Collision Energy Absorption (DNV)
Bow-to-side collision kinetic energy at impact: E = ½ · M_eff · V² between two ships of different size.
Effective mass (reduced + added)
31,590t
Collision energy
0.3MJ
Formula, assumptions, and limits
$$E = \tfrac{1}{2} M_\text{eff} V_\text{rel}^2, \quad M_\text{eff} = \frac{M_1^* \cdot M_2^*}{M_1^* + M_2^*}$$
M* = displacement × (1 + added-mass factor). Striking ship added mass ≈ 0.10 (bow motion); struck ship ≈ 0.40 (sway + yaw). Side-shell absorption depends on structural grillage and bulb shape. DNV-RP-C204 method.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $M_1^*, M_2^*$ | Effective (added) masses | t | displacement + added mass |
| $V_\text{rel}$ | Relative speed at impact | m/s | operating condition |
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