Ship Hydrostatics and Stability

Adrian Biran, Rubén López-Pulido, Ruben Lopez Pulido

• Publisher: Butterworth-Heinemann
• Year: 2013
• eBook ISBN: 9780080982908
• Edition: 2
• Topic: Physical Sciences
• Subtopic: Fluid Mechanics

Ship Hydrostatics and Stability is a complete guide to understanding ship hydrostatics in ship design and ship performance, taking you from first principles through basic and applied theory to contemporary mathematical techniques for hydrostatic modeling and analysis. Real life examples of the practical application of hydrostatics are used to explain the theory and calculations using MATLAB and Excel.The new edition of this established resource takes in recent developments in naval architecture, such as parametric roll, the effects of non-linear motions on stability and the influence of ship lines, along with new international stability regulations. Extensive reference to computational techniques is made throughout and downloadable MATLAB files accompany the book to support your own hydrostatic and stability calculations.The book also includesdefinitions and indexes in French, German, Italian and Spanish to make the material as accessible as possible for international readers.- Equips naval architects with the theory and context to understand and manage ship stability from the first stages of design through to construction and use.- Covers the prerequisite foundational theory, including ship dimensions and geometry, numerical integration and the calculation of heeling and righting moments.- Outlines a clear approach to stability modeling and analysis using computational methods, and covers the international standards and regulations that must be kept in mind throughout design work.- Includes definitions and indexes in French, German, Italian and Spanish to make the material as accessible as possible for international readers.

Chapter 1

Definitions, Principal Dimensions

Abstract

This chapter introduces the main notions and terminology related to the main dimensions of the ship and the description of the hull surface. The external surface of a ship hull built of steel or aluminium alloy is usually not smooth because the thickness of the shell plating is not uniform. Moreover, in the initial design stage the thickness is not known. Therefore, the main dimensions are defined on the inner surface of the plating and are characterized as moulded dimensions. The principal dimensions are the length between perpendiculars, the moulded breadth known also as beam, the draught and the depth. The classic way of defining the hull surface is by plane sections. The transverse sections are called stations, the horizontal ones waterlines, and the longitudinal buttocks. To classify the various ship forms and relate them to other properties naval architects use non-dimensional numbers known as coefficients of form.

Keywords

Principal dimensions; Moulded dimensions; Hull surface; Ship lines; Body plan; Waterlines; Buttocks; Table of offsets; Coefficients of form

1.1 Introduction

The subjects treated in this book are the basis of the profession called Naval Architecture. The term Naval Architecture comes from the titles of books published in the 17th century. For a long time the oldest such book we were aware of was Joseph Fursttenbach’s Architectura Navalis published in Frankfurt in 1629. The bibliographical data of a beautiful reproduction are included in the references listed at the end of this book. Close to 1965 an older Portuguese manuscript was rediscovered in Madrid, in the Library of the Royal Academy of History. The work is due to João Baptista Lavanha and is known as Livro Primeiro da Architectura Naval, that is “First book on Naval Architecture.” The traditional dating of the manuscript is 1614. The following is a quotation from a translation due to Richard Barker:

“Architecture consists in building, which is the permanent construction of any thing. This is done either for defence or for religion, and utility, or for navigation. And from this partition is born the division of Architecture into three parts, which are Military, Civil and Naval Architecture.

…

And Naval Architecture is that which with certain rules teaches the building of ships, in which one can navigate well and conveniently.”

The term may be still older. Thomas Digges (English, 1546–1595) published in 1579 an Arithmeticall Militarie Treatise, named Stratioticos in which he promised to write a book on “Architecture Nautical.” He did not do so. Both the British Royal Institution of Naval Architects—RINA—and the American Society of Naval Architects and Marine Engineers—SNAME—opened their web sites for public debates on a modern definition of Naval Architecture. Out of the many proposals appearing there, that provided by A. Blyth, FRINA, looked to us both concise and comprehensive:

“Naval Architecture is that branch of engineering which embraces all aspects of design, research, developments, construction, trials, and effectiveness of all forms of man-made vehicles which operate either in or below the surface of any body of water.”

If Naval Architecture is a branch of engineering, what is engineering? In the New Encyclopedia Britannica (1989) we find:

“Engineering is the professional art of applying science to the optimum conversion of the resources of nature to the uses of mankind. Engineering has been defined by the Engineers Council for Professional Development, in the United States, as the creative application of ‘scientific principles to design or develop structures, machines …’”

This book deals with the scientific principles of Hydrostatics and Stability. These subjects are treated in other languages in books bearing titles such as Ship theory (for example Doyère, 1927; Godino, 1956; Mirokhin et al., 1989) or Ship statics (for example Hervieu, 1985; Godino, 1956). Further scientific principles to be learned by the Naval Architect include Hydrodynamics, Strength, Motions on Waves, and more. The “art of applying” these principles belongs to courses in ship design.

1.2 Marine Terminology

Like any other field of engineering, Naval Architecture has its own vocabulary composed of te...

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright
• Dedication
• Biography
• Preface to the Second Edition
• Preface to the First Reprint
• Preface
• Chapter 1. Definitions, Principal Dimensions
• Chapter 2. Basic Ship Hydrostatics
• Chapter 3. Numerical Integration in Naval Architecture
• Chapter 4. Hydrostatic Curves
• Chapter 5. Statical Stability at Large Angles of Heel
• Chapter 6. Simple Models of Stability
• Chapter 7. Weight and Trim Calculations
• Chapter 8. Intact Stability Regulations I
• Chapter 9. Stability in Waves
• Chapter 10. Intact Stability Regulations II
• Chapter 11. Flooding and Damage Condition
• Chapter 12. Linear Ship Response in Waves
• Chapter 13. Computer Methods
• Answers
• Chapter 24. Bibliography
• Index in English
• Index in French
• Index in German
• Index in Italian
• Index in Spanish