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이장명(C. M. Lee),권오상(O. S. Kwon) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.4
The sound quality of the car audio system is affected by the serveral factors such as the dimen sions of the room, the boundary condition of the wall, the location of the speakers, etc. Among these factors, the location of the car speakers has been focused to find the best location of the car speakers assuming that the flat response is better. To verify the suggestion, the subjective test is adopted using 10 people. The developed method is utilizd to evaluate the function of the audio system with fixed speaker position.<br/>
이장명(C.M.Lee),김상호(S.H.Kim),서호철(H.C.Seo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
To verify the Finite Element Method(FEM) model of an Exhaust System, Frequency Response Function(FRF) is utilized. Up to now. generally. comparisions of natural frequencies and mode shapes of an Exhaust System between numerical analysis and experimental result are adopted to prove completion of FEM model. However. the comparisions of natural frequencies and mode shapes are not sufficient to have a perfect FEM model of an exhaust system. Instead of these comparisions. FRF method is introduced for a perfect FEM model.<br/>
이장명(C. M. Lee),권오상(O. S. Kwon) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.1
The application of the 4-pole parameter method with 1-D theory is acceptable for intake system analysis. However, the limitaion appears during the analysis of complicated intake system since this method is developed based on the plane wave thoery. For the intake system analysis, the usage of BEM(Boundary Element Method) is introduced describing its disadvantage. To combine benefits of both method, a hybrid method is introduced. This hybrid method consists of the 4-pole parameter with 1-D theory and BEM. The developed method is applied to an automobile intake system analysis to obtain the transmission loss.
배기계 Hanger 위치 결정 및 Bellows효과에 관한 연구
이승섭(S.S.Lee),이장명(C.M.Lee) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The hanger posi tions of the exhaust system can be determined to minimize the energy transferred into a body by the normal mode analysis of the total exhaust system using the Finite Element Method.<br/> During this procedure, the bellows effect is also studied using the forced vibration analysis. In this article, these analyses are performed below 200 Hz, equivalent 6000 rpD based on the 2nd order component of a four cylinder engine.<br/>