Simulation of Longitudinal Train Dynamics: Case Studies Using the Train Energy and Dynamics Simulator (TEDS)

Abstract

Longitudinal dynamics influence several measures of train performance, including schedules and energy efficiency, stopping distances, run-in/run-out forces, etc. Therefore, an effective set of tools for studying longitudinal dynamics is essential to improving the safety and performance of train operations. Train Energy and Dynamics Simulator (TEDS) is a state-of-the-art software program designed and developed by the Federal Railroad Administration (FRA), for studying and simulating train safety and performance, and can be used for modeling train performance under a wide variety of equipment, track, and operating configurations [1]. Several case studies and real-world applications of TEDS, including the investigation of multiple train make-up and train handling related derailments, a study of train stopping distances, evaluations of the safety benefits of Electronically Controlled Pneumatic (ECP) brakes, Distributed Power operations, and a study of alternate train handling methodologies are described in this paper. These studies demonstrate the effectiveness of using the appropriate simulation tools to quantify and enhance a better understanding of train dynamics, and the resultant safety benefits.

Dynamic indicators influencing design solution for modernization of the freight rolling stock

“…In trains the longitudinal forces sometimes reach a value exceeding the strength of the frame of some wagon designs. Studies have shown that the large values of impact and tractive forces are due mainly to the sudden starting of the train; the in draught of a partially compressed train, especially with a fully uncompressed tail end having wagons with brakes not released; and braking by a stop-crane in the train tail end at a low speed and a compressed train at the beginning of braking [15][16][17][18].…”