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- W2018002758 abstract "The objective of this study is to examine the geometric description of the spiral sections of railway track systems in order to correctly define the relationship between the geometry of the right and left rails. The geometry of the space curves that define the rails are expressed in terms of the geometry of the space curve that defines the track center curve. Industry inputs such as the horizontal curvature, grade, and super-elevation are used to define the track centerline space curve in terms of Euler angles. The analysis presented in this study shows that, in the general case of a spiral, the profile frames of the right and left rails that have zero yaw angle with respect to the track frame have different orientations. As a consequence, the longitudinal tangential creep forces acting on the right and left wheels, in the case of zero yaw angle, are not in the same direction. Nonetheless, the orientation difference between the profile frames of the right and left rails can be defined in terms of a single pitch angle. In the case of small bank angle that defines the super-elevation of the track, one can show that this angle directly contributes to the track elevation. The results obtained in this study also show that the right and left rail longitudinal tangents can be parallel only in the case of a constant horizontal curvature. Since the spiral is used to connect track segments with different curvatures, the horizontal curvature can not be assumed constant, and as a consequence, the right and left rail longitudinal tangents can not be considered parallel in the spiral region. Numerical examples that demonstrate the effect of the errors that result from the assumption that the right and left rail in the spiral sections have the same geometry are presented. The numerical results obtained show that these errors can have a significant effect on the quality of the predicted creep contact forces." @default.
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- W2018002758 date "2009-01-01" @default.
- W2018002758 modified "2023-10-16" @default.
- W2018002758 title "Accurate Geometric Description of Spirals in Railroad Vehicle Dynamic Simulations" @default.
- W2018002758 doi "https://doi.org/10.1115/detc2009-86237" @default.
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