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Rigid Car-Body Modal Answers


  Frequency Damping  
Mode name [Hz] [%] Description:
Lower sway 0.61 11.5 Car-body lateral and car-body roll moves in phase.
Upper sway 1.78 34.7 Car-body lateral and car-body roll moves out of phase.
Body bounce 1.10 16.9 The car-body moves vertically.
Body pitch 1.36 23.7 The car-body pitches.
Body yaw 1.31 43.7 The car-body moves mostly in yaw.
1:st bogie kinematic 4.53 20.5 The two bogies are approximately in phase.
2:d bogie kinematic 4.57 21.6 The two bogies are approximately out of phase.
Bogie longitudinal vibration 9.59 27.7 The two bogies vibrates in longitudinal direction out of phase.

Sometimes it is not easy to distinguish between the different vibration modes in a railway vehicle, different modes can interfere with each other.