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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.
임원식(W. S. Lim),박영일(Y. I. Park),이장무(J. M. Lee) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.6
In automotive industries, one of the major issues is the shifting shock, which is brought out when two clutches are engaged in an automatic transmission. The engagement and disengagement of two clutches means the variation of the D.0.F(degree of freedom) of system. Therefore to analyze the shifting performance, the variation of D.Q.F should be considered in detail. Generally, the programs for analyzing the shifting transients have been developed as the problem-dependent codes because the artificial marks were usually used to indicate the change of shifting phase. To develop a soft-ware applicable to a general mechanism of transmissions, a self-determining algorithm of D.O.F must be applied.<br/> Through the experiences for the last several years, a generalized analysis software of shifting mechanism(so called by POTAS-MSM Version 2.0) has been developed. In this study, some major ideas of the software and the concept for the analysis of shifting characteristics are presented. In addition to that, this paper shows how to self-determine D.O.F of he multi-slipping systems using the stick-slip criterion on a single slipping mechanism. By using this software, the shifting charac-teristics of a vehicle are analyzed and compared with the experimental results.<br/>
임원식(W. S. Lim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.5
The performance of a torque converter can be expressed by the performance parameters such as flow radius and flow angle, on the mean flow path. The geometric analysis of the torque converter is required to determine these parameters for the modeling of the torque converter. In general. the blade shape is depicted by three dimensional data at the mid-surface of blade or those of the pres-sure and suction side. To generate three dimensional model of the blade using the data mentioned above, a consistent data format and a shape generation algorithm are required.<br/> This paper presents a useful consistent data format of the blades and an algorithm for the geo-metrical shape generation. By the geometric analysis program to which the shape generation algo-rithm is embedded, the variation of blade angles in rotating element analyzed. Then finally, the ana-lyzed results of geometric profile of a blade are compared with those of the blade design principle. so called forced vortex theorem.<br/>
임원식(W. S. Lim),이동준(D. J. Lee),이장무(J. M. Lee),박영일(Y. I. Park) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
To improve the efficiency of a power transmission system with slip elements, power split/circulation system is applied. The performance of a power split/circulation system varies widely by the change of the followings; the layout of system, the type and gear ratio of planetary gear, the performance of slip element, etc. Therefore, when one designs such a power transmission system or when one determines the economic/power mode of system, a certain performance prediction method is needed. In this study, the internal power flow pattern of a power split/circulation system is theoretically analyzed on several transmission systems. And an effective performance prediction method(so called performance locus diagram) is presented. By this method, the effects of design factors can be easily understood and the qualitative performances of system can be clearly evaluated.
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/>
조한상(H. S. Jo),임원식(W. S. Lim),이장무(J. M. Lee),김정윤(J. Y. Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.1
Automatic transmission for heavy duty vehicles is a part of the power pack which includes steering and braking systems. This transmission is different from the one for passenger car. Therein order to understand the trend of the important design parameters, maneuverability, acceleration performance and maximum speed, we need to analyze the total performance characteristics of the power transmission systems. In this study, modeling of the automatic transmission in heavy duty vehicle is carried out and the performance analysis method is presented. Results can be used for performance estimation data in the analysis for several combinations of engines and transmissions. Performance sensitivity analysis is also carried out by optimization method which determines the optimal parameters on the basis of penalty functions and weightings. And the estimation method of the important performance parameters such a s engine inertia or power loss of engine by experiments is presented.