SOUND ABSORBING STRUCTURE HAVING HONEYCOMB MATERIAL LAYER MADE OF COMPOSITE STRUCTURE LAYER OF AIR LAYER AND FOAM LAYER

摘要

PROBLEM TO BE SOLVED: To provide a sound absorbing structure which uses a composite honeycomb sound absorbing layer and is suitable for sound absorption of wide-range.;SOLUTION: The sound absorbing structure is constituted of three layers, namely, a porous sound absorbing surface material 1, a sound absorbing layer, and a sound insulating reflective material 5, and an aluminum porous plate which is light-weight and is suitable for a panel constitution is selected as the sound absorbing surface material, and an aluminum plate is selected as the reflective plate being the sound insulating layer. A honeycomb material 2 which is to be a skeleton of panel strength and has a structure of an air layer 4 and is light-weight and has a strength is selected as the sound absorbing layer being a main component, and uniform high sound absorbing characteristics are obtained from a low frequency to a high frequency when the air layer is formed in the middle of a cell, and sound absorption performance of this panel structure requires only 50mm thickness which is 1/10 thickness of a conventional structure.;COPYRIGHT: (C)2004,JPO