某商用车车架结构有限元分析及试验研究

发布时间：2018-04-28 08:26

本文选题：车架 + 有限元分析　；参考：《重庆大学》2016年硕士论文

【摘要】：车架作为整车中的核心部分,承受和传递着道路和装载的各种复杂载荷,并且汽车上许多重要总成都是以车架为载体,其性能的好坏直接关系到整车性能的好坏。车架破坏的形式有强度破坏和耐久性破坏。本文以某商用车车架结构作为主要研究对象,结合工程理论和实际,从静态特性和疲劳特性两个方面对商用车车架的可靠性及耐久性进行了评估,并完成了对车架结构零部件的疲劳寿命改进设计,为企业实际生产提供参考依据和数据积累。本文的主要研究内容及成果如下:(1)采用HyperMesh有限元软件建立了商用车车架结构计算模型,分别对车架结构弯曲、扭转两种典型工况的车架静态强度、刚度进行了计算和分析,预测车架结构应力及变形情况,仿真结果表明车架结构强度、刚度满足设计要求;(2)开展了对车架结构的台架试验,车架的弯曲刚度为86.47KN/mm;三种车架形式的扭转刚度差别甚微,均在5000N*m/°左右。同时与有限元仿真模型的强度、刚度结果进行对比,验证了有限元分析模型的正确性和计算结果的可靠性,并讨论分析了试验与仿真偏差的原因;(3)开展了车架扭转疲劳台架试验,并根据试验进行了疲劳寿命预测仿真分析,对比分析验证了疲劳寿命分析的可靠性,并对台架试验中断裂的零部件进行改进设计,改进后的横梁连接板在50万次循环后累积损伤为原始结构的1/3,平衡轴贯通梁改进后的累积损伤为原始的1/11。
[Abstract]:As the core part of the whole vehicle, the frame bears and conveys various complex loads on the road and loads, and many important assemblies on the vehicle take the frame as the carrier, and its performance is directly related to the performance of the whole vehicle. The form of frame failure is strength failure and durability damage. In this paper, the reliability and durability of a commercial vehicle frame are evaluated from two aspects: static characteristics and fatigue characteristics, taking the frame structure of a commercial vehicle as the main research object, combining with engineering theory and practice, and evaluating the reliability and durability of the frame from two aspects: static characteristics and fatigue characteristics. The improved design of fatigue life of frame structural parts is completed, which provides reference basis and data accumulation for actual production. The main contents and results of this paper are as follows: (1) the calculation model of commercial vehicle frame structure is established by using HyperMesh finite element software. The static strength and stiffness of frame structure under two typical working conditions, bending and torsion, are calculated and analyzed respectively. The simulation results show that the strength and stiffness of the frame structure meet the design requirements. The bench test of the frame structure is carried out. The bending stiffness of the frame is 86.47 KN / mm, and the torsional stiffness of the three kinds of frame forms has little difference. All of them were about 5000N*m/ 掳. At the same time, compared with the results of strength and stiffness of the finite element simulation model, the correctness of the finite element analysis model and the reliability of the calculation results are verified. The reason of the deviation between test and simulation is discussed and analyzed. (3) the torsional fatigue bench test of frame is carried out, and the simulation analysis of fatigue life prediction is carried out according to the test. The reliability of fatigue life analysis is verified by contrast analysis. After 500000 cycles, the cumulative damage of the improved cross beam connection plate is 1 / 3 of the original structure, and the accumulated damage of the improved balance shaft through beam is 1 / 11 of the original one.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.32

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