| 摘要 |
PROBLEM TO BE SOLVED: To secure the rigidity of a sound absorption structure by restricting reduction in the strength of an outer layer while improving a sound absorption coefficient at a low pitched sound zone. SOLUTION: A sound absorption structure 1 comprises a clearance layer 10 having a clearance and an outer layer 11 covering the clearance layer 10. The outer layer 11 has holes 13 communicating with the clearance of the clearance layer 10. Cylindrical members 3 formed to be longer than the thickness size of the outer layer 11 are fitted into the holes 13. The cylindrical member 3 has an outer side contact part 14 extending along the surface of the outer layer 11. An inner hole 3a of the cylindrical member 3 communicates with the clearance in the clearance layer 10. COPYRIGHT: (C)2009,JPO&INPIT
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