Based on measurement campaigns onboard a Panamax and a post-Panamax containership, high-frequency hull girder vibrations on fatigue damage were assessed by calculating cumulative damages. High-frequency hull girder response extracted from these measurements was super-imposed on damage obtained form numerical seakeeping calculations of the rigid ships. Numerical analyses accounted for the duration of measured seaways, the ship's heading relative to prevailing directions of encountered seaways, and the ship's forward speed. Routes traveled by the post-Panamax ship during the Far East measurement campaign were characterized by relatively mild seaways, a situation that was reflected by relatively low damage ratios. To represent world-wide service routes, the measured high-frequency contributions were utilized to predict high-frequency response of the two ships operating also in severe seaways occurring in the North Atlantic and the North Pacific.
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