Acive structural acoustic control of sound transmission through a soft-core sandwich panel

2015 ◽  
Vol 63 (5) ◽  
pp. 396-401 ◽  
Author(s):  
Kiran Chandra Sahu ◽  
Jukka Tuhkuri
Keyword(s):  
Sandwich Panel ◽  
Sound Transmission ◽  
Soft Core ◽  
Acoustic Control ◽  
Structural Acoustic Control

Active structural acoustic control of broadband sound transmission through a panel

1996 ◽  
Author(s):  
D. Peterson ◽  
G. Toth ◽  
B. Tran ◽  
G. Mathur ◽  
M. Simpson
Keyword(s):  
Sound Transmission ◽  
Acoustic Control ◽  
Broadband Sound ◽  
Structural Acoustic Control

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

2015 ◽  
Vol 229 (17) ◽  
pp. 3096-3112 ◽  
Author(s):  
Kiran Chandra Sahu ◽  
Jukka Tuhkuri ◽  
JN Reddy
Keyword(s):  
Active Control ◽  
Sandwich Panel ◽  
Control Method ◽  
Low Frequency ◽  
Sound Transmission ◽  
Soft Core ◽  
Frequency Range ◽  
Broad Frequency Range ◽  
Volume Velocity ◽  
Numerical Studies

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.

Active piezoelectric-structure acoustic control of a soft-core sandwich panel using volume velocity and a weighted sum of spatial gradient control metric

2015 ◽  
Vol 23 (15) ◽  
pp. 2391-2400 ◽  
Author(s):  
Kiran Chandra Sahu ◽  
Jukka Tuhkuri ◽  
JN Reddy
Keyword(s):  
Sandwich Panel ◽  
Power Level ◽  
Core Loss ◽  
Low Frequency ◽  
Sound Transmission ◽  
Soft Core ◽  
Spatial Gradient ◽  
Sound Power ◽  
Weighted Sum ◽  
Volume Velocity

In this paper, the active control of sound transmission through a simply supported soft-core sandwich panel is analytically studied. Since, the sound transmission through soft-core sandwich panels in the low-frequency region mainly occurs due to flexural and dilatational modes, and therefore to control these structural modes, volume velocity and weighted sum of spatial gradients (WSSG) are used to drive a piezoceramic actuator (PZT) attached on the exterior side of the bottom face plate. Sound power level and voltage required to drive the PZT are compared for different values of isotropic core loss factor. Numerical studies indicate that both control metrics are capable of attenuating the flexural and the dilatational modes of the sandwich panel, and hence, reduce significant amount of sound power in a wider frequency range. By carefully selecting the modes to calculate the scaling factors, WSSG provides comparable control to volume velocity. However, the necessary voltage required to drive the PZT to minimize the WSSG is less as compared to minimize the volume velocity.

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