... roll angle parametric rolling passenger ship ship radiation force hydrodynamic memory effect beam wind good agreement resonance coefficient numerical model spectrum THE 30th AMERICAN TOWING TANK CONFERENCE WEST BETHESDA, MARYLAND, OCTOBER 2017 Effect of Hydrodynamic Memory on Ship...

... of gyration 0.8434 ±0.0024 m (±0.28 %). The roll period in calm water was independent of the Froude number (Fr) and initial roll angle (a). At Fr = 0, 0.15, 0.22, the average roll period was 2.2298 ±0.0040 s (±0.18 %) for 76 runs, all Fr, and all initial roll angles. The initial roll angle variation was 3...

..., and the forces/ moments in six degrees of freedom at varying forward velocities, yaw angles, and initial roll angles. Future analysis of roll (and roll coupled) hydrodynamic coefficients will be investigated by least square approximation using over-determinant matrix manipulation with comparisons to coefficient...

... on the initial roll angle is easy to obtain. The emphasis in this paper is a 'frequency domain' analysis of the results with equivalent linear damping as the primary target. The advantage of the simple decay test is that it allows for analysis in both the frequency and time domains. A study of the results...