横梁接头形式优化在白车身性能提升上的应用

发布时间：2018-04-11 05:07

  本文选题：白车身 + 有限元模型　； 参考：《湖南大学》2016年硕士论文

【摘要】：随着科学技术的进步和人们节能环保意识的提高,汽车正朝着安全、舒适、节能、环保等方向发展。对汽车本身结构的最优化设计是提高汽车性能、实现节能减排的有效措施。汽车接头作为车身结构的关键过渡区域和主要传力部件,其结构直接决定了车身的扭转刚度、弯曲刚度和振动模态等性能。对汽车接头进行详细的研究,有利于提高车身质量,为设计人员提供参考依据,具有重要的理论价值和实际意义。针对目前对于汽车接头的研究多数放在车身主要接头上,关于横梁接头的研究较少这一实际情况,本文深入探究了横梁接头形式对车身刚度性能的影响。主要研究结果如下：(1)建立了基于HyperWorks的商用车白车身有限元模型,对该模型进行了弯曲刚度和扭转刚度分析,得到了车身变形情况以及刚度值。相应地,对实际样车进行了刚度试验,对比分析仿真结果与试验结果,验证了有限元模型的合理性与可靠性。(2)基于灵敏度分析理论,以车身总质量为目标函数,车身扭转刚度、弯曲刚度为约束条件,进行了车身性能对板厚的灵敏度分析,并获得了关重模块如覆盖件、纵梁、横梁、B柱等对白车身弯扭刚度的贡献比。发现横梁模块对扭转刚度的贡献明显偏低,仅为0.79%。(3)研究了不同横梁接头形式对车身刚度性能的影响,对接头进行了优化设计。结果表明采用分段式接头时白车身刚度性能最好,接头优化后横梁模块的扭转刚度贡献比得到了明显的提升,达到4.68%。通过对某相近车型进行优化设计,表明了改进横梁接头形式是提升车身刚度和实现轻量化的有效途径。
[Abstract]:With the progress of science and technology and the improvement of people's awareness of energy saving and environmental protection, cars are developing towards safety, comfort, energy saving and environmental protection.The optimization design of automobile structure is an effective measure to improve the performance of automobile and realize energy saving and emission reduction.As the key transition region and the main force transfer component of the body structure, the structure of the joint directly determines the torsional stiffness, bending stiffness and vibration mode of the body.The detailed research on automobile joint is beneficial to improve the body quality and provide reference for designers. It has important theoretical value and practical significance.In view of the fact that most of the researches on automobile joints are on the main body joints and there is less research on the cross beam joints, the effect of the cross beam joints on the stiffness performance of the body is deeply investigated in this paper.The main results are as follows: (1) the finite element model of commercial vehicle white body based on HyperWorks is established. The bending stiffness and torsional stiffness of the model are analyzed and the deformation and stiffness of the body are obtained.Accordingly, the stiffness test of the actual prototype vehicle is carried out. By comparing the simulation results with the test results, the rationality and reliability of the finite element model are verified. Based on the sensitivity analysis theory, the torsional stiffness of the vehicle body is determined by taking the total mass of the body as the objective function.The bending stiffness is taken as the constraint condition, and the sensitivity analysis of the body performance to the plate thickness is carried out, and the contribution ratio of the closing weight modules such as the panel, the longitudinal beam and the B column to the bending and torsional stiffness of the body is obtained.It is found that the contribution of beam module to torsional stiffness is obviously low, which is only 0.79. 3) the influence of different beam joint forms on the stiffness performance of the body is studied, and the optimization design of the joint is carried out.The results show that the stiffness performance of the BIW is the best when the segmented joints are adopted, and the contribution ratio of torsional stiffness of the beam module after the optimization of the joints is obviously increased to 4.68%.By optimizing the design of a similar type of vehicle, it is shown that improving the form of cross beam joint is an effective way to enhance the body stiffness and achieve lightweight.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.82
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本文编号：1734539