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- 저자 : 박보용(B. Y. Park) (검색결과 2 건)
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박보용,김인수,이상환,Park, B.Y.,Kim, I.S.,Lee, S.H. 대한설비공학회 1996 설비공학 논문집 Vol.8 No.3
In general, a cooling tower has two major noise sources, one is the fan and the other is the falling water. The fan noise is produced by passage of its blades through the air and radiates from the fan stack. Noises from the falling water are caused by splashing and dropping of water cascading over the internal filler of the cooling tower and into the basin and radiate from the louvered face. In this paper, the noise measurements and its frequency analysis are carried out for the locations facing the louvered side and near the fan stack referring the related code and standards in order to study the noise characteristics of the induced-draft cooling tower, especially for the buildings. As a result, it is found that for every doubling of distance from the noise source the noise level decreases by 2~4dBA in the near field with reflect surfaces and decreases by about 6dBA also in the far field without reflect surfaces. As a supplement to the noise measurements, a computer program with simple algorithm is developed in order to estimate the noise level at a distance from the cooling tower, so that the user could apply and modify it for the particular boundary conditions easily.
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김인수(I. S. Kim),박보용(B. Y. Park) 한국자동차공학회 1996 한국자동차공학회 학술강연초록집 Vol.1996 No.10
Due to the speed fluctuation of an engine-crankshaft rotational vibrations in driveline occur excessively and disturbances of valve timing for example can be caused as a consequence. This paper presents the analysis of speed fluctuation mechanism through simulation of model for the crankshaft system, and a method of speed fluctuation reduction attaching a tuned dynamic damper to the crankshaft, which shows the reduction of 9dB(66%) of speed fluctuation at the I. journal bearing improving the vibrational and acoustical quality of driveline.
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