Investigation of the nonlinear moment influence on the parametric rolling of a ship
Abstract
The article discusses the definition of parametric roll charatecristics based on the formula of V.V. Lugovskiy. An additional non-linear moment MX 24 is taken into account. Mathematical formulation of the problem has been given, together with its solution. Test calculations of parametric roll for five ships of different types: passenger ship, oil tanker, container ship, timber carrier and bulk carrier — have been given. Roll calculations have been performed at heading angles of 60°, 90° and 120°. RAOs for ships have been calculated with and without non-linear moment consideration. The calculations have been carried out for a given static stability diagram with frequency graphs built based on the Vlasov method. A significant influence of non-linear moment on the maximum amplitudes of parametric rolling have shown, especially for the ship positioned in beam waves, thus demonstrating the need to take the non-linear moment.
About the Authors
V. Yu. Semenova
St. Petersburg State Marine Technical University, St. Petersburg
Russian Federation
Russian Federation
DSc, professor
D. A. Albaev
St. Petersburg State Marine Technical University
Russian Federation
Russian Federation
St. Petersburg
References
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Review
For citations:
Semenova V.Yu., Albaev D.A. Investigation of the nonlinear moment influence on the parametric rolling of a ship. Research Bulletin by Russian Maritime Register of Shipping. 2022;1(66/67):30-38. (In Russ.)
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