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강희용(H.Y.Kang),김봉철(B.C.Kim),윤희중(H.J.Yun),양성모(S.M.Yang) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper a computer model of large sized truck was developed to evaluate the handling perfom1ance. The full vehicle model having 309 degree of freedom is designed to permit efficient vehicle dynamics analysis using commercial multibody dynamic program. The model is composed of steering system, suspension system, tire, frame, deck and etc. In suspension system, leaf spring showing nonliner relationship on hysteric characteristic of force and displacement is modeled. Shock absorber using spline function is modeled by non liner relationship of force and velocity. Stabilizer using beam element to consider bending and twisting effect is modeled. To evaluate handling performance, vehicle test is performed in the single lane change and J-turn as periodic and step input. The simulated result compares with the test parameter of common passenger car. The useful vehicle handling characteristic parameters in vehicle suspension design are evaluated and applied on large sized truck.
윤희중(H.J. Yun),한영희(Y.H. Han),한상철(S.C. Han),정년호(N.H. Jeong),김정훈(J. H. Kim),성태현(T.H. Sung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
For designing high Tc superconductor journal bearing(HTSJB) which is used on a flywheel energy storage system which requests the free of the bearing loss caused by the friction, it is necessary to understand the basic characteristics of the classical superconductor journal bearing because the mechanical characteristics of the HTSJB are identified by the magnetic relationships between the permanent magnet(PM) and the high Tc superconductor(HTS). In this paper, using the method, frozen image model, the force problems between the PM and the HTS were solved and then the dynamic characteristics of the rotor inside of the HTSJB can be expected in advance by using the basic characteristics between the PM and the HTS. The coefficient of friction of the HTSJB was measured in the vacuum environment. From the results, the mechanical characteristics of HTSJB can be identified using the numerical models.