Transmission of sound through sandwich panels: A reconsideration

Dym, Clive L.; Ventres, C. S.; Lang, Mark A.

doi:10.1121/1.380871

Cited by 43 publications

(30 citation statements)

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“…Similar conclusions can be drawn for (4,1) flexural mode, which is shown in Figure 8(d). Therefore, it can be stated that the STL of the sandwich panel is increased at (1,1) and (2,1) inphase modes due to modal restructuring, however, modal control plays a role at (3,1) and (4,1) inphase modes.…”

Section: Control Of Noise Transmission By Cancelling the Volume Velocmentioning

confidence: 99%

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Sahu

Tuhkuri

Reddy

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, active control of harmonic sound transmitted through a soft-core sandwich panel into a rectangular enclosure is studied. As it has already been shown for the low frequency region, the noise transmission through a soft-core sandwich panel mainly occurs due to the flexural and the dilatational modes. Therefore, in this study, volume velocity cancellation control strategy is used to control these modes, and achieve sound attenuation in a broad frequency range. Point force and uniformly distributed force actuators are used as the secondary actuator to cancel the volume velocity of the bottom faceplate, which opens to the cavity, of the sandwich panel. Cancelling the net volume velocity of the bottom faceplate is compared not only in terms of the reduction in sound transmission through the sandwich panel into cavity but also in terms of the faceplate velocities. Also, the effectiveness of the volume velocity cancellation strategy has been studied for different values of isotropic loss factor of the core. Sound transmission into the cavity has also been calculated by considering the effect of cavity pressure on the sandwich panel. Numerical studies indicate that the active control method controls both the flexural and the dilatational modes of the sandwich panel and therefore, attenuates significant amount of sound pressure inside the cavity irrespective of the isotropic loss factors of the viscoelastic core in a broad frequency range. Also a finite element study has been done in the commercially available COMSOL Multiphysics software to compare with the analytical results.

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Section: Control Of Noise Transmission By Cancelling the Volume Velocmentioning

confidence: 99%

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Sahu

Tuhkuri

Reddy

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…Here, we use the real-valued deformation law analogously to (25) and the strain-displacement relations using the form…”

Section: Forced Damped Displacement and Surface Velocity Fieldsmentioning

confidence: 99%

Analytical study of the structural-dynamics and sound radiation of anisotropic multilayered fibre-reinforced composites

Täger

Dannemann

Hufenbach

2015

Journal of Sound and Vibration

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“…On the other hand, while a reduced mass is an advantage for fixed structural resistance, it generally induces lower vibroacoustic performance. Therefore, the design of sandwich panels for reduced acoustic radiation, limiting the mass of the system, has received more and more attention in the last decades [1,2,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…One of the main reasons for a larger acoustic radiation of sandwich panels is the shear core effect in the mid-frequencies [1,2,3,4,5,6]; the transition from global bending to core shear is fundamental [7]. The effects of this wavemode transition has been investigated by describing panel using an equivalent shear core [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

Errico

Ichchou

Rosa

et al. 2020

Mechanical Systems and Signal Processing

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Two types of sandwich panels are designed by using the periodic structure theory. A double-wall panel with mechanical links and a sandwich panel with rectangular core are studied. An oriented optimization of the elastic bending waves' propagation versus the acoustic wavenumbers is achieved by using shifted core walls and by keeping the mass and stiffness of the system constant. Standard and optimized configurations are 3D-printed and sound transmission measurements are carried out by using a facility with an uncoupled reverberant-anechoic configuration. The experimental evidences of enlarged bending band-gaps and deformation mechanisms are proved using a reverse approach based on the acoustic radiation of the panels.

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Transmission of sound through sandwich panels: A reconsideration

Cited by 43 publications

References 0 publications

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Analytical study of the structural-dynamics and sound radiation of anisotropic multilayered fibre-reinforced composites

Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

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