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전동차 전선단자 접촉 상태에 따른 발열 분석에 관한 연구
안종곤(Ahn jong-gon),김주태(kim ju-tae),채진우(Chai jin-woo),김충선(Kim choong-sun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
철도차량용 전선 및 단자의 접촉 압력에 따른 발열 특성을 조사 분석 연구 하고자한다. 차량의 전선 단자의 접촉 압력의 변화에 따라 발열 정도가 다르며, 접촉 불량시 접촉 저항 증가로 온도가 급격하게 상승하며 또한 발열이 증가하여 화재 발생의 원인이 된다. 연속적인 미세한 불꽃과 발생음이 발생하고 있으며, 시간의 경과에 따라 869℃ 로 온도가 상승되며, 전기 재해의 위험이 발생하여 승객의 안전에 유해함을 알 수 있다.열화상 카메라를 사용하여 단자부의 온도를 측정함으로써 접촉상태를 확인 할 수 있어 철도차량 예방정비의 효과가 있으며, 단자부의 온도상승을 방지하여 화재를 예방하고 승객의 안전을 확보 할 수 있다. Investigation analysis researches the heat generation quality which follows in contact pressure of the railway car electric line and the terminal and character does. According to change of contact pressure of the electric line terminal the heat generation degree is different, the temperature suddenly with contact defective city contact resistance increase, rises and the heat generation increases and becomes the cause of fire occurrence. The flame which is minute is continuous and occurrence sound will occur, according to lapse of time the temperature will be risen at 869℃, electric disaster danger this will occur and the corpse box there is a possibility which safely of the passenger will know. Uses the deterioration as a matter of camera and measures a terminal bringing up for discussion temperature with will be able to confirm a contact condition to be, there will be an effect of railway car preventive maintenance, will prevent will prevent will be able to secure a terminal bringing up for discussion temperature rise and a fire and the safety of the passenger
안종곤(Jong-Gon Ahn),권석진(Seok-Jin Kwon),김호경(Ho-Kyung Kim),유인동(IN-Dong You) 한국트라이볼로지학회 2012 한국윤활학회지(윤활학회지) Vol.28 No.1
Rolling contact fatigue of an urban railway wheel was analysed during its rolling. A FEM analysis was performed using a 3D modelling of rail and wheel, considering the slope of the rail and nonlinear isotropic and kinematic hardening behavior of the rail and the wheel. The maximum von-Mises stress and contact pressure between the rail and wheel were 656.9 MPa and 1111.4 MPa, respectively, under axial load of 85 kN with friction coefficient of 0. The fatigue initiation life prediction relationships by strain-lifetime (ε-N) and Smith-Watson-Topper method were drawn for the wheel steel as follows: N1 = 7.35 × 10<SUP>6</SUP>×SWT<SUP>3.56</SUP>(ε-N) and and N, = 5.41 × 10-9×(Δε/2)-5.77. The fatigue lifetimes of the wheel due to rolling contact were determined to be infinite by ε-N and SWT methods.
안종곤(Ahn, Jong-Gon),권석진(Kwon, Suk Jin),김호경(Kim, Ho Kyung) 한국도시철도학회 2013 한국도시철도학회논문집 Vol.1 No.2
철도차량을 지지하고, 전동차가 레일을 따라 운행할 수 있도록 발생하는 모든 힘은 차륜과 레일의 경계영역에서의 접촉면(contact patch)에서 마모가 발생한다. 차륜과 레일의 경계영역에서의 마모현상은 철도시스템에서 기본적이면서 복잡한 문제이다. 차륜의 수명은 일반적으로 마모에 의하여 결정된다. 본 연구에서는 twin disc 형태의 시험기를 이용하여 마모 특성 시험을 실시하였으며 슬립율, 접촉온도 등의 변화에 따른 마모 영향인자의 변화를 연구하였다. Wheel and rail wear is a fundamental and complicate problem in railway field. The life of railway is usually limited by wear. The wheel surface is subjected to high normal and tangential contact stress. The removal of material from the surface by wear is function of the sliding and contact stress. In the present paper, the wear characteristic depended on slip rate, contact pressure and temperature are investigated and is used to twin disc tester. The result shows that the wear in wheel-rail interface is remarkably depended on slip rate and contact pressure.
차륜 답면과 레일의 경계영역에서의 마모 특성 (Wear characteristics depended on Wear Index in Wheel-Rail Interface)
안종곤(Jong-Gon Ahn),권석진(Seok-Jin Kwon),손영진(Young-Jin Son),김호경(Ho-Kyung Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Wheel and rail wear is a fundamental and complicate problem in railway field. The life of railway is usually limited by wear. The wheel surface is subjected to high normal and tangential contact stress. The removal of material from the surface by wear is function of the sliding and contact stress. In the present paper, the wear characteristic depended on slip rate, contact pressure and temperature are investigated and is used to twin disc tester. The result shows that the wear in wheel-rail interface is remarkably depended on slip rate and contact pressure.
안종곤 ( Jong Gon Ahn ),유인동 ( In Dong You ),권석진 ( Seok Jin Kwon ),김호경 ( Ho Kyung Kim ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2
Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7MPa and 626MPa, respectively. The uniaxial fatigue limit was 422.5MPa, corresponding 67% of the ultimate tensile strength. The ratio of Te/Oe was 0.63. Fatigue strength coefficient and exponent were 1319.5MPa and 0.339, respectively. Maximum principal and equivalent strain were found to be adequate parameter to predict fatigue lifetime of the steel under multiaixal fatigue condition.
안종곤(Ahn jong-gon),유인동(you in-dong),권석진(kwon suk-jin),손영진(son young-jin),김호경(kim ho-kyung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7 MPa and 626 MPa respectively. The uniaxial fatigue limit was 422.5 MPa corresponding 67% of the ultimate tensile strength. The ratio of was 0.63. Fatigue strength coefficient and exponent were 1319.5 MPa and 0.339 respectively. Maximum principal and equivalent strain were found to be adequate parameter to predict fatigue lifetime of the steel under multiaixal fatigue condition.
안종곤(Ahn, Jong Gon),유인동(You, In Dong),권석진(Kwon, Suk Jin),김호경(Kim, Ho Kyung) 한국도시철도학회 2013 한국도시철도학회논문집 Vol.1 No.1
본 연구는 도시철도에서 운영하고 있는 차량의 차륜재에서 일축 시험편과 이축 비틀림 시험편을 피로 및 인장 시험을 수행하였다. 이를 통하여 다축응력상태에서의 피로수명을 평가하는데 필요한 재료 물성치를 평가하였다. 인장실험 결과 최대 인장강도 및 항복강도는 각각 1027.7 MPa , 626.7 MPa이며 연실율은 40.4%로 나타나 인장 및 항복강도 측면에서 고속 차륜재와 유사하며 연신율은 약 2.5배 우수한 것으로 나타났다. 일축 피로 한도는 422.5 MPa로 인장강도 대비 67%로 나타났으며 이축 비틀림 피로한도 대비 일축 피로한도의 비 τe /σe는 0.63으로 통상적인 연성재에 해당하는 값인 0.6에 근접한다. Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7 MPa and 626 MPa. respectively. The uniaxial fatigue limit was 422.5 MPa, corresponding 67% of the ultimate tensile strength. The ratio of was 0.63. Fatigue strength coefficient and exponent were 1319.5 MPa and 0.339, respectively. Maximum principal and equivalent strain were found to be adequate parameter to predict fatigue lifetime of the steel under multiaixal condition.
김문기(Moon-Ki Kim),안종곤(Jong-Gon Ahn),김성권(Sung-Kwon Kim),권석진(Seok-Jin Kwon),이희성(Hi Sung Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Wheel and rail wear is a fundamental and complicate problem in railway field. The life of railway is usually limited by wear. The wheel surface is subjected to high normal and tangential contact stress. The removal of material from the surface by wear is function of the sliding and contact stress. In the present paper the wear characteristic depended on slip rate contact pressure and temperature are investigated and is used to twin disc tester. The result shows that the wear in wheel-rail interface is remarkably depended on slip rate and contact pressure.