Simulation And Experimental Research On The Rendezvous And Docking Process Of Ferry Airship

At present,the main takeoff and landing mode of aircraft is land airport,which is greatly affected by airport site selection.The coverage rate of water on the earth’s surface is much greater than that of land,so it has always been concerned that realizing aircraft taking off and landing on the water surface can get rid of the bondage of land taking off and landing.there are several ways for aircraft to take off and land on water,such as building a water airport,installing a fixed buoy,and aircraft carrier,etc.all of which have their own limitations.This thesis proposes a scheme for a ferry airship that assists aircraft in taking off and landing on the water.The ferry airship has the characteristics of low cost,well concealment and maneuverability,while retaining the aircraft’s endurance and maneuverability to the greatest extent.This thesis deeply researches the specific process of the combination of airplane and ferry airship in the air.To find the law of motion in the process of combining the two aircraft in the air,a simulation experiment method for the aircraft in water is proposed to replace the air experiment of the aircraft.Through simulation,it is proved that the prediction of the trajectory of the aircraft is similar to the air experiment.Use CFD calculation software to calculate the dimensionless dynamic coefficients of aircraft and ferry airship under different angles of attack and rudder angles in the water;using Simscape Multibody,a multi-body dynamics module library in Simulink,a kinematics simulation model of the docking process of two aircraft in water was established,and the hydrodynamic coefficients were applied to the calculation of the hydrodynamic force and moment of the simulation model to realize the calculation of the flight trajectory before and after the rendezvous and docking of the two aircraft.This thesis expands on the research of the docking process of aircraft and ferry airship in the air,proposes a blocking buffer docking scheme based on strut,blocking rope and vacuum cylinder,and completes a complete simulation model of the combination of the two aircraft in the air.The cushion and traction effects of the vacuum cylinder are verified by comparison simulation;the speed difference and relative altitude of the safe docking between the aircraft and the ferry airship in this case are obtained.The main contents of study results are as follows:After the two-aircraft rendezvous and docking,the combined body has a trend towards a downward pitch angle,and a movement trajectory sinking relative to the original state of the aircraft;the canard is placed on the head of the ferry airship,which can make the pitch angle downward and trajectory sinking tendency smaller,and there is an optimal deflection angle of canard,which can make the correction effect of the canard reach the best value.Through model simulation verification,the blocking buffer device proposed in this thesis can play a role in assisting the combination of aircraft and ferry airship.Under the boundary conditions of this study,the safe speed difference is 10 m/s,and the relative height of the rendezvous and docking limit is related to the speed difference.When the speed difference is less than 8 m/s,it is stable at 8 m.