Encounter period Te experienced by a ship at speed V making heading μ relative to waves of period T_w - a governing parameter for resonant rolling.
Formula
$$ \omega_e = \omega_w - \frac{\omega_w^2 V \cos\mu}{g} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\omega_w$ | Wave angular frequency | rad/s | spectrum |
| $V$ | Ship speed | m/s | log |
| $\mu$ | Heading relative to waves | rad | nav plan |
Sources
- Lloyd A.R.J.M. - Seakeeping (1989).