Research On The Influence Of Atmospheric Disturbances On The Carrier-based Aircraft' Distribution Of Touchdown Point

The safe landing of carrier-based aircraft is the key to maintain the sustained combat effectiveness of aircraft carriers.In the process of landing,the speed of the carrier-based aircraft is larger,while the carrier landing platform provided by the aircraft carrier is much smaller than the runway of the roadbed airport,which poses a great danger to the carrier-based aircraft landing.At the same time,the influence of aircraft carrier hull movement on the carrier-based aircraft touchdown point is uncertain under the complex sea conditions.The aircraft carrier needs to travel headwind in the possess of landing.At this time,the atmospheric disturbance generated by the ship-aircraft system,which formed from the aircraft carrier and the carrier-based aircraft interact with each other,has the characteristics of nonlinearity,randomness and unsteadiness.It has great influence on carrier landing and is an important factor leading to the failure of carrier-based aircraft landing.Therefore,there are great significance to study the influence of atmospheric disturbances on the dispersion of carrier-based aircraft landing points.In this paper,a certain type of carrier-based aircraft model is used as research object to analyze the influence of atmospheric disturbance components on the touchdown point dispersion of carrier-based aircraft.Based on the Sum of Squares(SOS)planning technique and the Lyapunov stability theory,the state feedback controller is designed for the polynomial LPV system of the carrier-based aircraft after processing.Using the single-factor analysis of variance method and the combination of decision tree with linear regression method,qualitative and quantitative analysis is carried out on the landing point distribution of the carrier-based aircraft under the influence of each component of the atmospheric disturbance.The specific contents of this paper are as follows:Firstly,the causes of each component of atmospheric disturbance are analyzed,and the mathematical models of each component are established.In view of the nonlinearity,randomness and unsteady characteristics of atmospheric disturbance,a stationary stochastic process theory is used to describe the atmospheric disturbance model,and the simulation diagram of each component is given through the Matlab/Simulink simulation platform.Secondly,considering the continuous change of the aerodynamic forces and moments of the carrier-based aircraft as the altitude changes due to the carrier-based aircraft landing,a downslope is designed.Based on the trajectory the aircraft longitudinal nonlinear model is converted into parameter-dependent LPV system.Then,based on the polynomial LPV system,adopts the SOS planning technology and Lyapunov stability theory to design state feedback controller,which make the closed-loop system asymptotically stable,and carrier-based aircraft can safely land on a scheduled trajectory.Finally,because of the influence of atmospheric disturbance,the touchdown point of carrier-based aircraft is uncertain,and it is difficult to make wave-off decisions based on real-time atmospheric disturbance.Using single-factor variance analysis qualitatively analyze the influence of atmospheric disturbance components on the touchdown point distribution of carrier-based aircraft.The classification prediction model is established by combining the decision tree with linear regression,and based on this model,the decision for carrier-based aircraft wave-off is made.