Modelling cyclic reverse movements of the vessel using modified Lammeren's curves of screw action
Автор: Pashentsev S.V.
Журнал: Вестник Мурманского государственного технического университета @vestnik-mstu
Рубрика: Эксплуатация водного транспорта
Статья в выпуске: 4 т.21, 2018 года.
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In our national practice, the screw action curves are traditionally used either for positive values of the screw speed n and the vessel's velocity v, or when one of these characteristics of the movement is negative. Consequently, the used curves of the screw action do not allow to create computer simulators for testing specific maneuvering tasks with reversible moves. The purpose of the work is to study the opportunities of mathematical modelling of the vessel's reverse movements, when the propeller advance of the fixed pitch screw is constantly changing. In foreign sources, really universal Lammeren's curves of screw action can be found. The specificity of these curves is that the introduction to them is performed not due to the pitch ratio itself, but due to the angle b of the direction incident to the propeller blade. This angle is determined by using tangent tg(b) = v /(0.7 π nD ), and it is sensitive to the change of sign of both the ship's velocity v and the revolution speed n...
Короткий адрес: https://sciup.org/142217108
IDR: 142217108 | DOI: 10.21443/1560-9278-2018-21-4-566-576
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