Loading...
Search for:
ghadimi--p
0.007 seconds
Neural network-PID controller for roll fin stabilizer
, Article Polish Maritime Research ; Volume 17, Issue 2 , 2010 , Pages 23-28 ; 12332585 (ISSN) ; Dadmarzi, F ; Ghadimi, P ; Ommani, B ; Sharif University of Technology
Abstract
Fin stabilizers are very effective devices for controlling the ship roll motion against external wave-generated moments. Lift forces due to flow around fin with an angle of attack produce anti - roll moment. Therefore control of attack angle plays important role in reducing roll of ships. This paper presents results of using a combined neural network and PID for roll control of ship with small draught. Numerical results are given of around-fin flow analysis with considering free surface effect modelled by neural network and imposed to controlling loop. Hydraulic machinery constraints are also considered in the modelling. The obtained results show good performance of the controller in...
Flow field analysis around the ship fin stabilizer including free surface
, Article Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 31 May 2009 through 5 June 2009, Honolulu, HI ; Volume 4, Issue PART A , 2009 , Pages 603-608 ; 9780791843444 (ISBN) ; Ghassemi, H ; Ghadimi, P ; Ommani, B ; Sharif University of Technology
Abstract
Fin stabilizers are very important device for controlling the ship roll motion against the external moments due to wave. This paper presents numerical results for flow field simulation and the hydrodynamic performance of fin stabilizer attached to a ship hull with free surface effects. Combination of CFD and RANS method has been used for this study. The fin is nonrectangular NACA0015 profile section with a finite aspect ratio. The numerical results include pressure distributions and flow field around the fin which are used to calculate lift coefficients and free surface elevation as the main interest. Some results are compared with available experimental and numerical data in literature and...