Noritoshi Nakagawa

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Polycarbonate (PC) material is gradually substituted for the glass material as window pane in automobile. However, noise insulation performance of PC pane is poor than glass pane because of its high rate of stiffness to low weight. The purpose of this paper is to improve insulation performance of PC pane adopting sandwich structure. In this paper, a new(More)
Absorption performance of automobile window pane is poor by traditional methods using laminated plate with resin membrane between two folders of pane because of the low acoustic impedance of membrane resonator restricted by pane area. A compact and efficient sound absorbing structure without porous material is designed as a combination of baffle-resonators(More)
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