Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chap.1: Ship Structure (Structural Components (Keel (◦Large center plane…
Chap.1: Ship Structure
Structural Components
-
-
Longitudinal
◦Girders running parallel to the keel along the bottom
◦Intersects floors at right angles
◦Provides longitudinal strength
Floor
◦Deep frame running from the keel to the turn of the bilge
◦Frames may be attached to the floors (Frame would be the part above the floor)
Plating
◦Thin pieces enclosing the top, bottom and side of structure
◦Contributes significantly to longitudinal hull strength
◦Resists the hydrostatic pressure load (or side impact)
Stringer
◦ Girders running along the sides of the ship
◦ Typically smaller than a longitudinal
◦ Provides longitudinal strength
-
-
Frame
◦A transverse member running from keel to deck
◦Resists hydrostatic pressure, waves, impact, etc
Framing System
Increase ship’s strength by:
-Adding framing elements more densely
-Increasing the thickness of plating and structural components.
-All this will increase cost, reduce space utilization
and allow less mission-related equipment to be added
-
-
-
Double Bottoms
The double bottom provides a space for storing
-Fuel oil
-Ballast water & fresh water
-Smooth inner bottom which make it easier to arrange cargo & equipment and clean the cargo hold
Two watertight bottoms with a void space in between to withstand
-the upward pressure
-bending stresses
-bottom damage by grounding and underwater shock
-
Ocean Design Wave
-
We can consider the wave forces on a ship to be quasi-static. This means that they can be treated as a succession of equilibrium states
● When a wave passes by a vessel the worst hogging moment occurs when the midbody is on the crest of a wave, and the bow and stern are in the troughs
● The wave height (peak to trough) is generally assumed to be 1/20th of the wave length (any larger and the wave will break)