A Study on the Dynamic Characteristics of longitudinal direction according to the Torque Control of a Train

초록

A train transporting passenger and freight has been evolved the faster and safer all around world. A train should have various preferable performances such as running stability, safety, traction, braking, vibration of car body (ride comfort), HVAC (Heat, ventilation and air conditioner) and current collection etc, not only to produce comfortable journey for passenger but also to secure running stability and safety due to mass transits and rapid transits. The dynamic performance of a train is divided into the running stability, the running safety and the ride comport. In generally, the running stability and safety is estimated by vertical and lateral acceleration. However, the ride comfort of a train should be assessed by not only vertical and lateral acceleration but also longitudinal acceleration, because the jerk, occurred by variation of longitudinal acceleration when a train starts or brakes suddenly, effects on the ride comfort of passenger. The toque control for a train (traction and brake force) is inquired both to secure favorable ride comfort of passenger and to guarantee the short accelerating and braking distance interfering each other. To control the torque an analysis of the longitudinal dynamic characteristic is required. In general, the study of the dynamic characteristic of a train is divided into the analytical method and the experimental method, and it has been accomplished. Now a day, most analysis tool, utilizing to analyze dynamic characteristic of a train, are allowed to interpret as constant speed condition only, and the dynamic characteristic of longitudinal direction by torque control is validated by experimental method only. In this paper, the dynamic characteristic of longitudinal direction occurred under toque control condition of a train has been studied by the analytical method and the experimental method, and these results have been analyzed by comparing each other. Also, influences upon dynamic behaviors of a train while operating in the case of occurrence the fault at the traction motor and the brake system determining toque values have been investigated.