Minimum ship size for seakeeping

Abstract

This paper describes a computational procedure to determine the minimum ship size to achieve the required seakeeping performance for a given design speed in a specified sea state. The procedure contains four basic elements: a procedure for representing alternative hull form designs with various sizes, a procedure for predicting the seakeeping performance of a given design, a non-linear direct search procedure and a user interface to provide the objectives and the constraints of the problem. The seakeeping performance of the ship in a specified sea area is expressed as a function of the ship size. A non-linear optimization problem is then formulated and solved by using non-linear direct search techniques. The objective is to find the minimum ship size satisfying given seakeeping criteria for a given design speed in a specified sea state. A typical example of determining the minimum dimensions for a patrol boat design is presented. The resultant design is shown to be the smallest vessel that could operate without violating the given set of seakeeping criteria.

Keywords

Seakeeping ship design optimization non-linear direct search

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