High frequency modelling and validation of railway dampers

Resumen:
This paper presents and validates an appropriate physical damper model to predict the dynamic behaviour of a railway damper for frequencies of up to 200 Hz. The model is computationally efficient and, therefore, appropriate for implementation in NVH-CAE models used to study the transmission of vibration paths to the train body. The model parameters are related to the physical characteristics of the damper (volume of the chambers, piston rod sections, characteristics of the valves, etc.). However, it is shown that in the absence of internal constructive information, which is most often the case, the model parameters can be fitted from a few tests carried out at low frequency (0-20 Hz), based on its theoretical background.