新型機械彈性車輪的結(jié)構(gòu)強度分析與疲勞壽命預(yù)測
[Abstract]:Tire is an important safety component in vehicle driving system, and its structure and performance have an important influence on the safety of the whole vehicle. In this paper, the structural strength and fatigue life of a new type of mechanoelastic safety wheel are studied, and the influence of structure and dimension on its fatigue life is also discussed. It provides an important reference for the design optimization and application of mechanical elastic wheels. (1) the structure and bearing mode of mechanical elastic wheels are introduced, and their geometric models are established in the 3D modeling software PROE. The finite element mesh generation and material attribute setting are processed by ANSYS software. The finite element simulation calculation of radial loading of mechanical elastic wheel frame is carried out, and the correctness of the established model is verified by comparing the simulation results with the experimental results. (2) based on the wheel dynamic bending fatigue test, The finite element model of fatigue test is established. The cyclic process of wheel skeleton load is simulated by sine load and cosine load with the same amplitude and frequency, and the fatigue life is predicted based on Miner's linear fatigue cumulative damage theory. The analysis shows that the fatigue failure of the wheel skeleton is mainly focused on the connection between the elastic ring combination card and the hinge group, and for the 12 sets of wheels with hinged structure, The minimum fatigue life is 403000. (3) the factors influencing the fatigue life of mechanical elastic wheel are studied. The results show that with the number of hinge groups, the fatigue life of hinge group increases non-linear with the increase of cross-sectional area of hinge group, and decreases with the increase of actual load. Twelve groups of wheels with hinged structure are selected. The design variables are hub thickness and hinge group thickness, and the minimum weight and maximum fatigue life of mechanical elastic wheels are the design objectives. The optimum design was carried out by using sample screening method and multi-objective genetic algorithm respectively. The fatigue life value of mechanical elastic wheels was increased by 48.5% and the weight increased by 4.1% after optimization.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U463.34
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