Browsing by Author "Birhan, Abebaw"

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    Wheel Rail Interaction Modeling on Rail Vehicle System Lateral Dynamics
    (2014-09) Birhan, Abebaw; Zewdu, Abdi (Mr.)
    The long history of railway engineering provides many practical examples of dynamic problems which are unique to railway vehicles. One of the railway vehicle's dynamic problems is the lateral dynamic which is mainly arising from wheel rail contact condition. In the early time, to analyze and formulate such kinds of railway vehicle dynamics scientists had been using different experimental methods such as roller rigs and roller coasters. Even though such experimental methods are most efficient and error free, they are very costly and need some time. But now a day there are different computer packages used to study and simulate the dynamic behavior of a railway vehicle (ADAMS/RAIL, SIMPAKC and Vampire). These computational packages are very efficient in both cost and time but they are not more flexible and require indepth knowledge to run them. So this paper tried to make the computational tool more flexible and easy to use with basic computer knowledge In the work presented, mathematical model and computational tool used for the dynamic simulation of railway vehicle wheelset systems was developed using multibody systems formulations. The model based on the multibody techniques developed by Shabana. With respect to other exciting methodologies the proposed one make use of a combined frame of references that permit the use of independent coordinates, without the possibility to have singularity configurations depending on the rotation sequence. Lagrangian Equation of motions such as virtual work and kinetic and potential energy are used to develop the equation of motion. Finally a MATLAB program is developed to analyze the dynamic behavior of the wheelset at different velocities on a straight track. The program was designed to considering the flexibility of different configuration of railway vehicles. The model used was applied to make a simulation for single wheelset. The analysis were made for different velocities, lower than the critical in which the vehicle responded in stable form, and higher than the critical at which the instability of the vehicle was studied. The obtained results of the dynamic response for a defined track composed of tangent segment is analyzed and compared with one published paper.