Merchant Ship Stability

Merchant Ship Stability presents the theory and application of methods for maintaining ship stability. It serves as a textbook for deck officers and first year degree students. The book discusses the methods of Simpson's rules for measuring ship form, the principle of floatation, finding the position of the center of gravity, and the effect of the center of gravity of the vessel not being on the centerline, the effect of having liquids within the vessel which are free to move and the effect of suspending weights. Topics on the assessment of stability of large angles of heel, regulations about merchant vessel stability, and dry docking and grounding are provided as well. Deck officers and merchant marine students will find the book very useful.

Preface

Chapter 1 Ship Form and Measurement

Objectives

Definitions

Relationships Between Dimensions

Measurement of Area

Examples

Moments of Areas and Volumes and Centroids

Application of Simpson's Rules

Questions on Simpson's Rules

Answers

Chapter 2 Flotation

Objectives

Pressure

Archimedes' Principle

Principle of Floatation

Displacement

Tonne Per Centimetre Immersion

Examples

Definitions

Load Lines

Questions on Hydrostatics

Answers

Questions on Load Line

Answers

Chapter 3 Determination of Position of Centre of Gravity

Objectives

Position of Centre of Gravity Relative to Keel and Centre Line

Shift of Weight

Adding or Removing a Single Weight

Questions on KG

Answers

Chapter 4 Conditions of Equilibrium

Objectives

Conditions of Equilibrium

Stable Equilibrium for a Ship

Neutral Equilibrium for a Ship

Unstable Equilibrium for a Ship

Assessment of Initial Stability

Transverse Metacentre of a Box Shaped Vessel

Examples

BM for a Ship Shape

Examples

Questions on GM

Answers

Chapter 5 List and Free Surface

Objectives

List

Examples

Effect of Suspending Weights

Questions on List

Answers

Free Surfaces

Effect of Longitudinal Subdivision

Effect of Transverse Subdivision

Examples

Questions on Free Surfaces

Answers

Calculation of Initial KG—The Inclining Test

Examples

Unresisted Rolling in Still Water

Questions on Inclining Test

Answers

Increase in Draft Due to Heel

References

Chapter 6 Stability at Large Angles of Heel

Objectives

Form of GZ Curves

Features of GZ Curve

Dynamical Stability

Stability Requirements Under Load Line Rules

Conditions of Equilibrium From GZ Curves

Effect of Form on GZ Curve

Effect of Shifting Weights Within the Vessel

Examples

Grain

Examples

Heel Due to Wind Loading

Examples

Chapter 7 Calculation of Righting Level and Assessment of Stability

Objectives

KN Curves

Examples

Questions

Answers

Wall-Sided Vessels

Angle of Loll

List When GM0=0

Examples

Questions on Wall-Sided Formula

Answers

Simplified Stability Information

Examples

Questions

Answers

Chapter 8 Longitudinal Stability—Trim

Objectives

Definition of Trim

Effect of Loading Or Discharging a Weight at the Centre of Flotation

Change of Trim

Distribution of Trim

Examples

Mean Draft

Examples

Change of Trim Due to Change in Density

Examples

Calculation of Trim when Handling Large Weights

Examples

Determination of Displacement (Draft Survey)

Examples

Questions on Trim

Answers

Chapter 9 Dry Docking and Grounding

Objectives

Dry Docking

Assessment of Reduction in KM

Assessment of Rise in Effective KG

Examples

Grounding

Examples

Questions on Dry Docking and Grounding

Answers

Chapter 10 Bilging

Objectives

Flooding and Stability

Permeability

Examples

Bilging of a Midships Side Compartment

Bilging of an End Compartment

Examples

Questions on Bilging

Answers

Chapter 11 Bending Moment, Shear Force and Torsion

Objectives

Shear and Bending

Examples

Effect of Waves

Bending Stress and Shear Stress

Calculations of Shear Force and Bending Moment

Questions on Bending Moment and Shearing Force

Answers

Torsion

Chapter 12 Squat Interaction and Turning

Objectives

Squat

Interaction

Turning

Directional Stability

Heel while Turning

Index