Effective method used to create the analytical models of large sets of curves _ application for the ship hull body plan

6th ModTech International Conference - Modern Technologies in Industrial Engineering

Oanta, E.^1 ; Hreniuc, V.C.^2 ; Grosu, C.D.^1

Constanta Maritime University, Faculty of Naval Electro-Mechanics, 104 Mircea cel Batran Street, Constanta

900663, Romania^1

Constanta Maritime University, Faculty of Navigation and Naval Transport, 104 Mircea cel Batran Street, Constanta

900663, Romania^2

关键词: Buoyancy forces;    Complex pattern;    Complex shapes;    Data extraction;    Defined functions;    Equilibrium problem;    Image files;    Level model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/400/4/042043/pdf
DOI  :  10.1088/1757-899X/400/4/042043

来源: IOP

【 摘 要 】

Information presented graphically as diagrams may be expressed analytically in order to be used in computer based analytical models. The paper presents several methods to extract the coordinates of the points which define a curve whose drawing is stored as a pdf or as an image file. The output information is expressed as text files in CSV format which may be easily accessed by other applications. If the data extraction methods are used for a complex pattern of curves, such as the sectional lines of a ship hull body plane, there must be conceived a hierarchy of data structures which makes the information readily accessible from upper level models. The analytically expressed sectional lines are useful to model the buoyancy forces, which are a part of the loads' submodel and of the buoyancy centre's location, necessary to solve the ship equilibrium problems. After we convert the coordinates of the drawing in units of length by using scaling and translation, we analyse a sectional line and we conclude that its complex shape may be expressed as a piecewise-defined function of the breadth with respect of the draft. The necessary data used to structure the information of the body plan is also presented in the paper.