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임용현(Y. H. Im),이상욱(S. W. Lee),전소연(S. Y. Jeon),황성호(S. H. Hwang) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
Performance analysis of the hydraulic actuators is widely used through various experiments or simulations with modeling. In the case of modeling of hydraulic components, various parameters are required and precise measurements or complex experiments are often necessary to get these parameters. Especially, a lot of trial and errorare required to obtain the modeling parameters of a hydraulic motor which is combined with hydraulic components and mechanical elements because of the nonlinear characteristics. To solve this problem, various modeling methods were proposed using statistical techniques instead of analytical techniques. In this paper, a modeling method for a swing motor of an excavator is proposed using artificial neural network, which is composed of a hydraulic motor and various functional valves such as relief valves, makeup valves and antirotation valve, etc. The model for a target swing motor was constructed using artificial neural network, in which the simulation results using commercial software were used as training data. The constructed model was verified by comparing with the computer simulation results through the known Amesim model.
굴삭기용 선회 모터의 가속시 소음 진동 개선을 위한 밸브 플레이트의 설계에 관한 연구
이승현(S. H. Lee),진정만(J. M. Jin),소순재(S. J. So) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
Flow and pressure ripple in swash plate type piston motors is largely dependent on the design of notches. The basic design concept for notches in the valve plate could be said to be established for the general solution of flow and pressure ripple In this paper, it was lead theoretical formular to identify the major parameters caused the vibration and noise in the time of accelerating operation for swing motor and proposed the method of solution by return hole in notch of valve plate. also the effect for design of return hole in notch is prooved through the bench test considered inertio load according to excavator operating condition.
고부하 하이브리드 시스템의 연료 소모량 해석 시뮬레이터 개발
이대흥(Daeheung Lee),서호원(Howon Seo),김남욱(Namwook Kim),임원식(Wonsik Lim),차석원(Sukwon Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Hybrid system, which has been successfully used in vehicles, is introduced to conventional hydraulic excavators in these days. The purpose of this research is to evaluate the effect of hybridization using optimal theory (Dynamic Programming), when hydraulic swing motor of conventional excavator is replaced by electric motor. And also, on the analysis results, we deduce basic control logic about power distribution and apply it to the simulation program of hybrid excavator. We introduce two structures of hybrid excavators, and the best fuel consumption is solved from Dynamic Programming, which guarantees the minimum fuel consumption. And then, to apply control logic based on the analysis results, we develop the forward simulator program using AMESim and Matlab Simulink.