Sensitivity analysis of the seakeeping behavior of trimaran ships
Kurultay, Aziz Alper
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The dynamic response of the ship while operating in different sea conditions is one of the design parameters of a hull form. The objective of this thesis is to analyze the seakeeping response of trimaran hulls. A three-dimensional Rankine source panel method is used to achieve that. Seakeeping response characteristics of a typical trimaran with a variable separation ratio (the ratio of the lateral distance between center hull and side hull to the length of the ship) and with different longitudinal positions of the side hulls are analyzed. Heave and pitch motion response amplitude operators are evaluated for bow, bow quartering, and beam waves in irregular seas at various ship forward speeds. The corresponding heave and pitch responses were calculated by applying the Bretschneider spectral formulation. Seakeeping behaviors of the generic trimaran are classified based on the plots of root mean square values for every position of the side hulls at different sea states in to determine optimal location of the side hulls with regards to seakeeping.
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