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Calculation of the heeling moment generated on a ship’s hull during turning maneuver based on measurements of the angle of heel as a function of time

Szozda Zbigniew, Nowakowski Piotr

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2021

nr 68 (140)

9--16

Ships' stability criterion due to turning is not up-to-date and requires amendments. Redesigning the criterion should be based on scientific research, but there is a lack of accurate procedures and formulas enabling the calculation of the heeling moment caused by centrifugal forces as a function of time. Measurements of a ships’ heel caused by turning on a model-scale or full-scale may provide a basis for such an analysis. This paper creates such a procedure, including appropriate formulas, leading to the extraction of the heeling moment caused by centrifugal force from other heeling moments acting on a ship during turning. One model-scale experiment is described in detail, and the results of the calculations are presented. The paper concludes that it is possible to extract this moment as a function of time and presents an example of such a calculation.