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민동주(Dong-Ju Min),정명락(Myung-Rag Jung),박성민(Sung-Min Park),김문영(Moon-Young Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The purpose of this study is to investigate the influence of moving mass on the vibration characteristics and the dynamic response of the simply supported beam. The three types of the moving mass (moving load, unsprung mass, and sprung mass) are applied to the vehicle-bridge interaction analysis. And the numerical analyses are then conducted to evaluate the effect of the unsprung mass and the spring and damper of the sprung mass on natural frequencies and dynamic responses of the simple beam. Particularly, in the case of the sprung mass, how the natural frequency of the interaction system is varied is explored depending on the position of the moving mass and the frequency ratio of the moving mass and the beam. Finally the parametric study on the resonance phenomena is done with changing mass, spring and damper parameters through the time history simulation.
이동질량을 고려한 단순지지된 교량의 진동수 및 공진현상 분석
민동주(Dong-Ju Min),정명락(Myung-Rag Jung),박성민(Sung-Min Park),김문영(Moon-Young Kim) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.1
The purpose of this study is to investigate the influence of moving mass on the vibration characteristics and the dynamic response of the simply supported beam. The three types of the moving mass(moving load, unsprung mass, and sprung mass) are applied to the vehicle-bridge interaction analysis. The numerical analyses are then conducted to evaluate the effect of the mass, spring and damper properties of the moving mass on natural frequencies and dynamic responses of the simply supported beam. Particularly, in the case of the sprung mass, variations of the natural frequency of simply supported beam are explored depending on the position of the moving mass and the frequency ratio of the moving mass and the beam. Finally the parametric studies on the resonance phenomena are performed with changing mass, spring and damper parameters through the dynamic interaction analyses.
레일-윤축 사이의 궤도력을 고려한 열차-교량 동적상호작용해석
민동주(Dong-Ju Min),곽종원(Jong-Won Kwark),김문영(Moon-Young Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
열차-교량 동적상호작용해석에 있어 궤도구조의 상호작용력을 고려하는 방법은 크게 3가지로 분류할 수 있다. 첫번째로 레일-윤축 사이를 압축스프링으로 이상화하여 스프링력의 상호작용을 고려하는 해석법이며, 두번째로 바퀴-레일 사이가 항상 접촉하고 있다는 가정하에 적용되는 모델로 바퀴와 그 지점의 레일의 변위를 일치시키는 해석법이다. 마지막으로 레일-윤축 사이의 contact mechanism을 보다 사실적으로 고려하는 해석법이다. 즉, 바퀴-레일 사이의 접촉면적, 압축변형을 산정하여 압축변형이 발생할 경우 압축스프링과 유사한 개념으로 가정하고, 바퀴-레일 사이의 상대변위가 음인 경우는 분리가 발생하는 것을 허용하며, 횡방향으로 플랜지 접촉력을 고려하는 비선형 반복해석법이다. 본 논문에서는 언급한 해석법을 기술하고, 해석예를 통해 해석결과를 비교 분석한다. There are representative 3 types for considering interaction forces between wheel-rail in trainbridge interaction analysis. One is a spring model that idealizes interaction forces between wheel-rail as a spring. And the other one is a non-jump model that assumed coincidence of wheel and rail responses at the same position. The last one is a contact model that considers contact mechanism between wheel-rail to analyze the train-bridge interaction more realistically. In this study, above mentioned 3 types models are described briefly, and an accurate contact model including jump phenomena and flange contact motions is then presented and analyzed. Lastly, the results for 3 types are compared under the same condition.