| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorption structure with a perforated plate arranged therein which is light in weight, highly strong, strong to impact as well, and excellent in sound absorption performance as well. SOLUTION: The sound absorption structure attached to at least one of a front surface, the flank and under surface of a vehicle is provided with a sound insulating member through a porous material and/or air layer behind the following sound absorption material: A sound absorption material formed by disposing the porous material 2 having a number of fine pores communicating the front and rear on the back of the perforated plate 1 consisting of a metallic sheet of aluminum, etc., having an opening rate of≤35%, for example, the porous material formed by compression bonding an assemblage of metallic fibers of aluminum, an aluminum alloy, a stainless steel, etc., by a method, such as rolling or the porous material formed by additionally installing net materials, such as expanded metals, to both surfaces or one surface of the assemblage of the metallic fibers and subjecting the same to compression bonding and molding. COPYRIGHT: (C)2004,JPO
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