The Analysis Of Aircraft Arrested Landing Under The Motion Of Aircraft Carrier

Aircraft carrier has a developing history of more than80years. Aircraft carrier andcarrier-based airplane have become a key factor of winning especially in recent years’ severalmodern local wars. In its various stages of flight, the aircraft is the main attack force. Thenoticeable characteristic of the aircraft is catapult-assisted take-off and arrested deck-landing,which are the main reason of most carrier aircraft’ accidents. When the carrier aircraft isarrested in the process of the deck-landing, the serious dynamic loadings which affect thepilots and aircrafts’ safety on the aircraft will occur. Landing safety is the most difficulttask.The landing environment of the carrier-based airplane is very tough, because limitedlanding spaces and deck motion together with the airwake disturbance factors have a badeffect on the safety of landing. The following aspects have been researched in detail:Firstly, in the present thesis, the motions of the aircraft carrier in regular waves andirregular long-crest waves are investigated by time-domain means. On the base of STFtheory,the non-linear equations of aircraft carrier motions in waves are established bycoupling the heave, roll and pitch motions.The wave-disturbance forces and the metacentricheight fluctuation in the irregular long-crested waves are simulated by the method of linearsuperposition. Based on the theoretical model, computational software is developed and anexample is selected for the following problem. The effects of wave height, wave length,aircraft carrier speed and the relation between wave frequency and aircraft carrier naturefrequency on moving in the regular waves are discussed. When the aircraft carrier is moving,the displacement、velocities and accelerations of the three conditions(the heave, roll andpitch) at specified locations are analysed.Secondly, after the carrier aircraft contacts the cable,the loading state will be the mostcomplex and the mathematical model of carrier aircraft is the most complex too. The model isdiveded into two independent parts which constitute the mathematical model of the carrieraircraft and the arresting system. Two parts are connected by the point of the arresting hook ofcarrier aircraft that engages arresting cable.A new mathematical model is the base to analysethe dynamic response of the arrested-landing aircraft. The thesis takes the MK7-3arrestinggear system as example, considering the dynamic response of the arrested-landing aircraft (symmetrical or unsymmetrical). Simulation values are compared with the data and curves ofmilitary standard2066and the mathematical model is validated. The results of simulationindicate that the arresting-force loads are decided by the weight of aircraft, the engagingvelocity and the arresting system and so on.Thirdly, on the analysis of the arresting system，The thesis proposes the fimite elementmodel of the arresting cable through widely relative theory, applying cubic multinomial todisplacement function and deducing the expression of the form function and the geometricalrelation of elements on Lagrangian axis. Then the element equation and unit tangent rigidmatrix are deducted on the basis of description of UL coordiate and the principle of virtualwork. The balance equation and the overall tangent rigid matrix are integrated. Furthermore,by using the certain code of ANSYS, The arresting cable is simulated with three dimensionlink element Link10and contact element.The results which are compared with the images ofthe strain and stress in the documents are true.Finally, The visible simulation of the aircraft landing is based on the characteristics ofreal-time and interaction. The thesis designs the system target and function, analyzing thetechnology course, providing the system frame and confirming the development environmentswith MultiGen Creator/Vega Prime. The thesis analyzes3D model and environments insystem and induces the blue print,based on the principle of3D modeling and establishing3Dmodel of the system and environments module with MultiGen Creator/Vega Prime, such asthe aircraft carrier module, the aircraft module, the collision module.Based on Visual Studio,scene simulation system demonstrates the process of aircraft landing.In conclusion, the analysis of aircraft arrested landing under the motion of the aircraftcarrier have been studied systematically and it will provide useful references to practicalengineering problems.