DANSK DSF/ISO/FDIS 20138-2 PDF

The present document specifies the methodologies for calculation of braking performance for railway rolling stock and is applicable to all countries. The present document describes the general algorithms/formulae using instantaneous value inputs to perform calculations of brake equipment and braking performance in terms of stopping/slowing distances, power and energy for all types of rolling stock either as vehicles or units with respect to the braking distance. The calculations can be used at any stage of the assessment process (design, manufacture, testing, verification, investigation etc.) of railway rolling stock. This document does not set out specific acceptance criteria (pass/fail). The present document is not intended to be used as a design guide for selection of brake systems and does not specify performance requirements. This document does not provide a method to calculate the extension of stopping distances when the level of demanded adhesion exceeds the available adhesion (wheel slide activity). The present document contains examples of the calculation of brake forces for different brake equipment types and calculation of stopping distance relevant to vehicles or units. The methodology of step by step calculation is based on numerical time integration.