Simulation Of Key Technology Of Lanuch And Land For Carrier-based Aircratf

The system of aircraft carrier and carrier-based aircraft is the key part of modern aircraftcarrier formation combat system and carrier-based aircraft is the most power weapon of thecombat system. Aircraft carrier which is the activity platform of carrier-based aircraft musthave the abililties of take off and landing. Therefore, it is necessary to study the keytechonology of take off and landing which includes that: slippery jump take-off technology,catapult launch technology, approach guide technology, LSO technology, approach powercompensator technology; landing arresting technology and so on. In this paper, catapultlaunch technology, approach power compensator technology and landing arresting technologyare going to be simulated and studied. The following contents ar researched:1. The method of simulating stationary random process is introduced. The method oftransforming space power spectrum to time power spectrum is presented. The geometrycharacteristics of landing deck and sea wave model are gived. The model of deck motion withpractical engineering value is provided. In the following, the landing carrier disturbance ofMIL-HDBK-1797is selected as the object to study and analysize. The filters of free-airturbulence components are presented by used of the method which transfers space powerspectrum to time power spectrum. The method of changing transfer function to space state isproposed to solve the problem of time-varying parameters in the random component of carrierairwake. The Simulation model is constructed in Matlab and the simulating result isanalysized.2. The catapult launch which is may divided into6distinct portions: preloading of bridle,catapult force building-up with holdback, power stroke, free deck run with all gears on deck,free deck run with nose only past deck edge and fly away is analysized. A simplifieddynamics model of catapult launch based on fast-extension of nose gear is constructed. Loadoscillations and dynamics charateristics of main load-carrying components of nose gear arediscussed. The influence of fast extension on catapult launch is researched. The law of flyaway of carrier-based aircraft is studied. The influencing factors of catapult launch areanalysized. The influence of the fore disturbance on catapult launch is discussed. The lengthof deck edge distance is analysized. The method of designing deck edge distance is proposed.3. The cause that track angle can not follow attitude angle of carrier-based aircraft withoutapproach power compensator system is anlysized. The mathematical model of longitudinalmotion of automatic landing carrier system is constructed. The chattering of discrete-time variable structure controller designed by exponent reaching law is studied. In order to reducethis chattering performance, an improved method about reaching law is presented. Theapproach power compensator system is designed by this exponent reaching law. Thelongitudinal motion simulation of automatic landing carrier system is set up in Matlab. Thecapability of approach power compensator system with the role of landing carrier disturbanceis analysized.4. The Mark7Mod3hydraulic damping arresting gear system is used to recover incomingaircrafts on an aircraft carrier. The control valve of constant runout is the heart of the Mark7system, and its opening is directly adjusted by the cam action. An approach of designing camprofile for the Mark7Mod3system is presented. Mathematical model of the Mark7Mod3system is built up, and the arresting simulation for carrier-based aircrafts with differentweights and different engaging speeds are carried out. The simulation results are analysized.The characterisics of arrestment for carrier-based aircraft are discussed. The technology ofdesigning pressure curve of main hydraulic cylinder is presented.