The management of merchant ship stability, trim & strength

دسته بندی: حمل و نقل: کشتی ها
ویرایش:  
نویسندگان: Clark I.C.  
سری:  
 
ناشر:  
سال نشر:  
تعداد صفحات: 305 
زبان: English 
فرمت فایل : PDF (درصورت درخواست کاربر به PDF، EPUB یا AZW3 تبدیل می شود) 
حجم فایل: 44 مگابایت 

قیمت کتاب (تومان) : 45,000

The Nautical Institute, London, 2011, 303 p. — ISBN 187 00 77 59 8. A guide to the theory, rules and calculations carried out to ensure that a vessel maintains seaworthy stability and trim whilst remaining within its limits of strength. Author has explained the principles of applied physics that underlie the subject whilst always trying to keep the various aspects of trim, stability and strength within a practical context. An aspiring marine officer should find the different sections of the book useful throughout their career at sea, from cadet to marine superintendent. An Introduction to the shape of a ship's huilform and the principles of hydrostatics that act upon it.
Basic requirements of a good huilform. Definitions of hull measurements and features. The linesplan and table of offsets. Calculations for waterplane areas and submerged volume. The basic principles of buoyancy and floatation. Definitions of T.P.C. and F.W.A. An introduction to the principle of moments with regard to the forces of Weight, acting through the ship's Centre of Gravity, and Buoyancy acting through the immersed hull's Centre of Buoyancy. Definitions of a ship's motion in a seaway and the basic features ofseawaves. Locating the Centre of Buoyancy for different angles of heel
Introduction to changes of a hull's underwater shape with changing angle of heel. The shift in the Centre of Buoyancy off the centreline towards the low side of the ship and how this can produce a Righting Moment, providing that the C of B is outboard of the Centre of Gravity. The Righting Lever GZ defmed.The Metacentre 'M' defined as the point at which the C ofB rotates about during a small change in heel angle. The upright GM value is introduced as a measure of stability. The effects of hull beam and draft on the upright BM value and the changes in both the Metacentre s position and BM value with increasing angles of heel. The Wall-sided equation is explained and the Trapezium rules are used to show how the Centre of Buoyancy can be located at different angles of heel by applying the principles of moments to areas and volumes derived from the tables of offsets. KN Curves are defined as the means of expressing this shift of 'B'. Transverse stability characteristics and the GZ Curve
Stable, neutral and unstable conditions are defined in terms of the Centre of Buoyancy 'B', the Centre of Gravity 'G' and the Metacentre 'M'. The GZ curve is used to illustrate how a vessel's transverse stability changes with increasing angles of heel. The effects of a hull's beam, freeboard, draft, fineness of lines and sheer upon the GZ curve are discussed. The six basic criteria of seaworthiness, which must be met by a ship's GZ curve, are defined with an alternative set of criteria for High Fo 'c 'sle vessels. Operational transverse stability
The inclining experiment is explained as the means by which the Lightship KG value is measured. The loaded KG calculation is described by applying the Principle of Moments to the known loaded weight distribution. The Free Surface Effect of partly filled tanks and its importance in stability calculations is explained. The process of drawing an actual GZ curve from the supplied KN curves and the calculated fluid KG value is described. Use of simplified stability data diagrams. Calculating the heeling moment and list when 'G' is not on the centre line. Calculating the increase in draft due to a list. The effective centre of gravity of suspended loads and the stability calculations involved in loading a heavy lift. Heeling effect due to a ship turning under the action of the rudder. The unstable upright condition and the Loll angle are defined and procedures for regaining stability are outlined. A study into an incident of loss of stability in the case of a ship loaded with timber. Stability requirements for ships operating under special circumstances
Passenger vessels. Ship s carrying deck timber cargo. Ships carrying solid bulk cargo, including grain. Ships operating heavy lifts at sea. Windage allowance for ships carrying high deck stows of containers and ships operating in high latitudes where ice build up is a danger. Longitudinal stability and practical trim calculations
Longitudinal Centre of Buoyancy (LCB) and Longitudinal Metacentre. Longitudinal righting moments. The trim axis and centre of floatation (LCF), location of LCF for a given draft, shift in the LCB due to change of draft, estimating the longitudinal BM value for a vessel, the moment required to change trim by lcm (MCTC). Taking moments of weights about the aft perpendicular (AP) to predict a ship's fore and aft drafts. Average and mean drafts defined. The change of trim due afore and aft shift of weight. The change of trim when moving from salt to fresh water. Trim and stability calculations during drydocking. Beaching and stranding. A ship's motion in a seaway and anti-roll measures
The Simple Harmonic nature of a ship s natural roll period. Determining a ship's radius of gyration. Estimating the natural roll period in terms of ship s beam and GM values. Synchronised rolling. The effect of bilge keels. The action of flume tanks. Managing a ship in heavy weather to minimise rolling. Torsional and wracking stresses induced by rolling. Active anti-rolling devices, gyroscopic controlled stabilisers. The pitching characteristics of a ship. The natural pitching period of a ship. The pitching characteristics of a ship in a seaway. The problems of exceptional head seas. Pitch induced or parametric rolling. Shear forces, bending moments and longitudinal strength
The elastic properties of shipbuilding materials. Shear forces and bending moments defined. Longitudinal bending in a ship's hull, hogging and sagging. Bending moment calculations for a box shaped hull in various loaded conditions. The weight distribution of a ship. The still water buoyancy distribution of a ship shaped hull. Changes of buoyancy distribution in a seaway. Bonjean curves and Muckle 's method for buoyancy distribution calculations. Bending stresses defined. Moments of Inertia for different girder sections. Stress calculations for a ship's midships section. Stress distribution within a ship's structure. Composite hulls. Cracking. Some brief notes on shipbuilding methods. The consequences of flooding through bilging
The term 'bilging'and its effect upon a ship's draft, trim and stability explained. The 'lost buoyancy'approach to bilging calculations is compared to the 'added weight' method. Stability and trim calculations by the 'lost buoyancy' method explained by examples of bilging different compartments in a box-shaped hull. Permeability of partially loaded spaces defined. Predicting the effects of bilging different compartments in a real ship. The consequences of bilging a real ship and the need for cross flooding examined. Comparison made between the sinkings of the 'Titanic' and 'Andrea Doria'. The 'SOLAS' subdivision and damage stability requirements for passenger ships and cargo vessels and the 'MARPOL' tanker subdivision regulations
These rules are explained and examined with regard to their effects upon a ship s damage stability and trim. The International Load Line regulations for merchant ships
An outline to the background and aims of the load line regidations. Terms used in the regulations defined. Loadline markings described. Conditions of freeboard assignment explained. Tabulated and corrected freeboard explained. Seasonal and regional load lines explained. Compliance with the regulations explained.