| Project/Area Number |
14580554
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
SHIBAYAMA Hideo Shibaura Institute of Technology, Professor, 工学部, 教授 (50052866)
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| Co-Investigator(Kenkyū-buntansha) |
福田 顕彰 芝浦工業大学, 工学部, 講師 (50052808)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | near field / linear microphone array / phase between the microphones / MUSIC and ESPRIT method / sound attenuation by distance / protection of environmental sound / estimation of location of noise source / direction of arrival sound wave / 近距離音場 / 距離減衰量 / 音波到来方向推定 / 回折波 / MUSIC法 / 超低周波音 / 音源位置探査 / 長距離伝播 / 音響インテンシティ / 空間平均法 / 固有値展開 / 遺伝的アルゴリズム / 相関波 / アレーマイクロホン |
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| Research Abstract |
We made an linear array microphone that is constructed by eight electret condenser microphones. Emitted sinusoidal wave signal with frequency of 80Hz from a loudspeaker, we estimated arrival direction of the acoustic waves by the MUSIC method. As estimated results, we were able to estimate the arrival direction with precision within 5 degrees. In the measurements, precision come under the influence of the signal to noise ratio in environmental sound. In addition, we have to solve a problem for multiplex reflections and diffraction waves. And, in estimating the location of the noise source by the MUSIC method, their factors strongly influence estimation precision. In the arrival direction of the acoustic waves, we used the space average method in MUSIC method and performed the measurements with the high precision as the results.
In other measurement by use of the three dimensional acoustic intensity that constructed by four electret condenser microphones, we estimated the direction of the acoustic intensity. And, from acoustic intensity measured at the three different locations, we estimated the sound noise source.
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