Sound transmission through a double panel structure periodically coupled with vibration insulators

Legault, Julien; Atalla, Noureddine

doi:10.1016/j.jsv.2010.02.013

Cited by 66 publications

(40 citation statements)

References 23 publications

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“…All the results of these studies showed that the external flow increases the sound transmission loss of the system. While cylindrical geometry represents a structure such as the fuselage more realistically than a flat plate, flat plate models have been frequently studied in the past [1,4,5,7,[10][11][12][13]. The primary motivation for this simplification is to be able to understand and bring out the essentials of the physics of the problem.…”

mentioning

confidence: 99%

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Sound transmission through a double-panel construction lined with poroelastic material in the presence of mean flow

Zhou

Bhaskar

Zhang

2013

Journal of Sound and Vibration

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mentioning

confidence: 99%

“…In the spirit of work carried out by Koval [10], Xin et al [11] and the works of other researchers [1,4,5,7], the focus of this paper is on flat plate geometries. Following this, we bring in realism to the model by considering the effect of curvature which is introduced via a shallow shell approximation.…”

mentioning

confidence: 99%

Sound transmission through a double-panel construction lined with poroelastic material in the presence of mean flow

Zhou

Bhaskar

Zhang

2013

Journal of Sound and Vibration

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“…The flexural displacement of a plate having an arbitrary shape can also be represented using an infinite series as in equation (5). Limiting the plate to a rectangular shape, its mode shapes can be represented by combination of shape functions in the two perpendicular directions.…”

Section: A Modal Description For Flexural Beam and Plate Vibrationmentioning

confidence: 99%

“…The phyiscal concept of the line impedance is similar to that used in the present paper. Legault and Atalla [5] used a wave-based model to investigate sound transmission through double panel structures with periodically spaced resilient mounts. A four pole formulation was employed for modelling the mount.…”

Section: Introductionmentioning

confidence: 99%

Energy transfer in a beam-framed structure using a modal method and a wave method at mid frequencies

Yoo

Thompson

Ferguson

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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A fully framed system consisting of four beams and a rectangular plate has been investigated in terms of the energy transfer between the beams and the plate when a force is applied to one of the beams. This configuration, which is a mixture of stiff and flexible elements, is a particularly important example in the industrial area, as it is widely used. A modal model based on interface basis functions is used. A wave model, which is an approximate method, has also been developed in which the plate, acting as a wave impedance, is separately attached to each beam. Experimental studies have been carried out for validation. The investigation with respect to power flow and energy shows the validity of both models in the mid-frequency region. The results show that most energy is dissipated by the flexible plate. The physical phenomena and limitations of the wave method for this particular structural configuration are discussed. Even though it is an approximate method, the wave approach can describe the dynamic characteristics of the excited beam and the plate in terms of the ratios of power and energy of each component. The comparison of the two methods shows that the plate rather than the beams plays a crucial role in transferring the energy from the excited beam to the parallel opposite beam in the beam-framed structure when these two beams have identical properties, whereas the energy transfer is reduced when the beams have dissimilar properties.

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“…To increase the TL of a sandwich panel, multilayer absorbers were inserted between the double panels (Chen et al 2000;Chen 2001, 2003;Mu et al 2011). The shape effects of the periodically repeated cell on the acoustic attenuation performance have been investigated by many researchers (Kobayashi et al 2004;Lee et al 2010;Legault and Atalla 2010). In addition, the effects of holes in a perforated panel and the internal cavity on transmission characteristics were investigated (Chen 1996;Sakagami et al 2010;Toyoda et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

Yoon

Lee

2016

Struct Multidisc Optim

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In this study, we optimally design the core of a metal sandwich panel used in high-speed railway vehicles to minimize the amount of metal solid in the core and subsequently reduce its weight. The optimum core must satisfy constraints regarding sound transmission class (STC) and compliance. Because the solid-void layout in the core strongly affects the acoustic and static characteristics of sandwich panels, the core layout should be carefully designed when reducing the amount of metal solid. To this end, three topology-optimization problems and one size-optimization problem are formulated and sequentially solved. A single unit cell is periodically repeated in the core. Thus, structural and acoustic topology-optimization problems are first formulated and solved for the unit cell. Based on the optimal topologies obtained for the unit cell, a moderate initial solid-void layout in the unit cell is determined for the size-optimization problem to optimally design core. The effectiveness of the current design approach for the core of the sandwich panel is validated by comparing the STC and compliance values of the optimal core design and a reference design. Nomenclature A N n¼1 finite element assembly operator Bmatrix relating the element strain vector to its nodal displacement vector C m e a nc o m p l i a n c e C ini initial mean compliance c speed of sound in air D constitutive matrix d 1 thickness of thin flat plates at both ends in a sandwich panel d 2 thickness of the bar inside a sandwich panel dis (r,m) distance between the centers of the r th and m th elements E r (χ r ) Young's modulus of the r th element

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Sound transmission through a double panel structure periodically coupled with vibration insulators

Cited by 66 publications

References 23 publications

Sound transmission through a double-panel construction lined with poroelastic material in the presence of mean flow

Sound transmission through a double-panel construction lined with poroelastic material in the presence of mean flow

Energy transfer in a beam-framed structure using a modal method and a wave method at mid frequencies

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

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