eCite Digital Repository

An experimental investigation on slamming kinematics, impulse and energy transfer for high-speed catamarans equipped with Ride Control Systems

Citation

AlaviMehr, J and Lavroff, J and Davis, MR and Holloway, DS and Thomas, GA, An experimental investigation on slamming kinematics, impulse and energy transfer for high-speed catamarans equipped with Ride Control Systems, Ocean Engineering, 178 pp. 410-422. ISSN 0029-8018 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier Ltd.

DOI: doi:10.1016/j.oceaneng.2019.02.004

Abstract

High‐speed craft frequently experience large wave impact loads due to their large motions and accelerations. One solution to reduce the severity of motion and impact loadings is the installation of ride control systems. Part 1 of this study investigates the influence of control algorithms on the motions of a 112‐m highspeed catamaran using a 2.5‐m model fitted with a ride control system. The present study extends this to investigate the influence of control algorithms on the loads and internal forces acting on a hydroelastic segmented catamaran model. As in Part 1, the model active control system consisted of a center bow T‐Foil and two stern tabs. Six motion control feedback algorithms were used to activate the model‐scale ride control system and surfaces in a closed loop system: local motion, heave, and pitch control, each in a linear and nonlinear application. The loads were further determined with a passive ride control system and without control surfaces fitted for direct comparison. The model was segmented into seven parts, connected by flexible links that replicate the first two natural frequencies and mode shapes of the 112‐m INCAT vessel, enabling isolation and measurement of a center bow force and bending moments at two cross sections along the demi‐hulls. The model was tested in regular head seas at different wave heights and frequencies. From these tests, it was found that the pitch control mode was most effective and in 60‐mm model‐scale waves it significantly reduced the peak slam force by 90% and the average slam‐induced bending moment by 75% when compared with a bare hull without ride controls fitted. This clearly demonstrates the effectiveness of a ride control system in reducing wave impact loads acting on high‐speed catamaran vessels.

Item Details

Item Type:Refereed Article
Keywords:ride control systems, high-speed catamarans, model test, control algorithm, slam energy
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
UTAS Author:AlaviMehr, J (Dr Javad Mehr)
UTAS Author:Lavroff, J (Dr Jason Lavroff)
UTAS Author:Davis, MR (Professor Michael Davis)
UTAS Author:Holloway, DS (Associate Professor Damien Holloway)
UTAS Author:Thomas, GA (Professor Giles Thomas)
ID Code:131408
Year Published:2019
Deposited By:AMC Governance Office
Deposited On:2019-03-17
Last Modified:2019-10-22
Downloads:0

Repository Staff Only: item control page