Noise Reduction of Rectangular Cavity with Sandwich Polycarbonate Window Pane for Automobile

Min Shen; Kazuteru Nagamura
November 2013
Journal of Applied Sciences;2013, Vol. 13 Issue 22, p5050
Academic Journal
In the automobile industry, the use of Polycarbonate (PC) window pane is well developed. However, the sound insulation performance of automobile = s Polycarbonate composite pane is poor than traditional glass pane because of its high rate of stiffness to low weight. There is need to design polycarbonate window pane with superior acoustical insulating property for automobile consumer comfort. In this study, the innovative super thin sandwich structure(less than 10 mm) was developed using viscoelastic core layers and the outer layer of the panel was fabricated from Polycarbonate composite panel. This paper introduces the vibro-acoustic models to predict the response of the pane and to evaluate the effect of damping treatment on both structural vibration and noise transmission in the fluid domain. One of the particularities of the proposed model lies in the only storage of the panel impedance matrix reducing the numerical efforts of previous studies. The numerical results reveals that noise attenuation can be realized by appropriate selection of structural parameters such as the damping of structural and cavity, the thickness of the pane and density of viscoelastic core material.


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