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이용범(Y. B. Lee),고재명(J. M. Ko),박종호(J. H. Park) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.2
Hydraulic excavator consists of booms, arms, bucket, and cylinder. The cylinder make these structures moved and the cushion parts of cylinder in operation absorb the great impact which is stemmed from high velocity and pressure at cushion parts of cylinders. The cushion technology of cylinders has a great effect on the operator’s comfortable as well as protecting equipment from damage by suppressing the inertia of the hydraulic excavator. In this study, three hydraulic cylinders have different shapes of a cushion ring, respectively. we studied optimal cushion pattern by analyzing the change of cushion pressure and time, according to supply pressure and velocity variations.
이용범(Y. B. Lee),이기천(G. C. Lee),이종직(J. J. Lee) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
Torque and revolutions are measured by using a rotary torque meter to measure the performance of hydraulic pumps and motors. It is only necessary to ensure the accuracy of the torque meter in order to check whether the measured performance of the products to be measured is improved or not. However, the measurement error of the same product is large due to noise, and it can be happen that the efficiency may exceed 100 %. Based on analyzing the characteristics of static torque calibration problems and line & system noise problems, this study analyzed the torque measured data after filtering by software filter adopted with cut-off type noise filter and hardware filter adopted with low & high frequency band noise filter for securing the high precision torque measured data. A new concept of a digital pulse transmission type torque meter was developed and tested in order to overcome the limitation of voltage transmission method of the conventional transformer type.
유압 서보 액추에이터의 주 고장 모드 분석 및 수명 개선에 관한 연구
이용범(Y. B. Lee) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.5
The hydraulic servo actuator has operated very precisely with high frequency and small displacement, and it used for a long time continuously. Recently, the hydraulic servo actuator of the test equipment which is utilized in the accelerated life test in order to guarantee the service life of the automotive parts has failed earlier than the products before finishing the test. This study performed the analyzing the cause of the failure mode of the hydraulic servo actuator used in the test equipment, changed the design of the actuator to solve the root cause of the main failure mode, and developed the improved servo actuator. Based on above process, this study found out the better performances and longer lifetime of the servo actuator after testing.