Analytical Model of Track Dynamic Responce to Running Load
Shigeru MIURA
Large dynamic forces act between wheel and rail due to rail surface irregularities at
rail welded parts and/or wheel flats. With regard to such dynamic forces and track
responses caused thereby, various models have been so far proposed, with which a lot of
findings have been achieved. Considering the current status of an increasing train speed
however, it is necessary for the design of track and vehicle components to make more
precise than ever prediction of those models. In fact, it is very important to understand
dynamic track and vehicle behaviour due to such dynamic forces for the porpose of
estimating various components of any kinds of track structures. The author proposed an
analytical track dynamic model in which rail is considered to have a distributed mass
and supported discretely at sleepers, which model can cover the dynamic track and vehicle
behaviour in the high frequency range.