Transcript The Measures against Train Derailment by the Aerodynamic Force

The Measures against Train Derailment
by the Aerodynamic Force
Tatsunori TANAKA
The University of Tokyo
Outline
1.Introduction
2.Method
3.Result
4.Conclusion
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1.Introduction
• Amarube bridge accident
• The regulation about train operation became strict.
• Each railway company often has to stop trains
when the wind blow strongly.
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2. Method
Elements we consider are :
• Train speed
• Putting a fence along the
track
• (Geometry of the train)
• (Train weight)
Force act on the train
•Gravity
•Inertia force
•Aerodynamic force
Numerical Analysis Model
•Spring model
Obtain limit wind speed
not to derail the train
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3.Result
• Effect of train speed
•Effect of putting a fence
Wind velocity (m/s)
wind velocity (m/s)
50
40
30
20
Normal
Putting a fence
10
0
40
Wind angle (deg)
Fig 1: The relationship between train speed
and limit wind velocity
50
60
70
80
90
100
wind angle (deg)
Fig 2 : effect of putting a fence
110
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4. Conclusion
• When a train is static, the limit wind velocity is the largest.
• As the train speeds up, the limit wind velocity becomes
small.
• When we put a 1m height fence along the track, the limit
wind velocity increases by 5 or 7 m/s.
• Putting a fence along the track is more effective from
stopping operation of trains.
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