loaded, simply supported rectangular plate covered by a composite acoustic coating consisting of damping and decoupling layers. The model treated the damping layer and base plate as a unified whole under pure bending moments and the decoupling layer as a three-dimensional, isotropic, linear elastic solid. The validity of the model was verified by both numerical analysis and experiments and was shown to accurately extend previous studies that were limited to a plate covered by a single damping or decoupling layer with an evaluation confined solely to numerical analysis. The trends of the numerical and experimental results are generally consistent, with some differences due to the influences of water pressure and the frequency dependence of the material parameters, which are not taken into account by the numerical analysis. Both experimental and numerical results consistently show that the radiated noise reduction effect of the composite coating is superior to that of single-type coatings, which is attributed to the fact that the composite coating combines the merits of both the high vibration suppression performance of the damping layer and the superior vibration isolation performance of the decoupling layer.

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“…represents the natural angular frequencies of the base plate and damping layer composite. Substituting (15), (22), (23), and (24) into (12) results in the following equations:…”

Section: Dynamics Of the System As Shown Inmentioning

confidence: 99%

Section: Dynamics Of the System As Shown Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Theoretical Analysis for a Fluid-Loaded, Simply Supported Plate Covered by a Damping and Decoupling Composite Acoustic Coating

Yuan

Meng

Liu

et al. 2017

Shock and Vibration

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show abstract

“…The statements of the elasticity problem about the wave propagation in an elastic cylindrical waveguide under different radiation conditions at infinity are considered by Nazarov [14]. The sound radiation from elastically restrained plates covered by a decoupling layer is studied using the Spectrogeometric Method by Wang et al [15]. Present researches are focusing on the time average of the instantaneous energy flux.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Scattering Energy Properties of an Elastic Spherical Shell in Sandy Sediment Using an Improved Energy Method

Wang

Zhu

Sun

et al. 2017

Mathematical Problems in Engineering

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An elastic wave is composed of compressional (longitudinal) waves and shear (transverse) waves which have different wave velocities in solids. The acoustic field presents complex interference patterns which means its phenomena and properties are difficult to reveal. Fortunately, the energy method is more accurate than the potential function approach in describing the physical properties of the acoustic field. However, the polarization state of particle vibration excited by an elastic wave is spatially periodic in the wave propagation direction. Therefore, the energy propagation direction is not consistent with the wave propagation direction using commonly used energy method. According to the polarization state of particle vibration, a time-space averaging method based on the spatial periodicity of energy flux in the solid is proposed. The method could eliminate the influence of the interference due to local energy exchange and retain the trend of energy propagation. Several conclusions are illustrated through the analysis of the scattering energy properties of a steel shell in sandy sediment. Sandy sediment can not be regarded as a fluid nor a general solid. Scattering energy excited by an incident shear wave mainly concentrates in the vicinity of the directions of backscattering and forward scattering. Especially, at low frequency, it plays an important role in the total scattering energy excited by an incident compressional and shear wave.

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Simulation of the Acoustic Fields and Directivities Radiated from a Set of Elementary Sources

Tounsi¹,

Bedoui²,

Taktak³

et al. 2021

Applied Condition Monitoring

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Sound Radiation from an Elastically Restrained Plate Covered by an Acoustic Decoupling Layer

Cited by 5 publications

References 32 publications

Experimental and Theoretical Analysis for a Fluid-Loaded, Simply Supported Plate Covered by a Damping and Decoupling Composite Acoustic Coating

Experimental and Theoretical Analysis for a Fluid-Loaded, Simply Supported Plate Covered by a Damping and Decoupling Composite Acoustic Coating

A Study on the Scattering Energy Properties of an Elastic Spherical Shell in Sandy Sediment Using an Improved Energy Method

Simulation of the Acoustic Fields and Directivities Radiated from a Set of Elementary Sources

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