| 摘要 |
PROBLEM TO BE SOLVED: To provide a wall member which can be made lightweight by being reduced in capacity by optimizing the thickness of a structure member according to the acoustic mode of object sound to be reduced. SOLUTION: The wall member is equipped with a sound absorbing wall 20 and a sound blocking wall 30 which are arranged one over the other; and the sound absorbing wall 20 has a thin part 21 and a thick part 22 and the sound blocking wall 30 has a thin part 31 and a thick part 32 so that the thick part 22 is arranged corresponding to a part where a particle speed is higher than a speed reference value and the thick part 32 is arranged corresponding to a a part where a sound pressure level is larger than a reference sound pressure value according to the acoustic mode of the object sound to be reduced. COPYRIGHT: (C)2004,JPO&NCIPI
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