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- 저자 : 文洪晙 (검색결과 3 건)
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金寬柱,文洪晙 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
In recent years, the problems of noise and vibration are critical issues in order to reduce the weight of internal combustion engine components. It is found that the bending, torsional and lateral vibration of crankshaft are the main causes of engine noise and vibration problems. Therefore it is necessary to identify the vibration behavior of crankshaft. In this paper, the vibration analysis of hollow crankshaft was carried out. The torsional vibration characteristics of hollow crankshaft were analyzed and compared with those of same size solid crankshaft in respect of equivalent mass and stiffness by using I-DEAS. The natural frequencies and mode shapes of both crankshafts are measured by impact hammer test using LMS CADA-X system.
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Engine Growling Noise에 대한 실험적 연구
문홍준(Hongjun Moon),김영호(Youngho Kim),김인동(Indong Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study the experimental investigation was performed to identify the sources of engine growling noise and the transfer paths that are components of growling noise in the 1.61 4cylinder gasoline engine with 5 speed manual transmission in vehicle. Generally growl sounds might be present in the vehicles with manual transmission and the growl noise is audible during moderate to heavy acceleration during clutch partial to full engagement between 2000 and 2500 RPM. The growl sound is characterized by the presence of two audible tones of similar amplitude (within about 5-10 dB of each other) separated by about 20㎐. This results in the perception of a beat or modulation of the sound level. This modulation gives the "rough" character to the sound of the engine. This study describes the findings of investigation of insight into the factors contributing to growl sound indicated that primary even and odd orders and half orders were potential factors and that possibly power train flexible modes were factors. The findings of this study identify the acoustic mechanism of growl, the contributing factors from the engine combustion process, and some the structural amplification factors in associated with production of growl sound in the passenger compartment.
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SEA 기법을 이용한 저중량 흡, 차음재의 대시판넬 적용에 대한 연구
임효석(Hyosuk Lim),문홍준(Hongjoon Moon),박광서(Kwangseo Park),김영호(Youngho Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this Paper Statistical Energy Analysis has been considered to predict high frequency air borne interior noise. Insulation thickness distribution map was calculated not by measurement, but by FeGate software. AutoSEA software predicted coupling loss factor from insertion loss which was measured by using Reiter Apamat Ⅱ machine and internal damping loss factor from reverberation time according to each thickness and material density. Each predicted transmission losses between conventional insulation and light weight insulation are compared with SEA. Finally light weigh insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.
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