| Landing gear is an important component of aircraft, and also a key research object in aviation field. As the strength of landing gear relates to the safety of aircraft, strength analysis on landing gear has a very significant engineering significance.With high efficiency and reliability, technology of Finite Element Simulation promotes the design and development of landing gear.Based on finite element software ANSYS, a structural strength analysis of the main part of landing gear is carried out under several dangerous working conditions in this thesis. As the landing gear system is very complex and it’s hard to make an analysis on the overall structure, the landing gear bearing and wheel hub is chose to be the research object.First, the finite element model for main landing gear bearing and wheel hub is established based on parametric modeling method and the criteria of finite-element modelling. According to actual condition, the method for applying constraints and loads on the model is gave, which truly reflects the actual force situation of landing gear. Contact pair is established to simulate the contact action between outer tub and piston rod of shock strut, and the contact stiffness of the model with stable contact force is identified by analyzing the effects of normal contact stiffness on stress of contact surface. A numerical simulation is carried out on the landing gear using the parametric finite element model obtained before, with which the stress distribution of the bearing and wheel hub is obtained under four different kinds of dangerous working condition, and the location of dangerous point is find out. Then, the section stress of the piston rod is calculated adopting the theory of classical mechanics formula, which verifies the correctness of simulation results. Furthermore, the optimal design for landing gear components is conducted without affecting its structural strength, and the aim of weight reducing is achieved. |
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