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摘要本论文主要研究汽车座椅横梁，对汽车座椅横梁进行有限元法的分析，主要采用对比分析法，对汽车座椅横梁的点、线、面施加不同的载荷，还有在不同的部位进行分析，得出在对汽车座椅横梁的点施加5000N载荷力时，变形最大，因为接触面积小，然后对汽车座椅横梁进行模态分析，分析固有频率，使汽车零件之间不会达到共振，从而减弱汽车座椅横梁的损坏性。然后对汽车座椅横梁进行相关优化，可以相应增加汽车座椅横梁零件的厚度，或者改变结构，是结构件的面连续，以达到更强的抗压性。我们也可以在支撑部位增加一个橡皮圈垫子，缓解振动产生的固有频率，更加有效的减小缓冲。有限元理论以及在汽车零件方面的应用都得到了飞快的发展。从二维问题提升到了三维问题、外形问题,从静力学方面的问题延伸到了动力学方面的问题还有稳定性方面的一些问题,还有一些则是由线性问题延伸到了非线性方面的问题。进行部分的优化，并且提高了有限元分析大型复杂汽车零件结构的效率,从而有效地降低优化汽车零件问题的规模,利用静态分析得出的结果成为汽车零件优化的边界条件,打破了在对普通汽车的车身和相应零件方面优化设计的局限,有效的解决了汽车的零件模型复杂以及计算工作量大的问题。并且实际应用价值可以通过汽车的结构件试验模态分析从而了解汽车的结构件结构系统的动态特性；然而对于汽车的结构件进行模态参数识别，分析得到了汽车的结构件的固有频率、阻尼系数以及振动形态。更加有利的对汽车的结构件进行结构分析加以优化设计。当你使用不同的模态分析方式时，也会有着不一样的识别精度，然而我国大部分对于汽车的结构件试验以及模态分析方法进行对比方面的研究也是相对较少的，我们应该提高有限元对汽车结构件的识别精度，让其更加有效，更加精准的了解汽车结构件的动态性能，也更加有利于优化汽车的结构件结构。76212

该论文有图98幅，参考文献25篇。

关键词：座椅横梁  结构件  模态分析  静力学

Strength analysis of structural parts

Abstract

In this thesis, we mainly study the automobile seat cross member, on the car seat beam for analysis of finite element method, comparative analysis method is mainly used for that point, line and surface of automobile seat cross member applying different load and in different parts of the analysis that in of automobile seat cross member points and 5000n load, maximum deformation, because of the small contact area and on crossbeam of automobile seat modal analysis is carried out natural frequency analysis, make between parts of a car will not achieve resonance, to lessen the damage of automobile seat cross member。 Then the relevant optimization of the beam of the automobile seat can increase the thickness of the beam part of the automobile seat, or change the structure, And the static and modal analysis of the car parts, to provide a valuable theoretical basis for the improvement of the design。 Dynamic analysis combined with the bearing the actual characteristics of car body, car body dynamic analysis Division for car body frame and a tire with a suspension of bispectrum analysis, are part of the optimization, and improve the efficiency of finite element analysis of large and complex auto parts structure, so as to effectively reduce optimization scale of automobile parts, using static analysis results become the auto parts optimization of boundary conditions, breaking the limitations of ordinary car body and the corresponding parts in optimization design of, effectively solve the parts of a car model complex and calculation workload。 The finite element analysis of the total, this paper studies the automobile parts is automobile body structure design of the major development, which has great theoretical significance and practical application value can be through the parts of a car test modal analysis to understand the car parts structure system's dynamic characteristics; however, for the parts of the car to identify the modal parameters are analyzed automobile parts of natural frequency and damping coefficient and the vibration of the form。 A more favorable structure analysis of the parts of the car to optimize the design。 For part structure of the damping is not the same as the car, when you use different modal analysis method, is not the same as the recognition accuracy, however our country most for automobile component test and modal analysis method of comparative research is relatively less, we should improve finite element auto parts recognition accuracy, make it more effective, more accurate understanding of automobile parts of dynamic performance, but also more conducive to optimization of automotive parts structure。 (责任编辑：qin)