Dynamic motions of Ships in severe conditions of sea may be undesired and should be controlled by some devices. The roll motion is much more significant than the other oscillations which can affect comfort, safety and efficiency of navigation at sea. This motion is controlled by some common stabilizers such as rudder, fins, etc. They may be divided into two categories of passive and active stabilizers or controllers. However controlling devices may be high in cost. Moving masses are employed to reduce the motions of floating vessels or offshore structures. This type of stabilizers consists of a mass with one or more springs and dampers. The movement of the mass produces an inertia force and moment to absorb wave excited motions. In this study the effectiveness of moving masses in vessels with large roll motion is investigated. A rolling vessel equipped with a moving mass can be modeled as a two-degree of freedom system. As in large amplitude roll motion the nonlinearities cannot be neglected, a mathematical model with second-order damping and fifth-order restoring moment is implemented as roll equation in beam waves. Applying to a trawler, this equation is solved simultaneously with the equation of movement of the mass in both frequency-domain and time-domain by analytical and numerical approaches. The computation shows that with an optimum passive control, a moving mass with 0.5% of the displacement of the ship is an effective device in roll minimization and enhance the vessel’s stability in high load conditions.
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ASME 2010 International Mechanical Engineering Congress and Exposition
November 12–18, 2010
Vancouver, British Columbia, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4445-8
PROCEEDINGS PAPER
The Effectiveness of Moving Masses in Reducing the Roll Motion of Floating Vessels Available to Purchase
N. Montazeri,
N. Montazeri
Amirkabir University of Technology, Tehran, Iran
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S. H. Mousavizadegan,
S. H. Mousavizadegan
Amirkabir University of Technology, Tehran, Iran
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F. Bakhtiarinejad
F. Bakhtiarinejad
Amirkabir University of Technology, Tehran, Iran
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N. Montazeri
Amirkabir University of Technology, Tehran, Iran
S. H. Mousavizadegan
Amirkabir University of Technology, Tehran, Iran
F. Bakhtiarinejad
Amirkabir University of Technology, Tehran, Iran
Paper No:
IMECE2010-38574, pp. 101-107; 7 pages
Published Online:
April 30, 2012
Citation
Montazeri, N, Mousavizadegan, SH, & Bakhtiarinejad, F. "The Effectiveness of Moving Masses in Reducing the Roll Motion of Floating Vessels." Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition. Volume 8: Dynamic Systems and Control, Parts A and B. Vancouver, British Columbia, Canada. November 12–18, 2010. pp. 101-107. ASME. https://doi.org/10.1115/IMECE2010-38574
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