CREATE

Purpose

Create various curves, input the Frame Table and define the parallel midbody.

Syntax

Description

The various curves and other data that can be CREATEd are described below. Refer to Section 5 for a fuller description of their use and data file formats.

CREATE ANGLE

Allows the user to generate a 2D curve associated with a given KNUCKLE or TANGENT for specified line set. The data for the curve can be entered via a FILE or by INTERSECTING the specified Knuckle or Tangent with each curve in line set and calculating the slope of the curve at this intersection point. the ANGLE curve generated can be 'faired' in the usual manner and then stored.

Whenever a GET operation takes place which intersects a Knuckle or Tangent which has an associated Angle curve the Angle curve is interpolated and resultant angle is attached to the intersection point. When a curve is PREFIT with these ANGLE POINTS defined the fitting algorithm will ensure that curve passes through these points with the interpolated angle. Knuckles curves may have a LOWER and UPPER angle curve associated with them.

The Angle curves are stored in the Cline directory with the following naming conventions:

Examples

CREATE CAMBER

Creates a 2-D curve which is used in the construction of the file deck frames. Data points for curve may be input from a FILE, copied from the points BUFFER, generated by combining a series of CLINES or inserted using the CURSOR. Camber curves must be created in section view at any height but they should start at the centreline and go up to or beyond the shell of the ship.

Examples

CREATE CLINE

Create a 2-D construction curve which may in turn be used to create 3-D curves. Cline should be created in the views they are used in for example, If a Cline is to be used in the construction of a Camber line then it should be created in Section View.

Clines may be created either from data FILE, from the points BUFFER or interactively using the graphics CURSOR. Alternatively a Cline can be created to represent on of the following geometric types:

Examples

CREATE FOB, FOS, STEM and STERN

These curves can be created using data points from a FILE or copied from the points BUFFER. Radii curves can also be automatically estimated from the halfsiding curve.

Examples

CREATE STEM and STERN ENDSURFACE

Create the stem or stern end surface from existing radii, eccentricity and waterline data.

Examples

CREATE FRAME

The frame table is input from a FILE.

Examples

CREATE KNUCKLE

Allows the user to create a 3-D curve which will generate a knuckle point when intersected. Data points for the curve may be input from a FILE, copied from the points BUFFER or may be generated by INTERSECTING a CLINE with Sections, Waterlines or Buttocks.

Examples

CREATE PLINE

Allows the user to create a 3-D curve which will generate an ordinary point when intersected. Data points for the curve may be input from a FILE, copied from the points BUFFER or may be generated by INTERSECTING a CLINE with sections, Waterlines or Buttocks.

Examples

CREATE PMB

Defines the MIDSHIP section and extent of the PARALLEL MIDBODY. The user is required to specify the extent of the PMB by specifying the AFT and Forward section positions. Two boundary curves are created; PMB Aft and PMB Forward

Data from the general particulars and from user defined parameters through the DEFINE MIDSHIP command will be used to create the PMB curves. The parameters that are available are as follows

:

Alternatively, points for the PMB section can be read from a file

Examples

CREATE SHEER

Allows the user to create a 2-D curve which is used in the construction of the deck frames. Data points for the curve may be input from a FILE, copied from the points BUFFER, generated by combining a series of CLINES or inserted using the CURSOR. Sheer curves must be created in Buttock view and should extend up to or beyond the frame positions required. The height of the curve will reflect the height of the deck.

Examples

CREATE TANGENT

Allows the user to create a 3-D curve which will generate a tangent point when intersected. Data points for the curve may be input from a FILE, copied from the points BUFFER or may be generated by INTERSECTING a CLINE with Sections, Waterlines or Buttocks.

Examples