Tracked Changes. Small craft - Determination of maximum propulsion power rating using manoeuvring speed

ABSTRACT This paper presents a review of some parametric interrelationships between size, weight, hull proportions, propulsion power, and craft speed of modern, monohull, planing-type, marine craft. Parametric relationships are presented in terms related to lifting-surface theory rather than in more conventional "naval architectural" terms such as hull volume coefficients and area coefficients. The scope of the paper includes a brief review of the technical approach used to accomplish the analysis and typical results of the work. Charts which provide a means for approximation of power/ performance relationships are also presented. Performance estimates derived by means of the charts are compared with data derived from the careful and thorough testing of several full-size craft.

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Estimation Local Strength of Bow Structure for High Tensile Steel Yacht Based on Optimum Design

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.1463 ◽

2006 ◽

Vol 326-328 ◽

pp. 1463-1466

Author(s):

Joo Shin Park ◽

Yun Young Kim ◽

Tetsuya Yao

Keyword(s):

Optimum Design ◽

Minimum Weight ◽

Analysis Model ◽

Element Analysis ◽

Stress Criterion ◽

Local Strength ◽

The Finite Element Analysis ◽

Small Craft ◽

Weight Design

The optimum design for bow structure of high tensile steel yacht belongs to the nonlinear constrained optimization problem. The determination of scantlings for the bow structure is a very important matter out of whole structural design process of a yacht. The optimum design results are produced with the use of Real-coded Micro-Genetic Algorithm including evaluation LR small craft guideline, so that they can satisfy the allowable stress criterion. In this study, the minimum weight design of bow structure on the HTS yacht was carried out based on the finite element analysis. An analysis model is a bow structure of HTS yacht with structural scantling derived from the minimum weight optimization. The weight of bow structure and the main dimensions of structural members are chosen as an objective function and design variable, respectively. Optimization results were compared with a pre-existing design. From the FE analysis results, bow structure with high tensile steel (AH40) designed by using RμGA has a volume efficiency of 19% than the design of the actual mild yacht.

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