Metacentric height is a criterion for ship stability . It is an elevation of the metacenter above the center of gravity of the floating body. The larger this parameter, the higher the initial stability of the vessel. When acquiring a negative metacentric height, the vessel loses its ability to float without a roll . It is not possible to answer the question “will a ship with a negative metacentric height” turn over, since the metacentric theory of stability is correct only when the ship inclines no more than 10 degrees.
However, the Rules of classification societies supervising the technical operation of vessels ( Russian River Register , Russian Maritime Register of Shipping , etc.) prohibit the operation of vessels having a metacentric height of less than 0.2 m. A characteristic example of a body having zero metacentric height , is a symmetric floating keg. When in calm water, such a barrel will rotate along the longitudinal axis under the influence of any external forces (for example, wind).
Links
- METACENTRIC HEIGHT . The appeal date was July 19, 2011. Archived March 26, 2012.
Literature
- Handbook of the theory of the ship: In three volumes. Volume 2. Static ships. Boat swing / ed. Ya. I. Voitkunsky. - L .: Shipbuilding, 1985. - 440 p.
- Semenov-Tyan-Shansky, V.V. Statics and ship dynamics. - L .: Shipbuilding, 1973.
- Manual on the struggle for the survival of the vessel (NBZhS), RD 31.60.14-81. With attachments and additions. SPb, TsNIIMF, 2004