Computer Controlled Capsizing Tests Using Tailored Wave Sequences

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Abstract
This paper presents a new kind of computer controlled sea-keeping test procedure for investigating large roll motions and capsizing behavior of ship models. In cooperation with the Hamburg Ship Model Basin (HSVA) our research group has carried out computer controlled capsizing tests in steep transient wave groups for two different types of ship models which show typically two different modes of rolling. The parameters of the model seas – transient wave sequences consisting of random seas or regular wave trains with an embedded deterministic high transient wave – are systematically varied to investigate the ship model response with regard to metacentric height, model velocity, and course angle for each of both ship types. The wave elevation at the position of the ship model at any position in time and space is calculated by a semi-empirical method (and controlled by registrations during model tests) in order to relate wave excitation to the resulting roll motion.

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