Research On Virtual Simulation System Of High Speed Ship Based On T-foil And Flaps

When the trisomy ship sails at high speed,the affect of rolling of the trisomy is very small and does not affect the normal sailing because of the special structure of the trisomy ship.But the pitching will directly affect the speed of ship,the comfort of persons on board and the stability of trisomy.T-foil and flaps are a kind of new equipment for reducing roll appeared in recent years.And the bottom of trisomy ship is smooth,the configuration of T-foil will not affect the structure characteristics of trisomy ship’s body.In this paper,we will disscuss the problems of longitudinal motion of trisomy with T-foil and flaps.In this paper,we research the structure of the trisomy ship.First,we need to set up inertial coordinate system and coordinate system with the movement of trisomy.In this coordinate,we start to analyse the force of the trisomy,it should move in six directions and have six degrees of freedom.We only set up a coordinate in vertical direction because the effection in rolling direction is very small.We can get the relationship of lift/lift distance and wave/ship body.Accoring to the model of the real ship,we use simulation and genetic algorithm to obtain the state space equation of the longitudinal motion of the trisomy ship,and the transfer function is derived.This can help us to deepen the understanding of the math model of trisomy ship,and clearly see the influence of the waving on the heave and pitch of trisomy ship.After establishing the accurate mathematical model of the trisomy ship and getting the transfer function of the real ship,we analyse the trisomy ship with T-foil and flaps.We can get the motion equation of the trisomy ship with T-foil and flaps through the analysis of trisomy ship with T-foil and flaps.According to the motion quation of the trisomy ship,we design the controller to control the angle of T-foil and flaps,so as to reduce the heave and pitch of the trisomy ship.Because of the coupling of T-foil and flaps,they have effects on the heave and pitch of trisomy ship together.So it is nessary to carry out the decoupling calculation.Using the base,the whole heave on flaps and the whole pitch on T-foil,as basic principle,the system is decoupled.After the complement of decoupling,we use LQR controller to design decoupling feedback controller.Finally,the feasibility of reducing the lift and sinking of the trisomy ship is verified by the T-foil and the flaps.In order to verify whether the designed controller can effectively reduce the longitudinal roll of the trisomy ship,it needs to be verified.As the cost of the real boat is too high,the cost of development will be greatly increased once the error is made.Therefore,we design virtual system to verify controller which is designed..In this paper,a trisomy ship visual simulation system is developed by combining Vega Prime with MFC.To develop the virtual simulation system,the three-dimensional model of the trisomy ship should be first drawn.In this paper,3D MAX2013 combined with Creator software is used to draw 3D models of trimaran,T-foil and flaps propotionally.We use shadow,color matching,light and so on,to achieve the true effect.The DOF node is set up according to the T-foil and the flaps movement.After the completion of the model,the LynX Prime software is used to load it into the ACF file,and the related ocean module and the effect of the sea wave are configured.Then,under the environment of VC++6.0 development,the simulation program of the trisomy ship is developed.The application includes the functions of scene rendering,model driving,human-computer interaction and so on.The control program is written in the software,and the related curve controls are written,and the system is simulated and verified.