Parametric Roll Susceptibility
Screening criterion - parametric roll likely if wave length λ ≈ L_pp AND encounter period 2·T_φ (twice natural roll period).
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Wave length | m | |
| LBP | m | |
| Natural roll period | s | |
| Wave encounter period | s |
Source: IMO MSC.1/Circ.1228; IMO Second-Generation IS criteria
In short
Screening criterion - parametric roll likely if wave length \u03bb \u2248 L_pp AND encounter period 2\u00b7T_\u03c6 (twice natural roll period).