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Metacentric height also has implication on the natural period of rolling of a hull, with very large metacentric heights being associated with shorter periods of roll which are uncomfortable for passengers. Hence, a sufficiently high but not excessively high metacentric height is considered ideal for passenger ships. Estimation Methods for Basic Ship Design Prof. Manuel Ventura Ship Design I MSc in Marine Engineering and Naval Architecture M.Ventura Estimation Methods 2 Summary • Hull Form • Lightship Weight • Deadweight Components ... Metacentric Height KM 23 13.61 45.4 52.17 19.88BB BTechnical Information No. TEC-0722 Date 15 January 2008 To whom it may concern As instructed by the Maritime and Coastguard Agency as attached, the onboard computers for oil, chemical and gas carriers flying UK flag should be capable of compliance with the damage stability requirements prior to departure of the vessel to sea. .

In the case posed above with the box shaped hull the metacentric height is a function of the induced roll resulting from moving the CofG laterally. Moving the CofG laterally will move the CofB laterally and this alters the second moment of area of the waterplane so the metacentric heigt changes. Rick W• the transverse stability. A vessel with a large transverse metacentric height will have a higher natural frequency than an equivalent vessel with a low metacentric height. This is why most catamarans have a more rapid motion than monohulls. • the roll mass moment of inertia of the yacht, AND the inertia of the water

RAJIV GANDHI COLLEGE OF ENGINEERING AND TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING MECHANICS OF FLUIDS UNIT I 1. A wooden block of specific gravity 0.75 floats in water. If the size of the block is 1m X 0.5 m X 0.4 m, find its metacentric height. 2. A solid cylinder 2m in diameter and 2m high is floating in water with its axis vertical. If theCalculating KB, BM, and metacentric diagrams 107 Example 3 The second moment of a ship's water-plane area about the centre line is 20 000 m 4 units. The displacement is 7000 tonnes whilst ¯oating in dock water of density 1008 kg per cu. m. KB 1.9 m, and KG 3.2 m. Calculate the initial metacentric height. 7000 Â 1000 cu. m 6944 cu. m Useful for FM & AH Practicals.

A Critical Assessment of Ship Parametric Roll Analysis Hisham Moideen, Texas A&M University. Jeffrey Falzarano Texas A&M University, ABSTRACT . Analysis of ship parametric rolling has generally been restricted to simple analytical models and sophisticated time domain simulations. However, simple analytical models do not capture all GM metacentric height GM L longitudinal metacentric height GZ righting arm I moment inertia KB height of the center of buoyancy KG height of the center of gravity MATRIX.DOC Page v Tuesday, July 18, 2000 3:51 PM pendent swell component of arbitrary height, period and direction can be specified simultaneously with the irregular sea. For towline design purposes the analysis of system response to wave excitation, described above, is supplemented by a wave-frequency analysis of towline performance which is unencumbered by the

the metacentric radius. An analytical model, based on a simplified geometric representation of the ship hull, possibly as a polyedric surface, could be built for the estimation of the position of the buoyancy center and of the metacentric radius. Specifically, the metacentric height is calculated based on 13. Metacentric height for small values of angle of heel is the distance between the a) centre of gravity and centre of buoy-ancy b) centre of gravity and metacentre c) centre of buoyancy and metacentre d) free surface and centre of buoyancy Ans: b 14. A floating body is said to be in a state of stable equilibrium

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