Optimisation de la granulométrie du ballast

( , ) f⃗ j→i ‖f⃗ j→i − (f⃗ j→i ⋅ ⃗ ) ⃗ ‖ ≤ |f⃗ j→i ⋅ ⃗ | ⃗ = 0.8 m i dv⃗ i dt = m i g⃗⃗ +∑f⃗ j→i j J i dω⃗⃗⃗ i dt + ω⃗⃗⃗ i × (J i ω⃗⃗⃗ i ) = ∑ℳ⃗⃗⃗⃗ j→i j m i J i ⃗ = ( , , )/ ⃗ = ( , , ) ω⃗⃗⃗ i = 9,81 m/s² {f⃗ j→i , ℳ⃗⃗⃗⃗ j→i } = 0,5 Δ = 2 × 10 −4 s