An examination of the influence of the damping effects on the ship rolling motion in regular beam seas has been made.
The assumed damping includes both the linear and quadratic contributions, where, in particular, for the linear term a given dependence on heeling angle is assumed.
An approximate analytical solution in the resonance region was determined by a perturbation method and compared with a numerical solution. The results showed that the maximum rolling amplitude attainable for a given excitation is markedly affected by the angle-dependent part which was introduced in the linear damping.
