This work presents an extensive analysis of the properties of distributed vibration absorbers (DVAs) and their effectiveness in controlling the sound radiation from the base structure. The DVA acts as a distributed mass absorber consisting of a thin metal sheet covering a layer of acoustic foam (porous media) that behaves like a distributed spring-mass-damper system. To assess the effectiveness of these DVAs in controlling the vibration of the base structures (plate) a detailed finite elements model has been developed for the DVA and base plate structure. The foam was modeled as a poroelastic media using 8 node hexahedral elements. The structural (plate) domain was modeled using 16 degree of freedom plate elements. Each of the finite element models have been validated by comparing the numerical results with the available analytical and experimental results. These component models were combined to model the DVA. Preliminary experiments conducted on the DVAs have shown an excellent agreement between the results obtained from the numerical model of the DVA and from the experiments. The component models and the DVA model were then combined into a larger FE model comprised of a base plate with the DVA treatment on its surface. The results from the simulation of this numerical model have shown that there has been a significant reduction in the vibration levels of the base plate due to DVA treatment on it. It has been shown from this work that the inclusion of the DVAs on the base plate reduces their vibration response and therefore the radiated noise. Moreover, the detailed development of the finite element model for the foam has provided us with the capability to analyze the physics behind the behavior of the distributed vibration absorbers (DVAs) and to develop more optimized designs for the same.

1.
Marcotte, Pierre, Fuller, C.R., Cambou, Pierre, 1999, “Control of noise radiated by a plate using a distributed active vibration absorber (DAVA),” ACTIVE99, Ft. Lauderadale, FI, pp. 447–456.
2.
Cambou, Pierre E., 1998. “A distributed Active Vibration Absorber (DAVA) for Active-Passive Vibration and Sound Radiation control,” Masters Thesis, Virginia Tech., VA.
3.
Osman, Haisam, Johnson, Marty, Fuller, Chris, Esteve, Simon, Marcotte, Pierre. 2002 “Application of damped helmholtz resonators and distributed vibration absorber for the control of noise transmission in to a cylinder” ICSV9, Orlando, Fl.pp. 1–8.
4.
Fahy, Frank. 1985, “Sound and Structural Vibration Radiation, Transmission and Response,” Academic Press, Inc. Orlando, Fl, pp. 143–197.
5.
Yang, T.Y., 1986, “Finite Element Structural Analysis,” Prentice Hall, Inc., finglewood Cliff, New Jersey, pp. 399–480.
6.
Allard, J.F., 1993, “Propagation of sound in porous media, modeling sound absorbing materials.” Elsevier Science Publishers LTD., London, pp. 118–143.
7.
Panneton
R.
, and
Atalla
N.
,
1997
, “
An efficient finite element scheme for solving the three dimensional poroelasticity problem in acoustics
,”
J. Acoust. Soc. Am.
, Vol.
101
(
6
), pp.
3287
3298
.
8.
Gardner, B., Burkewitz, B., Bremner, P., Fuller, C., Atalla, N., “Advanced Acoustic Blankets Concepts for Payload Fairings,” S/C&L/V, Dynamic Environment Workshop, June 25–27, 2002.
This content is only available via PDF.
You do not currently have access to this content.