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[論文] 음향인텐시티법을 이용한 4기통 가솔린 엔진의 소음원 검출에 관한 연구
오재응(J.E.Oh),박호(H.Park),이완익(W.I.Lee),조진호(J.H.Cho) 한국자동차공학회 1989 오토저널 Vol.11 No.1
본 연구에서는 음향 인텐시티법을 가솔린 엔진에 직접 적용하여, 각각의 중심주파수별 음향 인텐시티 음답특성을 1/3 옥타브 밴드로 구하였고,오버을 레벨 및 최대 인텐시티레벨을 갖는 중심주파수에서의 음향 인텐시티 방사특성을 등고선 및 3차원 표시로 나타내었다. 또한 그 결과를 분석 및 고찰하여 엔진의 중요 소음원을 검출하므로서 이 수법이 소음대책에 유효하다는 것을 검증하였다.<br/> 연구 결과, 오버올 레벨에서는 아이들링 상태의 경우 엔진 전면부에서, 2.000rpm 상태의 경우 엔진 우측부에서 가장 높은 읍향 인텐시티가 방사되었으며, 최대 인텐시티레벨을 갖는 중심주파수에서는 오일팬과 홉ㆍ배기매니홀드가 100Hz에서 가장 높은 음향 인텐시티를 나타내었다. Acoustic intensity method is applied to a 4-cylinder gasoline engine in order to identify the noise sources and the response characteristics. Acoustic intensity is analyzed by 1/3 octave band filter for each center frequency. Radiational characteristics of acoustic intensity at overall and the maximum intensity level are represented by using the contour and three-dimensional plot. It is verified that this method is effective to the assessment of engine noise.<br/> It can be found that the maximum intensity is radiated from the front side of the engine under idling condition and the right side of it under 2,000 rpm running with no loading condition at overall level, and also that the maximum intensity is radiated from the oil pan and the intake and exhaust manifold at the center frequency of 100 Hz.<br/>
신문균(M.K.Shin),박경진(K.J.Park),이완익(W.I.Lee),김형중(H.J.Kim),정근섭(K.S.Jung) 한국자동차공학회 1992 오토저널 Vol.14 No.2
Real automobiles have been utilized to study the occupant behaviors and the response of the structures in the crash environment. Since various parameters are involved in the automobile crashworthiness, a number of experiments must be conducted. The experiments have been contributed to increasing the cost due to the fact that the test is quite expensive. Therefore, computer simulation is adopted to reduce the number of experiments. A few computer programs have been developed specifically to solve the occupant responses in the crash environment. In this research, a software is used to study the occupant dynamic analysis. A modeling of occupant analysis is established for a passenger car and the results are verified through comparisons with real experiments. In the modeling, data are tuned very carefully so that the simulated results such as HIC (Head Injury Criterion) and acceleration of each body may approximate to the experimental results. The compared experiment is a barrier test which is carried out by frontal impact. A feedback to the design process is suggested from the result of this research.