1. Studies On Hull Form Design by Means of Nonlinear Programming

概要

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The hull form design can be regarded as a kind of the problem of nonlinear programming, because the objective function is generally specified as the nonlinear functional of the hull form and many constraints of equality or inequality types are needed in the practical design stage. In the present state, however, the nonlinear programming is commonly used in the field of structural design, in spite of its flexibility and possibility in practical applications to almost all engineering problems. In this paper, the author discusses the hull form design based on the wave resistance theory by means of the nonlinear programming. Two types of the problem are studied as examples of the hull form design. One is the determination of the best curve of sectional area under several side conditions, in which a wall-sided ship is assumed. The other problem is the improvement of a given hull form with practical frame lines in order to reduce the total resistance. It is shown by numerical examples and experimental verifications that the nonlinear programming technique provides a rational method for the design of good hull forms.
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