| Intense motions of ships in waves depress ship's working efficiency, damage ship's structures and even cause shipwrecks. Therefore, it is definitely significant and meaningful to realize thoroughly the characteristics and principles of ship's motions in waves because correct realization is able to support people designing ships with better seakeeping performance and increasing ship's safety performance.In this paper, HydroStar, a version of hydrodynamic software from Bureau Veritas, is applied to computing different kinds of ship's heave pitch and roll motion in waves. Main work includes:1) Computation of Wigley I model's heave and pitch motion in head sea, comparison of results arising from HydroStar, STF strip theory and experiments made by the towing tank of Delft University of Technology;2) Prediction of the USS Enterprise's seakeeping performance, which is verified by following analysis. Investigation on reliability of the means applied in this paper to evaluate seakeeping performance of aircraft carriers;3) Preliminary research of numerical resonance occurring in the process of calculating a trimaran's seakeeping performance. An effectual method to solve the numerical resonance. Validation of the new method's feasibility via comparison of results from classical computational method, new computational method and experiments;4) Heave and pitch RAO of the trimaran in head sea and roll RAO in beam sea at three speeds. Study on effect of outriggers' position on the trimaran's heave pitch and roll motion in waves.
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