Metacentric height

Ship stability diagram showing centre of gravity (G), centre of buoyancy (B), and metacentre (M) with ship upright and heeled over to one side. Note that for small angles, G and M are fixed, while B moves as the ship heels, while for big angles both B and M are moving.

Initially the second moment of area increases as the surface area increases, increasing BM, so Mφ moves to the opposite side, thus increasing the stability arm. When the deck is flooded, the stability arm rapidly decreases.

Distance GZ is the righting arm: a notional lever through which the force of buoyancy acts

The metacentric height (GM) is a measurement of the initial static stability of a floating body. It is calculated as the distance between the centre of gravity of a ship and its metacentre. A larger metacentric height implies greater initial stability against overturning. The metacentric height also influences 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.

单词	Centre of buoyancy
释义	Centre of buoyancy 英语百科 Metacentric height The metacentric height (GM) is a measurement of the initial static stability of a floating body. It is calculated as the distance between the centre of gravity of a ship and its metacentre. A larger metacentric height implies greater initial stability against overturning. The metacentric height also influences 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.
随便看	ophthalmic posterior microsurgical instrument set的意思 ophthalmic preparation的意思 ophthalmic prescriptions的意思 ophthalmic pulse electromagnetic magnet的意思 ophthalmic radiodiagnostics的意思 ophthalmic reaction的意思 ophthalmic record的意思 ophthalmic recurrent nerve的意思 ophthalmic remedy的意思 ophthalmic rosasea的意思 ophthalmic的意思 ophthalmic scalpel的意思 ophthalmic scissors的意思 ophthalmic segment的意思 ophthalmic sensitometer的意思 Ophthalmic service or procedure的意思 ophthalmic siderosis的意思 ophthalmic solidifying unit的意思 Ophthalmic solution的意思 ophthalmic solutions的意思 ophthalmic somite的意思 ophthalmic spongioma的意思 ophthalmic steroid preparation的意思 ophthalmic strips的意思 Ophthalmic sulfonamide preparation的意思

Centre of buoyancy

Metacentric height