4. Glossary
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...
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Glossary
Nomenclature
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