Analysis Of Braking Performance For The
Definition Of Emergency Braking Intervention In
ATP Systems
Author(s)
M. Malvezzi, F. Bartolini, M. Rinchi & A. Rindi
Abstract
A traffic management system is generally based on a set of supervision curves
relating the permitted velocity of the train to the running distance, in order to
ensure the respect of speed restrictions on the line by intervention of an
emergency braking in case of train velocity exceeding the permitted one. The
basic braking model defines a deceleration profile, which represents the train
nominal braking performance, used to determine the stopping distance and to
compare it with the available distance. This deceleration profile value has to be
reduced using properly defined safety coefficients.
The paper describes the method that allows one to calculate the safety
coefficient as a function of the safety target (in terms of probability of failure).
The method is based on the braking performance probability distribution
estimation, expressed as the ratio between the real and the nominal deceleration.
This study permits one to evaluate the probability that the real deceleration is
smaller than the one used in the basic braking model and then that the real
stopping distance is longer than the one calculated by the braking model. This
model can then be used to tune the value of the safety margin in order to obtain a
certain probability of system failure.
The numerical procedure used to simulate the braking performance is based
on the Monte Carlo method, which is a method for iteratively evaluating a
deterministic model using sets of random numbers as inputs. This method is
often used when the model is complex, nonlinear, or involves several
parameters.
Keywords: deceleration distribution, Monte Carlo, safety margins.
Keywords
deceleration distribution, Monte Carlo, safety margins.
Related Book
Other papers in this volume
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