Rigorous vehicle soil track simulation of high speed rail through optimization based model order reduction

This paper aims to develop a time domain analysis method capable of accurately simulating the vehiclesoil-track interaction phenomenon in a computationally rigorous manner. The proposed method takes full account of wave propagation effects in the subsoil half-space through the development of a systematic frequency dependent lumped parameter assembly. A robust multi-objective optimization methodology is proposed for the calibration of the developed lumped parameter assembly targeting the dynamic behavior, global stability and passivity of the track-subsoil system while maintaining the broad applicability of the method by any commercial FEM software. A case study of a ballasted track on a soft clay profile is presented in order to investigate the efficiency of the proposed methodology. Finally, the monitored response of a modern ballastless high speed track located in mainland Europe is used for further verification. Results demonstrate the efficiency, accuracy and applicability of the proposed methodology