Validation of the train energy and dynamics simulator (TEDS).
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Validation of the train energy and dynamics simulator (TEDS).

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    • Abstract:
      FRA has developed Train Energy and Dynamics Simulator (TEDS) based upon a longitudinal train dynamics and operations

      simulation model which allows users to conduct safety and risk evaluations, incident investigations, studies of train operations,

      ride quality evaluations, and evaluations of current equipment and new equipment designs.

      This document describes how TEDS modelling software predictions were validated with publicly available data in order to

      establish a sufficiently high level of confidence for users, which will enable them to conduct studies and investigations with

      TEDS. This report describes the approach to validating TEDS and the associated criteria that were adopted for this purpose, and it

      discusses validating the model at the train level as well as validating simulations of the braking systems (both pneumatic and

      electronically controlled pneumatic (ECP)) and the coupling systems (both draft gears and cushioning units). Train level

      validation was accomplished using available velocity profiles, coupler forces, brake pipe and brake cylinder pressures and

      stopping distance data from for well documented published and publicly available sources.

      After the validation process concluded, it was evident that TEDS is a high fidelity model that realistically predicts longitudinal

      train behavior under a variety of operating conditions, including acceleration, braking, steady state running, hilly terrain operation,

      and certain emergency conditions. Further, it demonstrated that TEDS’ predictions are realistic for both gross train dynamics,

      which is measured by parameters such as position, velocity, and stopping distance, as well as inter-car dynamics, which is

      measured by parameters such as coupler forces.

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