To provide a method for improving a sound absorbing coefficient in a sound range of 500Hz to 1kHz without increasing thickness and air layer of a porous material, and to provide a compound sound absorbing structure body for practical use.
The compound sound absorbing structure body is obtained by holding a film-like or a thin plate-like material C between a mesh structure body A transmitting acoustic waves and a mesh structure body B to obtain a double layer structure body by partly fixing D them to each other, and further, closely compounding the mesh structure body B of a compound structure body and the porous sound absorbing material E. Thus, it the compound sound absorbing structure body which can be increased in a sound absorbing coefficient in a not only middle and high sound range but also low sound range without increasing the thickness of the sound absorbing structure body can be obtained.
SHIMIZU KIYOSHI
IKEDA KOJI
IIDA KAZUYOSHI
| JPH03147838A | 1991-06-24 | |||
| JPH08198660A | 1996-08-06 | |||
| JP2000250561A | 2000-09-14 | |||
| JPH0683365A | 1994-03-25 | |||
| JPH0657912U | 1994-08-12 |