A Study Of Ship Lines Design Based On The Method Of Feature Design

Ship lines design has been playing the important role in ship design. In recent years, the technology of CAD/CAM got the extensive application in the ship lines design. The feature is a design concept of high time, it can reflects and includes a great deal of design intention of designer. The feature technique got the development in the development and applications of the CAD/CAM, requesting the further exaltation to produce the organization of gather turn and conceive to grow up in the history progress of the automation degree. Now, the feature technique has got the initial application in some professions. This paper leads the concept of feature design into the ship 1 ines design, inquires into the problem of ship 1 ines des ign based on the method of feature design.This paper recommends the Mathematical description for the curve and the curved face, and the matter of mathematical ship form. Ship form description is vital to hull form moulding in ship CAD. Traditional ship form description is treated with offsets. However, ship forms are so complex that it is usually hard to be described completely and definitely with a few tables or drawings. Which causes difficulties in ship design, manufacture and evaluation, and is not fit to the modern ship building practice. Through the investigation on the ship form data structure , the authors define a framework of complete ship form data base , and compare the effects of form descriptions using cumulated chord length spine with that using commonly used B-spline.In this paper, it is tried as well the method of alpace curve fairing with cumulated chord length spline. And by use of above geometry molding model and the space curve formulation, based on the data base theory, a software system for mathematical ship form moulding is developed.By which , a series of ship form moulding is performed and investigated , the good results show the applicability of this method. The ship form moulding method developed in this paper can be extended reading, to form a basis of a complete ship CAD / CAM integrated system.