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An experimental investigation of ride control algorithms for high-speed catamarans Part 1: Reduction of ship motions

Citation

Alavimehr, J and Lavroff, J and Davis, MR and Holloway, DS and Thomas, GA, An experimental investigation of ride control algorithms for high-speed catamarans Part 1: Reduction of ship motions, Journal of Ship Research, 61, (1) pp. 35-49. ISSN 0022-4502 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 Society of Naval Architects & Marine Engineers

DOI: doi:10.5957/JOSR.61.1.160041

Abstract

Ride control systems are essential for comfort and operability of high-speed ships, but it remains an open question what is the optimum ride control method. To investigate the motions of a 112-m high-speed catamaran fitted with a ride control system, a 2.5-m model was tested in a towing tank. The model active control system comprised two transom stern tabs and a central T-Foil beneath the bow. Six ideal motion control feedback algorithms were used to activate the model scale ride control system and surfaces in a closed-loop control system: heave control, local motion control, and pitch control, each in a linear and nonlinear version. The responses were compared with the responses with inactive control surfaces and with no control surfaces fitted. The model was tested in head seas at different wave heights and frequencies and the heave and pitch response amplitude operators (RAOs), response phase operators, and acceleration response were measured. It was found that the passive ride control system reduced the peak heave and pitch motions only slightly. The heave and pitch motions were more strongly reduced by their respective control feedback. This was most evident with nonlinear pitch control, which reduced the maximum pitch RAO by around 50% and the vertical acceleration near the bow by about 40% in 60-mm waves (2.69 m at full scale). These reductions were influenced favorably by phase shifts in the model scale system, which effectively contributed both stiffness and damping in the control action.

Item Details

Item Type:Refereed Article
Keywords:ship motions, catamarans, high speed craft, ride control
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Transport
Objective Group:Water Transport
Objective Field:Passenger Water Transport
Author:Alavimehr, J (Mr Seyedjavad AlaviMehr)
Author:Lavroff, J (Dr Jason Lavroff)
Author:Davis, MR (Professor Michael Davis)
Author:Holloway, DS (Dr Damien Holloway)
Author:Thomas, GA (Professor Giles Thomas)
ID Code:114998
Year Published:2017
Web of Science® Times Cited:1
Deposited By:Engineering
Deposited On:2017-03-04
Last Modified:2017-04-10
Downloads:0

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