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이득원(Deuk Won Lee) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
본 논문은 철도차량의 AC/DC 자동 절환 시스템에 관한 것으로서, GPS 와 신호장치, TCMS 를 연계하여 AC/DC 절환을 자동으로 행할 수 있도록 하는 시스템에 관한 것이다. 1 호선, 4 호선에 AC/DC 구간이 공존하고 있어 기관사가 수동으로 AC/DC 절환 하여야 하지만 기관사의 오조작 또는 조작을 실념(失念)하였을 때 모진이라는 중대한 사고를 일으키는 등의 문제가 발생하고, 이를 예방하는 회로 설계가 필요하다. 또한, 현재 철도차량은 신분당선, 인천 2 호선과 같은 무인 운전 시스템의 차량이 늘어가고 있지만, 아직까지 무인 운전시스템의 차량은 AC 전용 또는 DC 전용으로 설계가 이루어졌기 때문에 AC/DC 겸용의 철도차량에 무인운전 시스템이 적용된 경우가 없었다. This thesis is mainly of AC/DC changeover, specifically describes system which enables it automatically by integrating GPS, Signaling and TCMS. Even though drivers in charge of Line 1 and Line 4 have responsibility for AC/DC manual switching, preventive circuit is still strongly required due to electric accident taking place when drivers cause mal-operation. In addition, while the number of automatic operation system EMU such as New-Bundang Line, Incheon Line 2 is in tendency of increase, all of them are designed to take either AC or DC only, and there has been no precedent of automatic AC/DC switching EMU in Korean railway industry. Therefore, automatic AC/DC switching shall be developed in advance before applying automatic operation system on AC/DC two-way EMUs.
이득원(Deuk-Won Lee),이철희(Chul-Hee Lee),윤혁채(Hyuk-Chae Yun),조원오(Won-Oh Cho),김교헌(Gyo-Heon Kim),박정률(Jeong-Ryul Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Generated axial force (GAF) due to internal friction of driveshaft joint is one of the causes generating the shudder of vehicle. It also causes vibration problem on steering wheels of vehicles during idling. In this study, automated test machine is developed to precisely measure the GAF caused by internal friction in constant velocity joints. As the developed machine can control the temperature of joint, loading torque, angle of rotation and joint angles, actual vehicle driving condition can be applied. In order to validate the developed constant velocity joint tester, GAF is compared by using different types of grease in tripod joints. Also GAF is measured for both on new and used constant velocity joints to be compared and analyzed. The test result shows the repeatability and consistency of the test machine in terms of the different test conditions. By using the constant velocity joint tester, friction performance of the joint can be evaluated by proposing the best constant velocity joints as well as greases generating lowest GAF.
이득원(Deuk-Won Lee),이철희(Chul-Hee Lee),김철현(Cheol-Hyun Kim),조원오(Won-Oh Cho) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.4
In this study, friction characteristics using elastomeric actuator with Magneto-rheological (MR) materials are identified. Typically, Magneto-rheological materials are divided into two groups by MR fluid in fluid state and MR elastomer in solid state like rubber. The stiffness characteristics of Magneto-rheological material can be changed as magnetic field is applied. MR fluid has been applied to various industry fields such as to brake, clutch, damper, engine mount and etc. However, MR fluid has been used under the sealed condition to prevent leaking issues. In order to overcome these problems, MR elastomer that has same property as MR fluid has been developed and studied. MR elastomer mainly consists of polymer material such as natural rubber or silicon rubber with particles that can be polarized with magnetic field. And it is called as a smart material since its stiffness and damping characteristics can be changed. In this study, MR elastomer is produced and pin-on-disc tests are carried out to identify the friction characteristics of the material. Several test conditions are applied to evaluate the feasibility to use as a smart actuator in the field of vibration control.