Patent ID: 7654364
Filing Date: 2010-02-02
Classification: B32B,B60R,G10K

Abstract:
1. A sound absorbing structure for suppressing noise generated on a sound source side, said sound absorbing structure comprising: A perforated panel having a large number of through holes and a fiber material, which are oppositely provided on said sound source side and provided so as to be stacked on each other; and An air layer provided behind said perforated panel or said fiber material, wherein said fiber material satisfies Equation 1 below and said perforated panel satisfies Equation 2 below: Where x=( 4/3×log p: density of fiber material (kg/m t: thickness of fiber material (mm) d: hole diameter of through holes of perforated panel (mm) β: aperture ratio of through holes of perforated panel (%).