Vibro-acoustic analysis of a rectangular-like cavity with a tilted wall

Li, Y. Y.; Li, Cheng

doi:10.1016/j.apacoust.2006.04.005

Cited by 53 publications

(35 citation statements)

References 18 publications

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“…So far, to our knowledge, no theoretical attempt has been carried out to interpret the efficiency, in terms of absorption of energy in a liquid-filled tank. On the other hand, in the domain of air-filled cavities, authors show the effects of irregular shapes (tilted wall) on the eigenmodes (and their coupling) and their usefulness for such perturbed fields [13,23]. These two techniques are likely to be the subject of investigations (among others) in the near future.…”

Section: Resultsmentioning

confidence: 99%

Small-Sized Rectangular Liquid-Filled Acoustical Tank Excitation: A Modal Approach Including Leakage Through the Walls

Novák¹,

Bruneau²,

Lotton³

2018

Acta Acustica united with Acustica

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Small-sized water-filled tanks with thin (compared to the acoustic wavelength) walls that are surrounded on all sides by air, have been used over the past decades for underwater studies. So far, the analytical modelling of the acoustic field inside such an enclosure considers either the eigenvalue problem with pressure release conditions at the walls or imposes empirical impedance boundary conditions, or even proceeds in analogy with the field within a waveguide. At low frequencies, approximations involving an incompressible fluid or the Laplace equation have been used. Those models have limitations that are always caused by simplification of the boundary conditions. This paper deals with both an analytical formulation expressing the acoustic leakage through the walls (lossy and reacting walls) and modal solutions for the acoustic pressure and acoustic velocity fields when a source emits energy and when it is shut off, providing the transient acoustic response of small tanks quantitatively. Several analytical results are compared with experimental observations. The archived file is not the final published version of the article A.

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Section: Resultsmentioning

confidence: 99%

Small-Sized Rectangular Liquid-Filled Acoustical Tank Excitation: A Modal Approach Including Leakage Through the Walls

Novák¹,

Bruneau²,

Lotton³

2018

Acta Acustica united with Acustica

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“…For the rectangular cavity, the coupling coefficient between cavity sound field and flexible wall was analyzed. 1 As for the irregular cavity, Li and Cheng 13,15 studied the coupling coefficients between modes of trapezoidal cavity and simply supported flexible wall. But for the case of clamped flexible wall, the coupling coefficient is still unknown.…”

Section: Modal Coupling Coefficientmentioning

confidence: 99%

“…14 For the irregular cavity with a simply supported flexible wall, the coupling coefficient was used to reflect the coupling extent between irregular cavity and its flexible wall, and the effect of elevation angle on the coupling coefficient and forced response was analyzed. 13,15 The flexible wall on the cavity considered above was supposed simply supported along its edges. In addition to classical modal coupling method, a weak form variational-based method was used to construct the coupling model between cavity sound field and its flexible wall.…”

Section: Introductionmentioning

confidence: 99%

Vibro-acoustic analysis of a trapezoidal cavity with a clamped flexible wall

Yuan

Zhang

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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The coupled model between trapezoidal cavity and its clamped flexible wall is developed using classical modal coupling theory. Based on the coupled model, the resonance frequencies of coupled system are obtained and compared with the corresponding uncoupled one. Meanwhile, the reason for the variation of resonance frequencies of coupled system modes is analyzed in detail. Then, the response of coupled system is investigated using the acoustic potential energy in the cavity and panel vibration kinetic energy when it is excited by an incident plane wave outside of the cavity. Coupling coefficient between trapezoidal cavity and its clamped flexible wall is proposed to assess the modal matching degree between them. It is shown that the coupling selection is not satisfied except in the axis direction which is parallel to the inclined wall. In addition, a rectangular cavity with a clamped flexible wall is also considered and compared with that of the trapezoidal one.

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“…Moreover, the interaction between the plate and the air cavity, and the vibro-acoustic analysis of the coupled system have been further investigated (Lee, 2002;Citarella et al, 2007;Seifzadeh et al, 2014). The early research aimed at progressively improving the theoretical knowledge of and the physical insight into the vibro -acoustic coupling problems (Li and Cheng, 2006;Du et al, 2011Du et al, , 2012Tanaka et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Prediction of the effect of porous sound-absorbing material inside a coupled plate cavity system

Liu

Fard

Davy

2016

IJVNV

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This paper predicts the acoustic properties of the porous sound absorbing material in a box cavity by conducting a FEM (Finite Element M ethod) analysis, and it verifies the estimated acoustic properties using an appropriate experimental method. The cavity is a rectangular box with five rigid walls and one flexible wall which is an aluminium plate. The porous sound absorbing material is attached to the inner surface of the plate, in order to modify the coupling between the plate inner surface and the air inside the box. The plate is mechanically excited by using an electromagnetic shaker, which is imitating structure-borne noise. The generated noise is recorded by using pressure microphones at the different locations inside the box. The results show that there is good agreement between the FEM prediction and the measurement for the acoustic response at different locations inside the rectangular box. Sound pressure peaks due to cavity modes are effectively reduced by adding porous sound absorbing material. Furthermore, sound level in the cavity is reduced by a similar amount in both the numerical simulation and the measurement, when a porous sound absorbing material is added. The developed FEM model is used to characterize the effects of porous sound absorbing material in reducing the structure-borne radiated noise.

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Vibro-acoustic analysis of a rectangular-like cavity with a tilted wall

Cited by 53 publications

References 18 publications

Small-Sized Rectangular Liquid-Filled Acoustical Tank Excitation: A Modal Approach Including Leakage Through the Walls

Small-Sized Rectangular Liquid-Filled Acoustical Tank Excitation: A Modal Approach Including Leakage Through the Walls

Vibro-acoustic analysis of a trapezoidal cavity with a clamped flexible wall

Prediction of the effect of porous sound-absorbing material inside a coupled plate cavity system

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