Using type II cadioids in railway track design
https://doi.org/10.52170/1815-9265_2025_74_5
Abstract
In order to increase the effectiveness of railroads, we, among other things, have to increase the average running speed of trains and create special high-speed railways. Higher speeds achieved without special measures by themselves cause significant rise in loads experienced by railways and rolling stock and put transportation safety at risk. For a long time, there have been advancements made in the construction of trains to accommodate higher speeds, in infrastructure – to accommodate higher power requirements of new trains, but the fundamentals of a railway design have remained unchanged. Geometry of a railroad in a large part defines the dynamics of a passing train, but the design concepts can be improved to provide improved safety and ride smoothness while decreasing the forces acting on a train and a track, which is especially beneficial for high-speed railways.
In recent years there have been active discussions and research in the field of biclothoid curves, which suggest the need to increase ride smoothness by means of designing smoother curves. Having said that, the biclothoidal geometry itself isn’t sufficient because it doesn’t get rid of the piecewise-linear nature of clothoids curvature-wise, which causes problems in the first place.
This article considers a potential use of type II cadioids – curves with a smooth nonlinear curvature function – in high-speed railway design. Mathematical description of these curves and their characteristics is provided and compared to standard and biclothoidal designs. Results of simulations are used to compare the effects of different geometries on train dynamics. Plots and numerical data are provided. Conclusions about the potential advantages of type II cadidoids are drawn.
About the Authors
A. V. Chonka
Ural State University of Railway Transport
Russian Federation
Russian Federation
Artem V. Chonka – Postgraduate
Yekaterinburg
I. L. Parakhnenko
Ural State University of Railway Transport
Russian Federation
Russian Federation
Inna L. Parakhnenko – Candidate of Engineering, the Head of the Track and Railway Construction Department
Yekaterinburg
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Review
For citations:
Chonka A.V., Parakhnenko I.L. Using type II cadioids in railway track design. Bulletin of Siberian State University of Transport. 2025;(2):5-15. (In Russ.) https://doi.org/10.52170/1815-9265_2025_74_5
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