This work investigates measurement of vibration-damping properties, finite element modelling and calculation of sound power of laminated stuctures. The viscoelastic material properties of laminated structure are obtained through modal testing of a sample material. Using those properties, the vibrational reduction of the laminated structure is estimated by finite element analysis. The surface velocity of the structure is also obtained from finite element analysis, and then the sound power is estimated by solving the Helmholtz integral equation.
In order to investigate the noise and vibration reduction capability of the laminated oilpan, the vibration and sound power characteristics of the laminated and steel oilpans are compared using the proposed method. It suggests that the method is capable of predicting the noise and vibration reduction of laminated structures in design stage with fair accuracy.
