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2019 | Buch

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Hydrostatics and Stability of Marine Vehicles

Theory and Practice

verfasst von: Byung Suk Lee

Verlag: Springer Singapore

Buchreihe : Springer Series on Naval Architecture, Marine Engineering, Shipbuilding and Shipping

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

This book addresses the hydrostatics and stability of ships and other floating marine structures - a fundamental aspect of naval architecture and offshore engineering for naval architects and marine engineers. It starts from the most basic concepts, assuming that the reader has no prior knowledge of the subject. By presenting the topic in a methodical and step-by-step manner, the book helps students to enhance their understanding, while also providing valuable guidelines for lecturers teaching related courses.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Basic Ship Geometry

Abstract

It is superfluous to say that the first main property of all surface ships is that they float on the water whilst carrying payloads. Consequently the main hull of a ship is basically a watertight box.

Byung Suk Lee

Chapter 2. Flotation

Abstract

Most people have heard, usually at school, the funny but exhilarating story of Archimedes running through the street of ancient Syracuse stark naked shouting ‘Eureka!’ Well he might!

Byung Suk Lee

Chapter 3. Moments and Centroids

Abstract

One of the most important concepts in engineering is moments, of various order, of lines, areas, volumes, masses and forces. One can even talk of a moment of a moment. Indeed, the area of a 2-D shape can be called its 0th moment (the lever is brought up to the power of 0). Of these infinite number of moments, the first and second moments are encountered the most often in various disciplines of naval architecture. Here we shall confine our discussion up to the second moments of area, volume and mass.

Byung Suk Lee

Chapter 4. Numerical Integration Methods

Abstract

Not surprisingly, integration in various forms keeps appearing in hydrostatics, since area is calculated by integrating line lengths and volume by integrating sectional areas and so on. It is hardly an exaggeration to say that most of hydrostatic calculations were based on moment theories and integration of one sort or another.

Byung Suk Lee

Chapter 5. Trim and Longitudinal Stability

Abstract

Stability of a ship is defined as its ability to return to the normal operating attitude when disturbed from it by transitory forces or moments. This concept will be explored in more detail in the next chapter, but here it is worthwhile to note that most ships have sufficient longitudinal stability in their intact condition and, therefore, it can be considered to be of little interest to us in terms of safety. However, the longitudinal stability affects the trim of the vessel directly, and trim is a very important factor in determining the operational efficiency of ships. We shall, therefore, briefly examine here the longitudinal stability with emphasis on trim.

Byung Suk Lee

Chapter 6. Statical Stability at Small Heel Angles

Abstract

All ships should have adequate stability in all their operating conditions. This statement sounds almost too obvious and simple to deserve a serious consideration, but it raises two important questions: firstly, what is stability; and secondly how do we define ‘adequate’? We cannot even begin to answer the second until we have answered the former.

Byung Suk Lee

Chapter 7. Statical Stability at Large Heel Angles

Abstract

The stability characteristics of a vessel at large angles of heel are in general very much different from those of initial stability or stability at very small angles of heel. It may be recalled that stability of a vessel can be quantified in terms of righting moment or, for a given displacement, righting arm.

Byung Suk Lee

Chapter 8. Dynamical Stability

Abstract

So far the subject of ship stability has been discussed considering that the sea is calm and the ship is stationary, not moving in any mode at all. It is evident that this assumption is wrong and the motion will have to be taken into consideration somehow. It was in mid-1850s when the idea of dynamical stability was introduced in an attempt to relate the stability of a ship to its rolling motion. It is of course clear that most ships which capsize do so after rolling excessively and indeed the capsizing itself is a kind of rolling motion. Therefore, it is quite right that we should relate the rolling motion to stability, although other modes of motion may be ignored for the time being while we consider vessels in their intact condition.

Byung Suk Lee

Chapter 9. Intact Stability Criteria

Abstract

Over the centuries many ships have been lost at sea through capsizing either because of operational errors and/or lack of inherent stability of ships whether intact or damaged. In the past, even though people were concerned about the maritime safety, particularly those whose lives and livelihood depended on it, certain degree of risk was accepted as inherent in maritime activities. Venturing out to sea on a ship was regarded as an ‘adventure’. In risk-averse modern times, however, such cavalier attitude towards ship safety is no longer acceptable and people have endeavoured to set acceptable standards.

Byung Suk Lee

Chapter 10. Basic Concept of Damage Stability and Watertight Subdivision

Abstract

Damage to a vessel which compromises the watertight integrity of the hull will lead to ingress of water into the compartment(s) of the vessel. The flooding consequent to the broaching of the watertight skin of the ship will affect the attitude of the vessel, i.e. trim, draught and heel, and the stability characteristics will be affected, usually for the worse. The ‘remaining’ stability after sustaining damage is known as residual or damage stability.

Byung Suk Lee

Backmatter

Titel: Hydrostatics and Stability of Marine Vehicles
verfasst von: Byung Suk Lee
Verlag: Springer Singapore
Electronic ISBN: 978-981-13-2682-0
Print ISBN: 978-981-13-2681-3
DOI: https://doi.org/10.1007/978-981-13-2682-0