Hull Form Table of Offsets Sections 2.3 - 2.4 Ship Hull Form and Geometry The ship is a 3-dimensional shape: Data in x, y, and z directions is necessary to represent the ship hull Table of Offsets Lines Drawings: Body Plan (front view)
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Presentation Transcript
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Hull Form & Table of Offsets Sections 2.3 - 2.4<br>
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Ship Hull Form and Geometry The ship is a 3-dimensional shape:
Data in x, y, and z directions is necessary to represent the ship hull Table of Offsets
Lines Drawings:
Body Plan (front view)
Sheer Plan (side view)
Half Breadth Plan (top view)<br>
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Hull Form Representation Lines Drawings:
Traditional graphical representation of the ship’s hull form…“Lines” Half-Breadth Plan Sheer Plan Body Plan<br>
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Hull Form Representation Lines Plan Half-Breadth Plan (Top) Sheer Plan
(Side) Body Plan
(Front / End)<br>
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Body Plan Intersection of planes to define section line
Front View
Sectional lines show the true shape of the hull form
“Slices of Bread” are called stations
Forward sections from amidships : Right Side
Aft sections from amidships : Left Side
Middle slice = Midships 1 1 2 2 3 3 3 4 5 3 4 5<br>
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Sheer Plan Intersection of planes (buttock lines) parallel to the centerline plane
“Side View”
“Slices” are called buttock lines (cut like a hot dog bun instead of loaf of bread)
Middle slice = centerline 1 1 2 2<br>
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Half-Breadth Plan Intersection of planes (waterlines) parallel to the baseline (keel).
“Half and Half on top of coffee” or Hamburger Bun
Typically just one side due to symmetry
“Slices” are called waterlines 1 1 2 2 3 3<br>
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Basic Dimensions and Hull Form Characteristics LOA(length over all) : Overall length of the vessel. Bow to Stern
DWL(design waterline) : Water line where the ship is designed to float
FP(forward perpendicular) : imaginary vertical line where the bow intersects
the DWL
AP(aft perpendicular) : imaginary vertical line located at either the rudder
stock or intersection of the stern with DWL
Stations : parallel planes from forward to aft, evenly spaced (like bread).Normally an odd number to ensure an even number of blocks.<br>
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Basic Dimensions and Hull Form Characteristics Lpp AP FP DWL Shear Lpp (length between perpendiculars) : horizontal distance from FP and AP
Amidships ( ) : the point midway between FP and AP
Shear : longitudinal curvature given to deck<br>
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Table of Offsets Table of numbers used to convert graphical information to a numerical representation of a three dimensional body
Lists the distance from the center plane to the outline of the hull at each station and waterline
There is enough information in the Table of Offsets to produce all three lines plans
Numerical coordinates for the 3 (Body, Sheer, and Half-Breadth) Plans<br>
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Table of Offsets The distances from the centerplane are called the offsets or half-breadth distances.<br>
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Table of Offsets Example Given the following table of offsets, draw the body plan for stations 0, 2, 8 and 10<br>
