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Dynamics & vibration
When a train catches its own waves
Critical speed on soft ground · narrated
- Duration
- 1:30
- Year
- 2026
The case
On firm ground, a train at 200 km/h sends barely 8 mm/s of vibration down to a buried gas pipeline. On soft clay, where surface waves travel at only 240 km/h, the picture changes: 42 mm/s at 120 km/h and 100 mm/s at 200 km/h. Stiffening the soil with columns doubles the wave speed and cuts vibration by 79 % at 200 km/h.
Topics
- Ground-borne vibration
- Wave propagation
- Narrated explainer
Basis. Generic synthetic case built for this piece. No client data. Not a design verification.
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