Analysis of Vehicle Dynamic Performance under MCAT Excitation

In order to validate the running safety on track of railway vehicle, a numerical analysis is performed with a multi-body vehicle dynamics model built. Follow the vehicle-track interaction (VTI) evaluation declared in north America standard declared by Federal Railway Association (FRA), a Minimally Compliant Analytical Track (MCAT) worthiness analysis is employed. In this investigation, the analytical track geometry irregularities which consist of surface, vertical and short warp are defined. Then the running performances concerning the derailment safety of the vehicle is discussed by evaluating the wheel unloading and derailment coefficients. Vibration acceleration of the carbody is also monitored to evaluate the ride comfort. By changing the track irregularities MCAT, the impact of track wavelength, gauge and cant deficiency on the dynamic performance of the vehicle can be assed.