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노대경(D. K. Noh),장주섭(J. S. Jang),서자호(J. H. Seo),김흥섭(H. S. Kim),박승현(S. H. Park) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.3
The goal of this study drifter is to understand the operating mechanism of a drifter and to suggest a reliable analysis model which can be used for evaluating the drifter’s performance from the viewpoint of impact frequency and energy. For this, the working principle of drifter and functions of its main components were analyzed, and a simulation model was developed based on the analysis. The model was validated using experimental tests on a test-bench. A comparative study of simulation and experimental results indicated that the suggested model accurately represents the real drifter system in terms of impact frequency and impact energy per blow.
노대경(D. K. Noh),김명보(M. B. Kim),강영기(Y. K. Kang),장주섭(J. S. Jang) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
As core component of hydraulic drill, drifter repeats impact movement. This study covers impact performance optimization of drifter. The following are progress processes. First, an analysis model, which is capable of predicting dynamic behavior of drifter, is developed through commercial software SimulationX. Second, parameter sensibility is analyzed and impact performance is optimized by utilizing EasyDesign, a commercial optimization software. Third, a confirmation work is conducted to ensure that optimization is done right after comparing before with after. Finally, impact efficiencies before and after optimization are compared, reflecting condition of system which will be equipped with drifter.
노대경(D.K. Noh),장주섭(J.S. Jang),박승현(S.H. Park),박진선(J.S. Park),김흥섭(H.S. Kim),서자호(J.H. Seo) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.4
The drifter is the gear that break rockmass with rotation and repeated impact. Compared to hydraulic breaker that is operated by same mechanism, the drifter’s impact frequency is so high that excellent technical skills are needed when it is developed. This study, which aims to develop advanced company’s efficiency analysis model and review it’s reliability through real impact test is fundamental for localizing drifter. The tool for developing analysis model is SimulationX, commercial software.
노대경(D. K. Noh),장주섭(J. S. Jang) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.4
Recently, hydraulic motor is getting the spotlight. It is resulted from rapid civil engineering public works by a lot of developing countries around the world. In this study, we divided the valves which are affixed in the hydraulic motor into some parts, implemented them through computer simulation, verified validation of each component, and analyzed behavior adding driving condition. Through the analyzed results with general driving condition, we found the reason why behavior became unstable as the motor had started spinning. Through the analyzed results with tough driving condition, we verified that the valve works well with it"s production purpose.
노대경(D. K. Noh),정동수(D. S. Jung),장주섭(J. S. Jang) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.6
This study is about developing step of HCVT (Hydromechanical continuously variable transmission) analysis model which would be used in a heavy duty truck. The analysis model should fulfil the following conditions. First, it should reflect specs on an assembly drawing. Second, it should predict possibility of materializing system. Third, it should characterize feature like oscillation. Finally, it"s form should be similar to graph which has been found out academically. We use SimulationX to develop analysis model.
김동명(D. M. Kim),노대경(D. K. Noh),장주섭(J. S. Jang),윤영환(Y. H. Yoon),김용주(Y. J. Kim),김수철(S. C. Kim) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
The neutral valve as the controller of HST is one of important valves for the vehicle control. The neutral valve is the valve performing the role to transmit or block the power to the vehicle. The logical validity has been investigated by analyzing the serve circuit through the development of analytical model of neutral valve. The modelling used the simulationX as the commercial software. The analysis for the number of piston hole of Orifice Diameter, the size of pressure pulsation and the initial amount of compression have been performed in the sensitivity analysis of each design variable of this study.
단계적 가변 메카니즘이 적용된 지능형 브레이커의 기술 제안
이대희(D. H. Lee),노대경(D. K. Noh),장주섭(J. S. Jang) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
If the impact mode can be changed automatically to obtain the optimum impact energy according to the strength of the rock during the crushing operation using the hydraulic breaker, the working efficiency of the breaker can be improved. Thus, the aim of this study is to implement an auto-sensing hydraulic breaker that automatically change of 4-step impact mode according to the rock strength through the development of the analysis model, and the analysis model is modeled using SimulationX. The analysis model of auto-sensing breaker with the 4-step variable mode was developed based on the analysis model of auto-sensing breaker with the 2-step variable mode developed in the previous research. From the analysis results, it was confirmed that the stepwise variable of the impact mode is implemented according to the rock strength. This study is expected to contribute to the development of hydraulic breakers one step ahead of existing auto-sensing breaker that only have 2-step variable impact mode.
주리라(R. R. Ju),노대경(D. K. Noh),장주섭(J. S. Jang) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
Most hydraulic systems that require a large power is widely used in machinery and equipment. However, an analysis of the hydraulic system is not working correctly compared to the wide applications. In this paper are discussed block molding machine hydraulic circuit diagram of the system should do when designing creating in depth analysis of the system have been omitted. Therefore, to identify the components of the machine and analyzed using commercial catalog data. This interpretation through a process of Block molding machine problem analysis and system improvement through analysis of the state is suggested.