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이성렬(S. L. Lee),김종혁(J. H. Kim),홍예선(Y. S. Hong),김병곤(B. K. Kim),문진삼(J. S. Moon),문준혁(J. H. Moon) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.2
In order to design a swash plate type pump for electro-hydrostatic actuators the performance of the hydrostatic piston shoe bearings in the low speed range needs to be examined, since the pump operates frequently at low speeds, compensating for position control errors as a control element. As a common practice, piston shoes are equipped with inner rings as an auxiliary element to enhance their tribological performance. In this paper, the effects of the inner rings of the piston shoes on the frictional loss and leakage flow rate were investigated, where three piston shoe models, with different inner ring shapes and different inlet orifice sizes, were integrated. The test results showed that a large inner ring and small inlet orifice were advantageous for reducing both the frictional loss and leakage flow rate; this could also be confirmed by computational analyses.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y. S. HONG),권용철(Y. C. Kwon),김종혁(C. H. Kim),이성렬(S. L. LEE),김병곤(B. K. Kim),문진삼(J. S. Moon),김재환(J. H. Kim) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for the position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as the wear rate of sliding components, such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were engendered by a frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons along with its effects were demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
지상원(S. W. Ji),오재민(J. M. Oh),정은석(E. S. Jeong),김병곤(B. K. Kim),이일영(I. Y. Lee) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.1
For testing a newly designed ship"s steering gear, a steering gear test bench with a steering gear to be tested and a load generation part should be prepared. The load given to the steering gear has to be pertinent to the load generated in a targeted ship. In this study, the authors suggest a process of estimating the load given to steering gears in ships. At first, a test for measuring the load in the steering gear of a real ship was conducted. Then, a process was developed to compute rudder driving torque and force by using basic equations including some empirical equations on ship"s steering. The test results and the computation results on the load in the steering gear were compared, As a result, the process suggested in this study for estimating load in ship"s steering gears was verified.