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손병길(B. G. Son),김현모(H. M. Kim),류하오(H. Liu),이재천(J. C. Lee),윤장원(J. W. Youn) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
The vehicle dynamics modeling of a forklift is necessary to improve the shift quality of the transmission. This study presents the modeling of power transmission of a forklift from the engine to the wheels including torque converter, clutch and gear train, hydraulic control system and final drive differential axle using AMESim. Simulation results show that the modeling proposed in this study is useful to analyse and optimize the shift quality of the transmission for a forklift.
직접제어 방식을 적용한 소형 지게차 변속 시뮬레이션에 관한 연구
정영만(Y. M. Jeong ),윤장원(J. W. Youn),양순용(S. Y. Yang) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
The transmission control method of small forklift is classified into pilot control method and direct control method. In pilot control method, the hydraulic circuit which consists a lot of components is very complex so the production process is too costly and time consuming. The direct control method contains fewer components that can be configured to simple hydraulic circuit. It has more advantages because the shift sensitivity of transmission is changed easily via the input profile. Therefore, the study of the characteristics of direct control method is demanded to applied the development of hydraulic system design. This paper will present the simulation of direct control transmission by using AMESim. At first, the modeling of direct control method is obtained and simulated with the real parameters. Second, the simulation results are carried out and compare with the experiment result to verify and analysis the characteristic of the direct control method.
인공신경회로망을 이용한 전자비례 감압밸브의 솔레노이드 형상 최적화
윤주호(J. H. Yoon),웬민냣(N. M. Nhat),이현수(H. S. Lee),윤장원(J. W. Youn),김당주(D. J. Kim),이동원(D. W. Lee),안경관(K. K. Ahn) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.6
Unlike the commonly used On/Off solenoid, constant attraction force--which is independent of plunger displacement is a considerably important characteristic to proportional solenoid of the EPPR Valve. Attraction force uniformity is mainly affected by the internal shape design parameters. Due to a number of shape design parameters, the optimal parameter values are very complex and time consuming to find by trial and error method. Much research has been conducted or are still in progress to find the optimal parameter values by applying various optimization techniques like Genetic Algorithm, Evolution Strategy, Simulated Annealing, or the Taguchi method. In this paper, the design parameters which have primary effects on the attraction force uniformity and the average attraction force are decided by main effects analysis of Design of Experiments. Optimal parameter values are derived using finite-element analysis and a neural network model.