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RISS 인기검색어
- 검색키워드
- 저자 : 이용범 ( Y. B. Lee ) (검색결과 158 건)
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이용범(Y. B. Lee),고재명(J. M. Ko),한성건(S. K. Han),김정훈(J. H. Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The great impact is arisen by inertia at both ends which booms, arms, bucket, and hydraulic cylinders finish their stroke due to the joint structure of hydraulic excavator. This impact make fatigue of equipment and reduce the comfortable to ride in. This mechanical inertia energy is converted to fluid energy by cushion installed in hydraulic cylinder which induces high pressure(200~400% of commercial pressure) in a moment, and then the fluid energy again converted to heat energy through orifice. Therefore, the cushion technology of hydraulic cylinder has a great effect on operator's sensitivity(operator's comfortable to ride in) as well as protection for equipment damage by suppressing the inertia of hydraulic excavator. In this study, 3 hydraulic cylinders were used and installed different cushion ring and cushion plunger in them. And we studied optimal cushion pattern by analysis of change of cushion pressure and time according to velocity and pressure variations.
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원통다관식 열교환기의 압력 변화에 따른 설계 응력 연구
이용범(Y. B. Lee),한성건(S. G. Han),고재명(J. M. Ko) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.2
Shell-and-tube type heat exchangers are generally classified with fixed tube-sheet and floating tube-sheet heat exchangers. In this paper, we employed the fixed tube-sheet heat exchangers. We theoretically investigated the safety evaluation of our shell-tube heat exchanger by axial, bending and equivalent stress of fill tubes, tube plates, channels and shell. Design pressure ranges were chosen pressure(0.6~2 ㎫) on tube side and 200 %(3 ㎫) of Maximum pressure on shell side for safety evaluation of heat exchangers. This research will be useful for fabrication of heat exchangers to prevent against damage hazard of heat exchangers in operation.
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발전소용 스팀제어밸브와 유압서보액추에이터의 고장원인분석 및 개선에 관한 연구
이용범(Y. B. Lee),이기천(G. C. Lee),박종원(J. W. Park),김태석(T. S. KIM),이종직(J. J. LEE),양종대(J. D. Yang) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.6
In nuclear and thermal power plants, turbine output control, a special steam valve that is opened with a hydraulic servo actuator and closed with a large steel spring, is used in high pressure and low pressure steam turbines. This steam control valve should supply an adequate amount of steam during normal power generation operation, but should protect the turbine rotating at high speed (Nuclear power plant 1800 rpm, thermal power plant 3600 rpm) by cutting off the steam supply quickly when an error occurs in the power generation system. This study analyzes the failure of the steam valve in the turbine output control system and the failure of the hydraulic servo actuator that operates the steam valve, and summarizes the results of the improvement.
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