| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating structure of a microphone and a wind tunnel testing apparatus with which hissing sound can be reduced and aerodynamic sound generated from an object of a test can highly accurately be measured. SOLUTION: A thin film part 7 is fixed on the almost same face as a wall face of a fixed wall part 3a by leaving an interval between the film part and a vibration face 5d. The thin film part 7 is formed by stacking and bonding a plurality of thin films 8 and 9. The thin films 8 and 9 are adhesive tapes made of synthetic resin, which consist of films made from polypropylene. An adhesive layer 9b of the thin film 9 is stuck to the wall face of the fixed wall part 3a. The vibration face 5d is covered with the thin film part 7. Thus, when air flows into a wind tunnel measuring part 3, the thin film part 7 suppresses the disturbance of flow of air near the vibration face 5d, and the thin film part 7 prevents air flowing in the wind tunnel measuring part 3 from directly striking the vibration face 5d. Consequently, noise such as hissing sound and wind noise and the like generated by air passing near the vibration faces 5d is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI
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