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이장무(J.M.Lee),임홍재(H.H.Yim),김종현(J.H.Kim),조시기(S.G.Choi) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a computational method is presented for accurate dynamic<br/> analysis of the engine mount system that is supported by flexible foundation. Equations of motion for the engine mount system including flexible foundation are derived. The flexibility of the foundation is obtained in the form of the modal mass, stiffness matrices and mode shape vectors by performing finite element modal analysis. It is shown that the flexibiIity of the foundation has a signi ficant effect on the vibration modes and dynamic behavior of the engine mounting system.<br/>
[論文] 차량용 시트의 설계품질 향상을 위한 안전공학 및 인간공학에 관한 연구
이장무(J. M. Lee),염영하(Y. H. Yum),성명호(M. H. Sung),신승훈(S. H. Shin) 한국자동차공학회 1986 오토저널 Vol.8 No.3
The safety and comfort of car seats were studied by utilization of engineering analysis/ experiment and human engineering data. As important factors of the static seating comfort, static spring constant, body pressure distribution, driving posture were discussed. In connection with the dynamic seating comfort, vibrational characteristics of domestic car seats (natural frequencies, damping, frequency spectrum, transmission ratio) were measured and discussed. Finally, the safety of the seat was analyzed and evaluated through calculation and experiments.
이재형(J.Lee),조시기(S.G.Jho),유홍회(H.H.Yoo),이장무(J.M.Lee) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents simulation results of a vehicle with a flexible frame.<br/> The mass and stiffness data are obtained by a finite element analysis<br/> program and used in a multibody dynamics program. The vehicle<br/> consists of a sprung mass, a flexible frame, suspensions, and tires, and has total 166 degrees of freedom.<br/> The outputs are compared with those of a vehicle with a rigid frame. The results shows that reaction forces between bodies are significantly different, but displacements, and velocities are not much different for the vehicle. Acceleration is almost same at low speeds but quite different peak values at high speed. Phase lag is also observed from the results.<br/> Computational efforts needed for the analysis are compared too.<br/>
지지부의 유연성을 고려한 엔진 마운트의 동특성 해석 및 최적설계에 관한 연구
송명의(M.Y.Song),최동운(D.U.Choi),임홍재(H.J.Yim),김종현(J.H.Kim),이장무(J.M.Lee),류제하(J.H.Liu) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Using the equations of motion for the engine mount system including foundation flexibility, forced vibration analysis is carried out for the given engine mount system excited with the unbalanced force and moment using the program developed in this paper. A new optimal design method, in which modal frequencies of the supporting structure can be integrated as design variables, is presented.<br/>