A Computer Tool For Automatic Braking
Distance Calculation
Author(s)
C. Sicre, A. P. Cucala, A. Fernández & L. Cano
Abstract
This paper presents a new algorithm and a procedure for the efficient and
accurate calculation of braking distances satisfying current safety Standards. One
of these Standards is applied in ADIF (Spanish Railway Infrastructure
Administrator), for instance, in the design of signalling systems, to locate signals
and balises. Following the Standard, braking distance tables depend on the
average gradient along that distance and the speed reduction. In practice, an
initial slope is calculated over a forecasted braking distance along the railway
track, so that if the corresponding braking distance given by the Standard highly
differs from the initial one, it will be necessary to recalculate the average
gradient and apply the Standard again. The manual application of this process
may end up overestimating braking distances unnecessarily (as the Standard
itself includes safety coefficients), falling into additional signalling costs and
reducing the line capacity. This paper presents an iterative calculation procedure
to adjust as much as possible the distance required by the Standard, so that the
average gradient introduced into the Standard corresponds precisely with the
braking distance where the average gradient has been computed. Furthermore,
the algorithm improves the accuracy of the average gradient calculation,
considering the slope transition curves instead of sharp slope vertices. The
proposed algorithm has been implemented in a computer tool for its use in
railway lines operated by ADIF, according to the braking distance current
Standard (N.T.C.020.95). This tool incorporates a railways net model that allows
the user to introduce a final braking point, a speed reduction, and provides
automatically the kilometric line point where the brake should start. In addition,
this tool provides a systematic procedure to obtain braking distances in the
different technical departments of ADIF. This paper compares, in real cases, the
non-assisted previous procedure with the application of the proposed one,
showing the refined braking distances.
Keywords: braking distance, N.T.C.020.95, KV, average gradient, signalization.
Keywords
braking distance, N.T.C.020.95, KV, average gradient, signalization.
Related Book
Other papers in this volume
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