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NREL Phase VI 풍력발전기 저주파 소음방사 특성
모장오(Mo, Jang-Oh),김병윤(Kim, Byoung-Yun),류병남(Ryu, Byeng-Nam),이영호(Lee, Young-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The purpose of this work is to predict the low frequency aero-acoustic noise generated from the horizontal axis wind turbine, NREL Phase VI using large eddy simulation and Ffowcs-Williams and Hawkings model provided in the commercial code, FLUENT. Calculated aerodynamic performances such as shaft torque and power are compared with experimentally measured value. Performance results show a good agreement with experimental data within about 0.8%. If the distance by two times is changed from 32D to 64D toward the downstream region, sound pressure level is reduced by about 6.4dB.
최대식(D. S. Choi),김석우(S. W. Kim),김재덕(J. D. Kim),유한성(H. S. Yoo),이승배(S. B. Lee) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.12
This study is an example of each improvement activity of driver noise and sound power for a 4 ton class forklift.. To reduce the noise power of the forklift, it is necessary to reduce the noise of the cooling fan. Noise analysis was carried out by applying the optimal design of the cooling fan to simulate nature and applying the eagle wing airfoil. An analysis of noise reduction was conducted through the experimental results mounted on an actual forklift. In order to reduce driver noise, a sound absorbing and insulating material was attached inside the cabin to reduce engine radiation noise. Acoustic BEM analysis and acoustic camera equipment were used to understand the effects on sound absorbing and insulating materials.