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Active Contact Flange를 이용한 표면 가공 작업 도구 힘 제어에 관한 연구
윤진수(J. S. Yun),박용수(Y. S. Park),곽경신(K. S. Kwak),김성탁(S. T. Kim),박서준(S. J. Park),양순용(S. Y. Yang),안경관(K. K. Ahn),박진상 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
Active Contact Flange (Active Contact Flange) is a device installed between the robot arm end effector and the robot arm to maintain a constant force between the workpiece and the tool. ACF is able to maintain a constant force in the surface machining operation, which gives positive results for control. In the existing surface processing automation operation, the force and the position are controlled simultaneously, so performance degradation is predicted. In this paper, we propose an ACF device that can control unstable forces separately. ACF can be expected to have more positive effects in terms of economy, efficiency, and environment compared to hydraulic cylinders using hydraulic oil. Since there is non-linearity in the air, this paper controls the force using a suitable sliding mode control. In the case of the existing PID controller, it is simple and has excellent performance, but it is difficult to control the uncertainty of the disturbance due to the fixed gain. Therefore, the sliding mode controller was applied to increase the control performance of uncertainty in disturbance, and force control was performed. As a result, force control was implemented without using a servovalve, and it was confirmed that it is possible to maintain contact force for surface processing.
피복재 공급온도가 광섬유 피복두께에 미치는 영향에 대한 전산유동해석
최진수(J.S. Choi),곽호상(H.S. Kwak),김경진(K. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Fiber coatings are essential in optical fiber manufacturing, since they provide the protective layers from the surface damages and the adequate fiber strength. Flow and temperature fields of coating liquid in a fiber coating applicator are numerically investigated by using a commercial CFD software. The main focus of this computational study is on the thermal effects by viscous dissipation and the effects of coating supply temperature on the final fiber coating thickness. The numerical results reveal that the thermal effects play a major role in the high-speed optical fiber coating process and give substantial influences on the determination of coating thickness. Changing the supply temperature of coating liquid is found to relieve the radial variation of coating liquid viscosity in the coating die and it can be an effective way to control the fiber coating thickness.
복합형 하이브리드 유압 파워트레인 시스템을 이용한 굴삭기 시스템 제안 및 효율 향상에 관한 연구
박용수(Y. S. Park),윤진수(J. S. Youn),곽경신(K. S. Kwak),김성탁(S. T. Kim),박서준(S. J. Park),안경관(K. K. Ahn),D. T. Cuong 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.12
With the recent emergence of fossil fuel depletion and environmental pollution issues internationally, the construction and industrial heavy equipment sectors are required to develop technologies to reduce emissions and energy consumption. Currently, research on energy saving in construction machinery is being actively carried out to solve these problems, and hybrid systems, including energy recovery, are one of the most popular energy solutions. This study proposes a combined hybrid hydraulic system, including power distribution devices, and various operating modes to increase energy efficiency. And also builds simulation models through Amesim-Simulink Cosimulation. Afterwards, the control strategy is established using fuzzy control and optimized using genetic algorithms to maximize the energy efficiency of the system. The proposed system and control strategy are verified by experiment.
통합형 인 라인 오일 모니터링 센서의 제철설비 현장 적용사례
공호성(H. Kong),한흥구(H.G. Han),곽진수(J-S. Kwak),장원수(W-S. Chang),임경근(G-G. Im) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
One of the important trends for condition monitoring in the 21st century is the development of smart sensors that will permit the cost-effective continuous monitoring of key machine equipments. In this study, an integrated in-line oil monitoring sensor assigned for continuous in situ monitoring multiple parameters of oil performance is presented. The sensor estimates oil deterioration based on the information about chemical degradation, total contamination, water content of oil and oil temperature. The oil oxidation is estimated by “chromatic ratio”, total contamination is measured by the changes in optical density of oil in three optical wavebands (‘Red’, ‘Green’ and ‘Blue’) and water content is evaluated as relative saturation of oil by water. In order to evaluate the sensor's effectiveness, the sensor was applied to several used oil samples in steel making industry and the results were compared with those measured by standard test methods.
통합형 인-라인 오일 모니터링 센서의 제철설비 현장 적용사례
공호성(H. Kong),한흥구(H.G. Han),곽진수(J-S. Kwak),장원수(W-S. Chang),임경근(G-G. Im) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
One of the important trends for condition monitoring in the 21st century is the development of smart sensors that will permit the cost-effective continuous monitoring of key machine equipments. In this study, an integrated in-line oil monitoring sensor assigned for continuous in situ monitoring multiple parameters of oil performance is presented. The sensor estimates oil deterioration based on the information about chemical degradation, total contamination, water content of oil and oil temperature. The oil oxidation is estimated by "chromatic ratio", total contamination is measured by the changes in optical density of oil in three optical wavebands ('Red', 'Green' and 'Blue') and water content is evaluated as relative saturation of oil by water. In order to evaluate the sensor's effectiveness, the sensor was applied to several used oil samples in steel making industry and the results were compared with those measured by standard test methods.