Marine Engines and Auxiliary Machinery
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-3-7

Lapin Yu., German A., Burlakova N.

YURIY LAPIN, Master’s Degree Student, e-mail: yuralapin.98@mail.ru
ANDREY GERMAN, Associate Professor, ResearcherID: D-1725-2014,
ORCID: 0000-0002-9530-5258, ScopusID: 56417290300, e-mail: gerand1@yandex.ru
NATALIA BURLAKOVA, Lecturer, e-mail: mtemte@yandex.ru
Politechnical Institute
Far Eastern Federal University
Vladivostok, Russia

Analysis of the methods for calculating torsional vibrations of vessel shafts

Abstract: The outstanding issues of torsion vibrations of vessels' shaft lines in order to improve the accuracy of calculating the natural frequencies of torsion vibrations by determining the most accurate method of reducing the system to the discrete form. Two torsion-oscillating systems are studied: an experimental installation of a simple design (a two – support shaft with weights, driven by an electric motor) and a more complex one – the main propulsive unit of RBT project 378 port tug. With this purpose a number of problems have to be solved: calculation of installations with two methods (using classical equations for determining the inertial and elastic characteristics of the system and programs using finite element methods); torsiography of these systems to determine the values of experimental values of natural oscillation frequencies; comparative analysis of calculated and experimental values of natural oscillation frequencies and determination of the most accurate calculation methods on its basis.
It has been found that both calculation methods being considered lead to results of approximately similar accuracy. It is noted that the studied models are relatively simple in terms of their analysis and characterization. The picture may change in the case of more complex systems: then one of the methods considered may show a clear advantage.
Keywords: torsion vibrations, finite element method, ship power plant.

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