Glossary
Railway Dynamics and Wheel-Rail Contact. Simulations and Testing for Running Dynamics Behaviour Assessment

Bogie yaw resistance

Torque around the vertical axis between bogie and vehicle body required to rotate a bogie while supporting a vehicle body.

Critical speed

Speed above which a vehicle is running instable (sinusoidal motion of the wheelset along the track) occurs.

Flange climbing

Gradual wheel climb up on the gauge comer of the rail, leading to a risk of derailment.

Natural frequency (resonance frequency)

Frequency at which a mode of vibration for a mass-spring system occurs.

Non-compensated acceleration (nca)

The lateral acceleration acting on vehicle when travelling through curves. It depends on the running speed and the curve...