EN342: Ship Hydrostatics and Stability
EN342 Ship Hydrostatics and Stability (3-2-4).
Theories and procedures for predicting a ship’s hydrostatic response to various conditions are addressed. Methods for computing the stability characteristics of both intact and damaged ships are studied. Floodable length computations are taught. Stability and subdivision criteria are explained. The lines plan for a hull form is developed and analyzed.
Class notes and laboratory handouts
- Describe methods for calculating a ship’s hydrostatic properties, including calculation of areas, volumes, centroids, and important hydrostatic parameters such as Δ, LCF, LCB, KB, KM, TPI, MT1”.
- Draw and interpret a ship’s lines drawing.
- Calculate and assess basic intact, impaired and damaged stability characteristics of a ship. Specifically, calculate metacentric height (GM), calculate and plot righting arm curves (GZ), and calculate changes in drafts and trim for weight additions, removals, or shifts.
- Describe basic methods to calculate a ship’s damaged stability and trim and determine required watertight subdivision, including development of floodable length curves.
- Describe basic design criteria for assessing intact and damaged stability of naval and merchant ships, including intact and damaged heeling moment and righting energy criteria, and extent of damage and watertight subdivision criteria.
- Describe basic characteristics of submarine hydrostatics, stability and trim, including the equilibrium polygon, and basic hydrostatic and hydrodynamic effects on depth control.
EN247 Principles of Naval Architecture or EN245Principles of Ocean Systems Engineering, NAOE Department
- Naval Architecture Terminology
- Hydrostatic Pressure and Archimedes’ Principle
- Centers of Buoyancy, Flotation and Gravity
- Ship’s Hull Form; Form Coefficients; Lines Drawing & Table of Offsets
- Changes to Center of Gravity due to Weight Additions, Removals and Shifts
- Initial Stability and Metacentric Height
- Impaired Stability: Free Surface, Grounding/Drydocking
- Longitudinal Stability and Draft Changes – Weight Additions, Removals and Shifts
- Numerical Integration of Areas, Volumes and Centroids
- Intact Overall Stability and Righting Arm Curve; Cross-Curves of Stability
- Weight Changes on Righting Arm Curve
- Curves of Form, Bonjean Curves
- Inclining Experiment
- Intact Stability Criteria
- Damage Stability – Added Weight and Lost Buoyancy Methods
- Load Lines and Floodable Lengths
- Subdivision Criteria
- Submarine Hydrostatics, Stability and Trim
- FF-7 Trim Lab
- FF-7 Inclining Experiment
- FF-7 Righting Arm Lab
- FF-7 Flooding Experiment