An analytical model, is developed to compute the laminate extension, coupling and bending stiffness on the base of the lamination plate theory. A finite element technique is utilized to formulate the stiffness, and mass matrices of the sandwich plate element, using the equivalent stiffness and mass method, take into account, lamina orientation, number of composite layer, volume fraction, core rubber layer, and boundary conditions on the dynamic characteristics of sandwich composite plates.

The experimental tests are carried out by using frequency response function displayed on fast fourier transformation (FFT) analyzer to measure the natural frequencies and mode shape. The damping capacity of sandwich plates are measured applying a half power band width method.

The experimental and numerical work is carried out on five different fiber orientation, namely; longitudinally, transversely, making 45°ree;, 30°ree; and 60°ree; with the fibers direction. Comparison between experimental and numerical results shows great ability vibration and attenuate structure born noise and good agreement. Also the vibration can be controlled by proper select lamina orientation and the viscoelastic core damping material.

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