Design And Simulation Of Carrier-Based Aircraft Ejection Mechanism

Carrier-based aircrafts need to take off from and land on the limited deck of carrier safely, while by the means of catapult launch aircrafts can take off in a shorter distance. Thus, a great deal of effort has been put into the research of ejection system in and abroad China. In this dissertation, for the purpose of urgent need of future carrier-based aircraft, the incorporation design of ejection mechanism and nose gear is accomplished, the dynamic analysis of ejection system is carried out to ensure the requirements on structural strength and functions. These works build a reliable basis for further investigation on ejection system. The main contents are as following:1. According to the design criteria for ejection mechanism, the feasible plan of kinetic mechanism is proposed. In order to realize the target of incorporation design, the structure details of nose gear ejection systems are studied. Subsequently, the mechanism is optimized to obtain better dynamic characteristic.2. Buffer design is researched based on nose gear extension technology. The combine extension mode is determined and the oleo-pneumatic buffer with two-stage chambers is improved for better take-off performance. The co-simulation of catapult launch and extension is realized utilizing dynamic simulation software LMS.Virtual.lab and mechanism/hydraulic simulation software AMESim. It is concluded through the results of simulation that, the combination of high pressure gas inflation and potential energy release is more effective; in addition, the improved buffer can actually save the time of extension.3. Nose gear ejection system is subjected to extreme complicated dynamic loads during the catapult launch process. The dynamic characteristics of the whole system are analyzed by adoption of Craig-Bampton method to validate the strength of system and the feasibility of proposed mechanism.