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Dynamics of Track/Wheel Systems on High-Speed Vehicles
Isamu Kato,Yoshiaki Terumichi,Masahito Adachi,Kiyoshi Sogabe 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.1S
For high speed railway vehicles, we consider a vibration of flexible track/wheel system It is very Important to deal With the complex phenomena of high-speed vehicles that can be occurred<br/> In the vertical vibration of the system From a viewpoint of multibody dynamics, this kind of problem needs accurate analysis because the system Includes mutual dynamic behaviors of rigid body and flexible body The simulation technique for the complex problems is also discussed We consider the high-speed translation, rail elasticity, elastic supports under the rail and contact rigidity Eigen value analysis is also completed to verify the mechanism of the coupled vertical vibration of the system<br/>
Numerical analysis for coupled train considering 3D wheel/rail contact geometry
Natsumi Nakano,Yoshiaki Terumichi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
The purpose of this study is to propose a coupled train model with a multibody system considering three-dimensional wheel/rail contactgeometry and to assess the safety of high-speed railway vehicles. Railway vehicles are becoming lighter and are running at increasedspeeds, so it is necessary to discuss their safety when subjected to a crosswind. In this paper, we use the proposed model in a situationpresupposing strong crosswinds in order to analyze the behavior of coupled trains under this condition. We discuss the modeling andformulation of a coupled train as well as wheel unloading ratios. Our results show that vibration of a car body is largest in the wheelunloading ratios of the car body when the frequency of the car body is close to the second-mode natural frequency of the vehicle system.
Study of rocking motion of rigid body with slide contact
Keisuke Nozaki,Yoshiaki Terumichi,Kazuhiko Nishimura,Kiyoshi Sogabe 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
The purpose of this study is to formulate the motion of a rigid body with unilateral contact problems by applying techniques of multibody dynamics and to analyze the issue of rocking condition of rigid bodies with slide contact. In To investigate rocking motion with slide contact, we formulate for dynamics of a simple rigid body system with a unilateral contact model. Judgment for the occurrence of contact between a rigid body and a base is applied. The planar motion of a rigid body system having a simple shape and both with and without slide cases is assumed. Using constraint conditions for the contact as algebraic equations, the rocking motion of the rigid body, including slide and frictional force, is analyzed. The differential algebraic equation is solved by the augmented method with Lagrange multipliers, using generalized coordinates and independent variables that describe the contact points. The influence of the frequency and amplitude of disturbance given to the base is discussed.