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Center Position Control for Steel Machine Using Electro-Hydraulic Actuator
안경관(K. K. Ahn),윤종일(J. I. Yoon),딩광졍(D. Q. Truong),윤장원(J. W. Yoon) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
This paper presents an application of electro-hydraulic actuator (EHA) to a steel rolling machine (SRM) in order to control the center position of the roller which affects directly to the working performance. The EHA control system is developed from a conventional servo hydraulic actuator (SHA) which is currently used to control the roller center of the SRM in POSCO Corp. Based on the EHA specifications and control requirements, the EHA circuit and its components are designed. In addition, the ability of using EHA for center position control (CPC) is verified by force control performance on an electro-hydraulic test machine (EHTM) in which the reference is the working data obtained from the SHA. Experimental result proves that the EHA has strong potential to be applied for CPC of the SRM.
Modeling and Performance Investigation of Forklift Transmission Control Valve System
D. Q. Truong(딩광청),K. K. Ahn(안경관),J. W. Yoon(윤장원) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.3
In forklifts, the machine performance is largely depended on the transmission performance. The aim of this paper is to develop a complete model of transmission control valve (TMV) system of a typical forklift using AMESim simulation tool. By using the developed TMV model, it becomes easy to investigate the system concept, working principle, and performance. In addition, an optimization on the TMV structure can be achieved by using this model with tunable parameters. Simulations have been carried out in a comparison with the actual experiments to verify the model.
이현수(H.S. Lee),윤주호(J. H. Yoon),이소영(S. Y. Lee),윤장원(J. W. Yoon),안경관(K.K. Ahn) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.5
The topic of this paper is regenerative braking which is one part of energy saving of excavator. A study to maximize energy-saving-efficiency is conducted. Firstly, this paper provides mathematical modeling of regenerative braking process in detail and analyzes that in view of energy saving efficiency. Subsequently, a novel regenerative braking algorithm is proposed by using the modeling. Finally, the improvement of energy saving efficiency by proposed algorithm is verified by simulation program, AMESim.
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.