Estimation of lateral and cross alignment in a railway track based on vehicle dynamics measurements

The paper presents three different approaches to the estimation of the lateral and cross-level track irregularities, one defined in the frequency domain and two in the time domain. For each method, an assessment is performed based on numerical experiments in which virtual measurements from vehicle-mounted sensors are obtained by means of numerical simulations performed using a multi-body model of a railway vehicle. For the method defined in the frequency domain, a first application to line measurements is presented.