Research On Risk Evaluation Method Of Carrier-based Aircraft Landing

As one of the maritime combat equipment,the aircraft carrier which is a symbol of national naval power and has extraordinary strategic significance,provides a safe movement platform for the take-off and landing of carrier-based aircraft.On the sea with complex and changeable environment,it is a challenging and dangerous task that the carrier-based aircraft needs to ensure landing accurately and arresting successfully on the limited angled deck of the aircraft carrier.With the development and improvement of modern ship landing technology,related control theories have become increasingly mature,which can control the stability and robustness of the system,but the risk of carrier-based aircraft landing has not been fully introduced into the evaluation indicators.However,the landing effectiveness evaluation task is very essential,which is the safety guarantee for actual combat flight.Firstly,in this paper,the simulation model of carrier-based aircraft landing is established.Starting from the carrier-based aircraft,dynamics and kinematics mathematical models are analyzed,and the nonlinear model of the carrier-based aircraft is completed.The model of aircraft carrier motion and the wake flow field is analyzed to constitute the landing environment.On this basis,the flight control system model is designed and a complete integrated simulation system platform for carrier-based aircraft landing is established.Secondly,the performance evaluation of the guidance law design and deck motion prediction algorithm of the carrier-based aircraft simulation model is carried out to further improve the simulation system.The time domain and frequency domain performance of the ALCS system are analyzed to make the system meet the response requirements.The accuracy of the deck motion estimation algorithm which is designed based on the AR autoregressive model is verified,as well as the compensation strategy is introduced to improve the design of the outer loop guidance law.At the same time,the environmental factors of the landing process are analyzed,and the safety envelope of each flight state is determined based on the baseline method,which can monitor the real-time flight data throughout the process.Thirdly,the effectiveness evaluation of carrier-based aircraft landing results is studied.A large amount of data is obtained by landing simulation platform.Based on the normal cloud map of the risk level of the landing point is ruled by cloud model theory.Combined with the information entropy the index weights are dictated.Similarity between the data to be evaluated and each risk level is calculated by fuzzy closeness principle.By applying he principle of maximum similarity,landing risk rating result is carried out.Finally,the effectiveness evaluation of carrier-based aircraft during landing is studied.According to the standard of risk cloud model,the triangular fuzzy language scale of the key position of the ship landing process is determined.The parameter value and the relative closeness of ideal solution of four key positions are obtained based on the Technique for Order Preference by Similarity to Ideal Solution(TOPSIS)improved by Gray Relation Analysis(GRA),which realizes the effectiveness ranking of the multi-voyage landing process.