For many years vibration damping has been an important criterion in the design phase of many engineering applications. Large dissipation capabilities over a wide frequency range are desired. A common solution is to use a constrained visco-elastic material bonded to the vibrating structure. The damping material is applied in a sandwiched configuration. The shear deformation occurring in the visco-elastic core is mainly responsible for the dissipation of energy. Sandwich structures with embedded visco-elastic materials are widely used in aerospace, aeronautical, automobile industries due to their benefic performance in attenuating structural vibrations. Passive Constraining layer damping (PCLD) treatments are presently being implemented in many commercial and defense designs. In a passive constraining layer damping treatment, a visco-elastic layer is added to a conventional base beam. An analytical model which quantifies the bending and shearing contributions has been developed. The equations of motion were derived and solved in order to simulate the frequency responses of beam treated with PCLD. A experimental analysis was conducted in order to test this analytical model. The experimentally measured results were compared with the analytical results developed through MATLAB. The comparison shows that the analytical and experimental results accurately match the frequency response of the beam treated with passive constraining layer damping (PCLD).

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Tue, 19/04/2011 - 21:12