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DEVELOPMENT OF A BRAKING MODEL FOR SPEED SUPERVISION SYSTEMS

The monitoring curves of a speed control system are generally implemented through a model describing the braking performances of trains in terms of initial delay and braking deceleration. The paper presents a braking model developed to be employed in a new ATP system for the Italian railways. Such model, based on the braked weight percentage, was derived from the UIC regulation so as to be applicable to all kind of trains and braking systems. Taking also into account the variability of the major parameters affecting the braking performances of trains, a probabilistic analysis is presented with the purpose of determining the proper safety margins to be applied to the basic braking model.