| Project/Area Number |
04556037
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業機械
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MURATA Satoshi Agriculture, Kyushu University Professor, 農学部, 教授 (30038187)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJI Takashi Agriculture, Assoc.Prof., 農学部, 助教授 (50128055)
KAWANO Toshio Agriculture, Assist.Prof., 農学部, 助手 (60224812)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 1994: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥6,700,000 (Direct Cost: ¥6,700,000)
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| Keywords | noise / phase inversion / noise contral / drying / dryer / drying facility / decibel / farm processing facility / デジベル |
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| Research Abstract |
The noize of 43 points around a unit dryer and 23 points in a country elevator were recorded.
In the laboratory tests we used FFT analyzer to analyze the frequence of sound before and after using reverse sound for the measuring points. we took seven samples, the 0,45,90,135 and 180 degrees of angle and the distance of 1,5m and 3.0m around the noise source and the reversed noise source of the speaker were measured and analyzed by the FFT.The results indicated from about 10 (dB) to 20 (dB) reduction of noize level by the reversed noise generation. The reversed noise by a speaker in the exhaust duct for dryng air actually reduced the exhaust noise by about 2 dB.
The similation of noize cancelation by reversed noise were developed, and using the recorded measured noise source the noise reduction characteristics similar to the preseding experimental results were obtained. The simulation was also suggestive of some effective method of noise control.
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