Calculation of freight train derailment process caused by rail bucking of CWR

In order to study freight train derailment law caused by the rail bucking of CWR, the spatial vibration calculation model for the freight train-track system under the rail bucking of CWR was established by taking the single waveform rail bucking as an example. According to the random energy analysis method of train derailment, a calculation method for the whole derailment process of freight train caused by the rail bucking of CWR was proposed. The train derailment processes were calculated and the effects of the rail bucking condition on the wheel-rail geometric contact state and relative position were analyzed. Results show that the derailment coefficient and wheel load reduction ratio increase with the increase of bucking amplitude when the wavelength of rail bucking is fixed. Meanwhile, the derailment coefficient and wheel load reduction ratio increase with the decrease of bucking wavelength when the bucking amplitude is fixed. However, the derailment coefficient and wheel load reduction ratio lack control function for the derailment caused by the rail bucking. The lateral relative displacement between bogie and rail increase with the decrease of bucking wavelength or the increase of bucking amplitude of the rail, and the maximum relative displacement of the study case is 72.6 mm. The above results can provide the basic data for the development of a detection device with a real-time derailment detection function. © 2020, Central South University Press. All rights reserved.