Finite Element Modeling And Safety Study Of Carrier-based Aircraft Arresting System

As a significant component to support the landing of carrier-based aircraft at sea,the arresting system is essential to protect and maintain the combat effectiveness of aircraft carrier.At present,most of the arresting equipment on the naval aircraft carrier is mostly based on steel rope with hydraulic system.When aircraft is in landing procedure,the tail hook hangs the arresting rope to pull it out,compressing the hydraulic components under the deck to make it output arresting force.Eventually,the aircraft will be stopped at a certain distance.In this process,the rope as well as the whole arresting system shows extremely complex dynamic characteristics,which makes this process extremely dangerous for both aircraft and ship.On the moment of hook and rope connecting,if some parameters beyond the safety range,major safety accidents may be caused,resulting in personal and property damage.Therefore,it is necessary to study the arresting system and the carrier-based aircraft arresting process in depth.Firstly,the dynamic performance of elastic arresting rope after being hit by tail hook is analyzed,and the transmission law of kink wave is studied.In order to simulate this performance,an arresting rope model consisting of the "spring-mass ball" structure is established by finite element method.Secondly,based on the Mark7Mod3 arresting system,according to hydromechanics,the dynamic models of the main engine pressure hydraulic cylinder,damper sheave gear,accumulator gear and cable anchor damper gear are established.Also,the control rule of constant runout valve was studied.Meanwhile,the dynamic and kinematic model of aircraft in the process of arresting is established.In view of possible safety issues,specific safety requirements in the arresting process of carrier-based aircraft are put forward,and various safety indicators that should be met are analyzed based on this.At the same time,in view of the restraint of the arresting force,the changing pattern of the arresting force is analyzed,and the improved profile design of cam in the constant runout valve were proposed.Finally,with the established model of the arresting system and aircraft,the combined simulation program is developed by Visual C++.Then the simulation with different sets of initial conditions were tested.The influence of several initial parameters on aircraft arresting process is analyzed.According to the safety index set,the initial conditions that should be met are determined.After the improved designs of cam get tested,the effect of change of cam profile on the arresting process is analyzed,and the improvement of the arresting characteristics of certain designs are verified.