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A correction method of tube attenuation in impedance-tube two-microphone-position method for absorption coefficient
http://hdl.handle.net/10487/7918
http://hdl.handle.net/10487/7918467ae300-18ff-472c-bd1e-c3a24e37b713
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21 inter･noise200612.pdf (769.8 kB)
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| Item type | 会議発表論文 / Conference Paper(1) | |||||||||||||||||||||
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| 公開日 | 2010-12-14 | |||||||||||||||||||||
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| タイトル | A correction method of tube attenuation in impedance-tube two-microphone-position method for absorption coefficient | |||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||
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| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||||||||||||||||||
| 資源タイプ | conference paper | |||||||||||||||||||||
| 著者 |
寺尾, 道仁
× 寺尾, 道仁
× Terao, Michihito
× 石井, 孝憲
× Ishii, Takanori
× 関根, 秀久
× Sekine, Hidehisa
× 服部, 康章
× Hattori, Yasufumi
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| 内容記述タイプ | Abstract | |||||||||||||||||||||
| 内容記述 | A correction method for the tube attenuation is given in ISO 10534 (Determination of sound absorption coefficient and impedance in impedance tubes). However, it can be noticed in experiments that this method yields a systematic error in the absorption coefficient. The error is as a sinusoidal function of frequency, whose magnitude is a few percent of the absorption coefficient and whose frequency period corresponds to the wave length of two times the distance between the test piece surface and the microphone location for the reflection factor measurement. Investigation of the cause for this phenomenon was carried out based on the Kirchhoff acoustic dissipation theory of the viscous and thermal boundary layer for wide tubes. Consequently it was found that the ISO correction method regards only the irreversible component and disregards the reversible component of the tube attenuation. A determination technique of the attenuation constant as a function of position is developed and implemented. The effectiveness of the position-dependent attenuation-constant in the twomicrophone- position reflection-factor determination and in the tube-attenuation correction was evaluated by conducting BEM numerical simulations and experimental tests. |
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| 内容記述タイプ | Other | |||||||||||||||||||||
| 内容記述 | 会議名称:The 35th International Congress and Exposition on Noise Control Engineering | |||||||||||||||||||||
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| 内容記述タイプ | Other | |||||||||||||||||||||
| 内容記述 | 主催学会:INCE/USA & INCE-Japan | |||||||||||||||||||||
| 書誌情報 |
INTER-NOISE 2006: DECEMBER 3-6 2006, HONOLULU, HAWAII, USA 発行日 2006 |
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| 出版タイプ | VoR | |||||||||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||||||
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| 出版者 | INCE/USA & INCE-Japan | |||||||||||||||||||||
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| 内容記述タイプ | Other | |||||||||||||||||||||
| 内容記述 | Article | |||||||||||||||||||||
