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planing-vessels
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Nonlinear Control of a Monohull Planing Vessel, Using Sliding Mode
, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor)
Abstract
A sliding mode nonlinear controller has been developed to control a monohull hard-chine planing vessel. Planing vessels has been used for shoreward marine missions. On the other hand, according to vast shores of our country, offshore applications could be of extra importance for us. Autopilot of a vessel consists of two stages: trajectory design and trajectory control. In this project, trajectory control is being done using sliding-mode nonlinear control method, considering the fact that according to nonlinear dynamics of planing vessels, linear control would not show desirable results. In this dissertation, after description of main information about planing vessels and prior researches,...
Minimization of time to reach final speed in planing craft by optimal control of drive and trim tab angles
, Article FAST 2013 - 12th International Conference on Fast Sea Transportation ; 2013 ; Seif, M. S ; Mehdigholi, H ; Sharif University of Technology
FAST 2013 Secretariat
2013
Abstract
Properly adjusting the trim angle during the craft speed up, plays an important role in easily passing through the resistance hump and to reach final speed in minimum possible time. Present study tries to reply to this question that how the angles applied to a trimmable drive system and trim tab of the planing craft should be changed during speed up from rest, to craft reach a final speed in minimum time. This is a time-optimal control problem with the drive and trim tab angles as its control variables. To solve this problem a 3-DOF dynamic model is developed here rely on empirical data and relations. For the propulsion system operation of propeller, drive and engine altogether are taken...
A unified computational method for simulating dynamic behavior of planing vessels
, Article China Ocean Engineering ; Volume 23, Issue 3 , 2009 , Pages 517-528 ; 08905487 (ISSN) ; Jahanbakhsh, E ; Panahi, R ; Karimi, M. H ; Sharif University of Technology
2009
Abstract
High speed planing hulls have complex hydrodynamic behaviors. The trim angle and drafts are very sensitive to speed and location of the center of gravity. Therefore, motion simulation for such vessels needs a strong coupling between rigid body motions and hydrodynamic analysis. In addition, free surface should be predicted with good accuracy for each time step. In this paper, velocity and pressure fields are coupled by use of the fractional step method. On the basis of integration of the two-phase viscous flow induced stresses over the hull, acting loads (forces and moments) are calculated. With the strategy of boundary-fitted body-attached mesh and calculation of 6-DoF motions in each time...