Abstract
The vertical movement of a trimaran caused by external disturbances during sailing, may lead to seasickness of the passengers and damage of the equipment onboard. Based on computational fluid dynamics (CFD) calculations, the hydrodynamic coefficients are obtained and a mathematical model of the trimaran is established, and with experiments of trimaran sailing in water tanks, the hydrodynamic coefficients solved by CFD are verified. Then, the T-foil and flap are designed, and the lift force and moment are solved by CFD. Next, the slope of the force of different attack angles on the T-foil and flap is obtained by the polynomial fitting. Finally, the trimaran vertical stabilization proportion and derivative (PD) controller, based on the sigmoid function, is designed with a new method of the resultant force and moment for a dynamic decoupling T-foil and flap. Through the simulation of trimaran movements systems with active T-foil and flap, the PD parameters are obtained. Then, the effect of the controller on trimaran vertical stabilization is verified by the experiments in the water tanks.
Highlights
A trimaran is a kind of multihull ship and it can produce movement when sailing in the sea
[3] designed a bilge keel to reduce the roll motion, [4] used fin and rudders to alleviate the roll motion, T-foil and tabs are used in the ride control system and can reduce the heave and pitch effects [5]
The active control algorithm, references [10], [11], show that the fast ferry with a T-foil and flaps was effective in reducing the vertical movement using WVA as a proportion and derivative (PD) control index
Summary
A trimaran is a kind of multihull ship and it can produce movement when sailing in the sea. The active control algorithm, references [10], [11], show that the fast ferry with a T-foil and flaps was effective in reducing the vertical movement using WVA as a PD control index. Z. Liu et al.: Vertical Stabilization Control for Trimaran Based on Resultant Force and Moment Distribution actual engineering. Reference [24] showed the computational process of wave to heave and pitch, the computational process divided into wave energy spectrum, wave force and moment, and ship movement equation.
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