Vostroukhov A.V., Metrikine A.V., Vrouwenvelder A.C.W.M., Merkulov V.I., Misevich V.N., Utkin G.A.


Remote detection of derailment of a wagon of a fright train: theory and experiment


Archive of Applied Mechanics 73(1-2), 75-78, 2003



Summary. This paper discusses the possibility to detect derailment of a train’s wagon by measuring vibrations of the rails under the locomotive. Both theoretical and experimental studies are carried out followed by comparison of their results. For theoretical modeling of the railway track, a Timoshenko beam on discrete, equidistantly spaced supports is used. The steady-state response of the beam to a load that either uniformly moves along the beam or uniformly “jumps” over the supports is investigated in a point, which moves at a fixed distance from the load. The load that moves along the beam is used to model the “normal motion” of a train’s wheelset, whereas the “jumping” load is employed to model the action of a derailed wheelset. It is shown that the effect of the derailed wheelset contains in amplification of the rail’s response in the frequency band that surrounds the natural frequency of the sleeper’s vibrations. This theoretical prediction is confirmed experimentally. A method is proposed of processing the measured data that allows for stable detection of the derailment. A maximum distance between the locomotive and the derailed wagon is estimated, at which the detection is possible.