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안상호(S. H. Ahn),김주연(J. Y. Kim),김규철(K. C. Kim) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.1
This paper presents the static analysis, the modal analysis and the forced vibration analysis on engine structures to find out the structure-borne noise sources by finite element method.<br/> The deformation of engine structures under the maximum combustion gas force was calculated through the static analysis, and the resonance possiblities were predicted by the modal analysis which ascertains mode shapes and the corresponding frequencies of engine global and its major components in consideration of the oil film stiffness inside main bearings. One hand, the major noise sources in engine surfaces were investigated with the forced vibration analysis by means of finding the transfer mobilities on engine surfaces due to the piston impact and the velocity levels due to the combustion in consideration of oil film stiffness and damping coefficients.<br/> Finally, the direction of engine structure-borne noise reduction can be estabilished by the above-mentioned analysis procedure and the reduction effect of cost on proto-type engine build-up is expected.
조상범(S. B. Cho),안상호(S. H. Ahn),유형선(H. S. Yoo) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.5
In this study, the optimum design is carried out upon the crankshaft of in-line 6-cylinder internal combustion diesel engine with the mechanical analysis for the layout design, which is standard calculation whose process contains quadratic curve fitting method and quasi newton method about cost function, design variables and constraint conditions. Without finite element analysis, this process in wich mechanical analysis is performed upon the most critical part in crankshaft gives necessary and satisfied output in layout design and saves time and cost in developing a new diesel engine. this study, also, the 3-dimensional finite element method is used in confirming the standard calculation for the optimization of crankshaft and the shape optimization in crankweb is obtained.
안기원(K.W.Ahn),안상호(S.H.Ahn),서권희(K.H.Seo),황원걸(W.G.Hwang),윤희석(H.S.Yoon),오철성(Q.S.Oh) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
To evaluate the safety and durability of the vehicle structure in the vehicle developing stage, many times and efforts have been required. It is difficult to find the reason of crack which was occurred in the body and frame of a vehicle during tests. Recently computer aided engineering technology has rapidly<br/> raised to solve the problems of safety and durability of the vehicle.<br/> In this study, dynamic stress analysis is performed to the frame of the vehicle by rigid and flexible<br/> multibody dynamic techniques during bump pass. The results of the analysis are compared to those of the test. The full vehicle dynamic models for the rigid and flexible body are accomplished by DADS; a special code for dynamic analysis. Dynamic stress analysis procedure is also developed using the accomplished dynamic models.