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Control design of fin roll stabilization in beam seas based on Lyapunov's direct method

100%

Karakas S. C., Ucer E., Pesman E.

Polish Maritime Research

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2012

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tom 19

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nr 2

The aim of this study is to design a controller based on Lyapunov’s direct method for fin roll stabilization systems for ships in beam seas. A third order mathematical model consisting of uncoupled roll motion of a ship and fin hydraulic system dynamics is considered. In the model, random wind force is defined by Gaussian white noise. Both controlled and uncontrolled roll motions are presented considering stall effect by roll-time history and safe basin graphics. It is observed from the results that fin control system is successful to reduce erosion percentages of safe basins and roll amplitudes

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Numerical and analytical approaches for roll motion analysis in regular longitudinal waves

100%

Pesman E., Kolukisa D. C., Taylan M.

Polish Maritime Research

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2015

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tom 22

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nr 3

In this study numerical and analytical approaches were investigated in terms of accuracy of their results, practicality of solution and ability to reproduce the main features of the parametric roll phenomenon such as loss of stability and bifurcations in parametric roll motion analysis of ships. In general, single-degree-of-freedom analytical approach is based on reducing number of degrees of freedom from 3 to 1 by using the quasi-static Froude-Krylov assumption, incorporating heave and pitch effects by means of a time varying restoring moment. On the other hand, numerical approaches to motion of six and four degrees of freedom are based on three dimensional diffraction/radiation and potential flow theories. In summary, this paper reveals that analytical approaches are sufficiently adequate to obtain accurate practical results for this relatively complex phenomenon

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Comparison of reinforced oxygen delignification methods for old corrugated board (OCC) fibres

88%

Koc B. O., Gumuskaya E., Erisir E., Kirci H., Pesman E.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

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2017

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tom 60

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nr 199

Ograniczanie wyników

2 Polish Maritime Research

1 Drewno. Prace Naukowe. Doniesienia. Komunikaty

3 Pesman E.

1 Erisir E.

1 Gumuskaya E.

1 Karakas S. C.

1 Kirci H.

1 Koc B. O.

1 Kolukisa D. C.

1 Taylan M.

1 Ucer E.

1 2017

1 2015

1 2012

Control design of fin roll stabilization in beam seas based on Lyapunov's direct method

Numerical and analytical approaches for roll motion analysis in regular longitudinal waves

Comparison of reinforced oxygen delignification methods for old corrugated board (OCC) fibres