1.2 Prerequisites..................................................................................................................7
1.3 Course Structure............................................................................................................7
1.4 Using this guide.............................................................................................................8
1.4.1 Exercise format......................................................................................................... 8
1.5 Overview.........................................................................................................................9
1.6 The Graphical User Interface.......................................................................................10
1.7 Tool Bars......................................................................................................................11
2 The Basics............................................................................................13
2.1 Axes Conventions........................................................................................................13
2.2 Units..............................................................................................................................14
2.2.1 Working units.......................................................................................................... 14
2.2.2 Input/Output units.................................................................................................... 14
2.3 Curve Identification......................................................................................................14
2.4 The GUI.........................................................................................................................15
2.4.1 Basic viewing.......................................................................................................... 15
2.4.2 Additional viewing facilities...................................................................................... 18
2.4.2.1 The View dialogue............................................................................................ 18
2.4.3 Display lock............................................................................................................. 20
2.5 Zoom, Window, etc......................................................................................................20
2.5.1 Window into an area ............................................................................................... 20
2.5.2 Zoom and Pan functions......................................................................................... 21
2.6 The Curve bar...............................................................................................................21
2.7 Listing the contents of a datastore.............................................................................22
2.8 Opening another datastore.........................................................................................23
2.9 Ending a Lines session...............................................................................................23
Exercise 1...................................................................................................24
3 Creating a new project.........................................................................27
3.1 Initial data.....................................................................................................................27
3.1.1 File formats............................................................................................................. 28
3.1.1.1 General particulars........................................................................................... 28
3.1.1.2 Stem and Stern Profiles ................................................................................... 28
3.1.1.3 FOS, FOB, Knuckles, Tangents and Plines...................................................... 28
3.1.1.4 Sections........................................................................................................... 28
3.2 Creating a new datastore.............................................................................................29
3.3 Creating curves............................................................................................................30
3.3.1 Setting the X value format....................................................................................... 30
3.3.2 Create curve dialogue............................................................................................. 30
3.3.2.1 Importing data from a file.................................................................................. 31
3.3.2.2 Entering data manually..................................................................................... 31
3.3.2.3 Fitting a curve to the data................................................................................. 32
3.4 Editing a curve.............................................................................................................32
3.4.1 Fitting...................................................................................................................... 32
3.4.2 Point manipulation................................................................................................... 34
3.4.3 Saving, quitting and undoing changes..................................................................... 34
3.5 Saving the datastore....................................................................................................35
Exercise 2...................................................................................................36
4 3D Control Curves................................................................................43
4.1 Creating 3D control curves.........................................................................................43
4.1.1 Creating 3D curves in an orthogonal plane.............................................................. 43
4.1.2 Creating a complex 3D curve.................................................................................. 43
4.1.2.1 Creating the Clines........................................................................................... 44
4.1.2.2 Merging the Clines........................................................................................... 44
4.1.3 Interrogating a curve............................................................................................... 46
Exercise 3...................................................................................................47
5 Controlling the parallel Mid body........................................................51
5.1 Creating the pmb sections..........................................................................................51
5.2 Changing curve type....................................................................................................52
5.3 Angle curves................................................................................................................52
5.3.1 Creating an angle curve by interpolation................................................................. 54
5.3.2 Creating an angle curve from a data file.................................................................. 54
Exercise 4...................................................................................................56
6 Fitting sections & waterlines...............................................................57
6.1 Fitting the initial sections............................................................................................57
6.1.1 Importing the data file.............................................................................................. 57
6.1.2 Fitting the data........................................................................................................ 57
6.1.2.1 Fit..................................................................................................................... 58
6.1.2.2 Get................................................................................................................... 58
6.2 Fitting Waterlines.........................................................................................................59
Exercise 5...................................................................................................60
7 The End Surface...................................................................................61
7.1 Defining the end surface.............................................................................................64
7.1.1 The half siding/radius tab........................................................................................ 64
7.1.1.1 Stemhs and Sternhs macros............................................................................ 65
7.1.2 End Surface tab...................................................................................................... 65
7.1.3 Update tab.............................................................................................................. 66
7.1.4 End type tab............................................................................................................ 66
Exercise 6...................................................................................................67
8 Surface patches...................................................................................71
8.1 Patch generation rules and restrictions.....................................................................71
8.2 Patch arrangement considerations.............................................................................73
8.3 Starting PACE..............................................................................................................76
8.4 The PACE graphical user interface.............................................................................77
8.4.1 Standard tool bar..................................................................................................... 78
8.4.2 View tool bar........................................................................................................... 78
8.4.3 Patching tool bar..................................................................................................... 78
8.4.4 Curve tool bar ......................................................................................................... 78
8.5 Displaying curves and view manipulation..................................................................78
8.5.1 Displaying curves.................................................................................................... 78
8.5.2 Interactive zooming, Panning and Rotating............................................................. 79
8.5.3 Window box zoom and view reset........................................................................... 79
8.5.4 Creating a new window........................................................................................... 79
8.6 Patch Boundaries.........................................................................................................80
8.6.1 Designating a patch boundary................................................................................. 80
8.6.2 Creating patch boundaries by interpolation............................................................. 80
8.6.2.1 Graphical selection of data points..................................................................... 81
8.6.2.2 Removing points from a curve.......................................................................... 83
8.6.2.3 Inserting data points......................................................................................... 84
Exercise 7...................................................................................................85
8.7 Automatic generation of the Patches.........................................................................93
8.7.1 Tangency tab.......................................................................................................... 94
8.7.2 Smoothing tab......................................................................................................... 94
8.7.3 Data Points tab ....................................................................................................... 95
8.7.4 General tab............................................................................................................. 95
8.8 Displaying the surface patches...................................................................................96
8.8.1 Smooth shading...................................................................................................... 96
8.8.2 Isophotes................................................................................................................ 97
8.8.3 Isoparametric.......................................................................................................... 98
8.8.4 Tangency................................................................................................................ 98
8.8.5 Control points.......................................................................................................... 99
8.9 Modifying surface patches..........................................................................................99
8.9.1 Changing the patch options..................................................................................... 99
8.9.2 Changing patch tangency conditions......................................................................101
8.9.3 Modification of the patch control points ..................................................................102
8.10 Saving the surface...................................................................................................103
8.11 Checking the patch boundary continuity Lines....................................................103
8.11.1 Outputting the DML file...........................................................................................104
Exercise 8.................................................................................................105
9 Hull Distortions and drawings...........................................................109
9.1 SAC curve distortion..................................................................................................109
9.1.1 The SAC tab ..........................................................................................................109
9.1.2 The Distortion tab...................................................................................................110
9.2 Scaling.........................................................................................................................111
9.3 Extrapolation...............................................................................................................111
9.4 Drawings......................................................................................................................112
9.4.1.1 Viewing the drawing file...................................................................................113
Exercise 9.................................................................................................114
10 Simple hullform modelling techniques..........................................117
10.1 Simple Multi chine vessels.....................................................................................117
10.1.1 Listing of the chine macro ......................................................................................118
Exercise 10...............................................................................................121
Appendix 1...............................................................................................133
Fairing....................................................................................................................................133
Curvature display.................................................................................................................133
Auto Fairing .........................................................................................................................134
Updating intersecting orthogonal curves..............................................................................135
Updating Patches.................................................................................................................136
Appendix 2...............................................................................................137
Refining the definition using 3D curves..............................................................................137
Creating separate datastores...............................................................................................137
Generating the initial 3D curves...........................................................................................138
Creating the Clines ..............................................................................................................138
Creating the 3D curves ........................................................................................................140
Comparing the sections........................................................................................................142
Modifying the Hullform using 3D Curves.............................................................................143
Interpolation of Additional Sections....................................................................................148
Interpolating Waterlines and Buttocks................................................................................149
1 Introduction
This guide is provided as an accompaniment to the Lines (Design) training course, which lasts three days.
The primary objective of the course is to provide the user with sufficient knowledge to be able to input the basic data for a new design and generate a surface suitable for use in Compartment and Basic Design.
The course also covers the generation of decks and the various methods by which an existing Lines model can be used as a parent form to produce a new design.
In addition, an appendix is provided that shows various ways in which a basic hullform may be modified. This is provided as an addition to the course, which can be covered if time permits and it is of interest to the trainees.