Research On Wheeled Takeoff And Landing Technology Of Hypersonic Aircraft By Openning The Resistance Umbrella At Low Altitude

Hypersonic aircrafts are the current focus of the world,it is of great importance in actual warfare or tactical shock.Hypersonic aircrafts differ greatly from conventional low-speed aircrafts in aerodynamic shapes and weight characteristics.Because the aerodynamic shape of the hypersonic aircrafts is not suitable for the retracting of the landing gear,and the approach speed is very large,designing a takeoff and landing device that meets the characteristics of a hypersonic aircrafts is the biggest challenge for the utility of hypersonic vehicles.Based on the MATLAB/Simulink platform,flight mechanics model of hypersonic aircraft about openning the resistance umbrella at low-altitude is established in this paper,which contain aerodynamics,ground force,braking force,deceleration force and control force of the rudder surface.For the aerodynamic shape of the hypersonic aircraft,it is not suitable for the retracting and landing of the landing gear,and the approach speed is large.Starting from the idea of reducing the total energy of the aircraft landing and recycling,a program about openning the resistance umbrella at low-altitude is proposed,and a flight mechanics model with full-degree-of-freedom aircraft with umbrella landing is bulit.And the simulation and analyse are carried out.The influence of aircraft landing energy under different working conditions of the parachute is discussed,and the landing energy of the aircraft grounding is reduced as much as possible,thereby reducing the design index requirements of the landing gear and minimizing the constraints of the landing gear on the overall design of the aircraft.In the process of aircraft ground running,the idea of segmentation deceleration of the resistance umbrella system and the braking system was proposed.The ground running model with the resistance parachute system was established to verify that the parachute system can shorten the landing time and landing distance.At the same time,based on the rudder deflection correction system and the differential brake correction system,the dynamic influence of the resistance resistance umbrella system on the ground slip of the aircraft and its influence on the correction control system are analyzed under the interference of the crosswind and other factors during the ground slip of the aircraft.And analyze the reasons for the results.