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임원식(W. S. Lim) 한국자동차공학회 1998 한국자동차공학회 학술강연초록집 Vol.1998 No.9
For the analysis of torque converter, the one dimensional performance model, which is based on the concept of constant mean flow path and constant flow angle, has been used. The assumption of constant parameters make the procedure of analysis and design simple. Because the constant parameters have not exact physical meaning, the correction factors have been used in practise. But the correction factors also have not physical meaning. So, the modelling with 'variable parameter is needed to consider the contribution of parameters on performance. In this study, the determination algorithm of variable equivalent parameters is presented for the analysis of the torus flow and the variable flow angle. To set the objective function of optimization, the torque converter was modeled in detail. The parameter determination algorithm is based on the nonlinear optimization and the the initial values of parameters may be supplied. So, the geometric analysis was carried out and the effects of oil temperature was analyzed before optimizing. Using the determined parameters, the torus flow and the behaviour of flow angle is predicted.
변속과도특성해석을 위한 토오크 컨버터의 동적 모델링에 관한 연구
임원식(W.S.Lim),박영일(Y.I.Park),이장무(J.M.Lee) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Nonlinearity of the torque converter, the important part of the automatic transmission, IS the important ingredient which determines the nonlinearlity of the vehicle in shift performance. But the studies on the torque converter<br/> have been concentrated on the analysis of the steady-state, and the analysis of the transient state is not well developed because of the complexity of the analvsis.<br/> In this study, nonlinear equation of motion of the torque converter was<br/> developed using the momentum equilibrium equation and energy equilibrium equation to investigate the shifting transients of the torque converter<br/> equipped vehicle. Modeling of power transmission system was developed, and the simulation program was made for the analysis. And, dynamic design parameters of the torque converter were identified from fitting the modified equation of motion on the experimental performance curve. In the simulation which adopts these parameters. the validity of torque converter modeling was proved through the experiment on dynamometer.<br/>
토크 컨버터의 등속 상태 성능 실험을 통한 등가 파라미터 결정 방법에 관한 연구
임원식(W.S.Lim),최천(C.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
For the analysis of torque converter, the one dimensional performance model, which is based on the concept of constant mean flow path and constant flow angle, has been used. The assumption of constant parameters make the procedure of analysis and design simple. Because the constant parameters have not exact physical meaning, the correction factors have been used in practise. But the correction factors also have not physical meaning. So, the modelling with variable parameter is needed to consider the contribution of parameters on performance.<br/> In this study, the determination algorithm of variable equivalent parameters is presented for the analysis of the torus flow and the variable flow angle. To set the objective function of optimization, the torque converter was modeled in detail. The parameter determination algorithm is based on the nonlinear optimization and the the initial values of parameters may be supplied. So, the geometric analysis was carried out and the effects of oil temperature was analyzed before optimizing. Using the determined parameters, the torus flow and the behaviour of flow angle is predicted.<br/>
차량 동특성 개선을 위한 현가 장치 tunning에 관한 연구
이인학(I.H.Lee),임원식(W.S.Lim),최천(C.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In this study, to improve the ride and handling characteristics of the vehicle which of H/P has been already fixed, a tunning method of load spring, damper and stabilizer bar is described. For the suspension of vehicle, optimized design is necessary to satisfy the incompatible two dynamic characteristics, ride isolation property between unsprung mass and sprung mass to reduce the excitation from the road and accurate cornering response property to specific steering inputs. To accomplish above aims, we may approach by experimental method, but it requires to sacrifice much time and cost. In this paper, therefore, provides a process of suspension development to improve ride and handling properties by using computer simulation with saving time and cost, and as results, compares the dynamic characteristics of the tunned vehicle with the base vehicle not tuuned.<br/>