Applicationsof Electro-Rheological (ER)or Magneto-Rheological (MR) fluids as typical smart materials have been widely investigated over the past decades (since their
introduction in 40’s). The special applications of these materials as a means of noise suppression are not yet investigated. Constrained Layer Damping (CLD) sheets can be
realized by incorporating EMR (ER/MR) materials. In this way,a multilayered damping sheet is obtained with
adaptive (tunable) stiffness and damping characteristics. These
properties are easily changed in proportion to the electric (magnetic) field applied
upon the EMR layer.This notion has been introduced for semi-active
vibration control problems.Herein, such panels incorporating EMR material are proposed for adaptive acoustic treatments. Modeling (simulation) of a 3-layered panel with the middle layer being
EMR with adjustable
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Delivorias, R.P. (2004) Research on Smart Materials: Application of ER and MR Fluid in an Automotive Crash Energy Absorber.
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Tang, H. and Lee, S.Y. (2007) Direct Experimental Verification of the Sound-Induced Tunable Resonance on a Flexible Electrorheological Layer. Journal of Applied Physics, 101, 131-136. http://dx.doi.org/10.1063/1.2719277
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Tan, E.L. (2006) Hybrid Compliance-Stiffness Matrix Method for Stable Analysis of Elastic Wave Propagation in Multilayered Anisotropic Media. Journal of the Acoustical Society of America, 119, 45-53. http://dx.doi.org/10.1121/1.2139617
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Tan, E.L. (2007) Matrix Algorithms for Modeling Acoustic Waves in Piezoelectric Multilayers. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 54, 2016-2023. http://dx.doi.org/10.1109/TUFFC.2007.496
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Tan, E.L. (2011) Recursive Asymptotic Hybrid Matrix Method for Acoustic Waves in Multilayered Piezoelectric Media. Open Journal of Acoustics, 1, 27-33. http://dx.doi.org/10.4236/oja.2011.12004
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Beranek, L.L. and Work, G.A. (1949) Sound Transmission through Multiple Structures Containing Flexible Blankets. Journal of the Acoustical Society of America, 21, 419-428. http://dx.doi.org/10.1121/1.1906530
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London, A. (1949) Transmission of Reverberant Sound through Double Walls. Journal of the Acoustical Society of America, 22, 270-279.
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