共查询到19条相似文献,搜索用时 281 毫秒
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提出了一种新的碰撞优化方法,即将试验设计(DOE)、有限元分析(FEA)、响应面法(RSM)和遗传算法(GA)结合起来,对S形薄壁梁多结构参数进行抗撞性优化设计.通过提取实际车架上使用的S梁特征参数,建立了S梁的碰撞模型.运用方差分析(ANOVA),选取那些对S梁吸能特性影响显著的因素作为主要设计变量,采用显式非线性有限元软件PAM-CRASH进行碰撞模拟.根据有限元分析结果并结合响应面理论,建立了S梁的总吸能和最大冲击载荷的响应面模型.采用遗传算法进行优化求解,得到了S梁的最优设计参数.优化后的S梁在碰撞中的总吸能能力大大提高. 相似文献
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《中国公路学报》2017,(7)
为进一步提高多胞薄壁结构在轴向载荷条件下的耐撞性能,提出了一种新颖的变截面多胞薄壁结构,该结构通过将传统均匀多胞结构内胞壁旋转一定的角度而形成,使得同一截面上的各胞元呈现非均匀特性。结合试验与数值有限元分析方法,以最大峰值力和比吸能为耐撞性评价指标,开展不同截面旋转轴位置、旋转角度和薄壁厚度等参数下的变截面多胞与均匀多胞结构的耐撞性对比研究。此外,为进一步探索变截面多胞结构的最优耐撞性,结合Kriging近似模型技术与多目标粒子群方法对变截面多胞结构进行了耐撞性寻优,获得了该结构的Pareto前沿与在不同设计要求下的最优参数匹配。研究结果表明:旋转轴位置、旋转角度和薄壁厚度对变截面多胞薄壁结构的比吸能有显著影响,但旋转轴位置和旋转角度对最大峰值力的影响较小,变截面多胞薄壁结构的比吸能较传统均匀多胞结构提高了约8%;当碰撞最大峰值力限定在180kN范围内时,该结构的最优设计参数壁厚t与旋转角度θ分别为1.52mm和1.85°。 相似文献
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为提供汽车不同区域的吸能特性与薄壁金属结构匹配的理论依据,一方面应用正交设计理论得到多参数影响下最优吸能特性的薄壁结构水平组合。建立了比吸能与试验参数的二次非线性回归方程并进行了比吸能预测值与试验值的比较,得到理想结果;另一方面,通过不同结构碰撞峰值力与加速度比较,完善了汽车不同区域耐撞性要求下薄壁吸能评价体系。 相似文献
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为提高汽车吸能盒结构耐撞性,受毛竹微观结构启发,提出3种不同的仿生双菱形肋边多胞薄壁结构。建立仿生双菱形肋边多胞薄壁结构的有限元模型,通过有限元仿真对比研究仿生双菱形肋边多胞薄壁结构与传统八边形多胞薄壁结构的耐撞性。分析双菱形肋边布置方式、内层壁厚等因素对新型薄壁结构吸能特性和变形模式的影响。结果表明,与传统八边形多胞薄壁结构相比,仿生双菱形肋边多胞薄壁结构的吸能特性有了明显的提升;双菱形肋边布置方式和内外层壁厚对结构吸能特性均有一定影响;随着内层壁厚的增加,结构最大峰值力减小,但总能量吸收和比吸能减少,载荷平稳度降低。仿生双菱形肋边多胞薄壁结构能有效降低乘员在汽车正面碰撞中所受的伤害,可应用到新能源汽车吸能盒的设计开发中。 相似文献
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Zhang Xiaoyun Jin Xianlong Qi Wenguo Guo Yizhi Li Genguo 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2007,45(11):1051-1064
The research presented in the paper deals with explicit nonlinear finite element calculation with domain decomposition for vehicle crashworthiness simulation. This is very important for vehicle design. Parallel computing is an efficient solution method to speedup and enhance the solving ability of large-scale numerical simulation. In this paper, a cost-effective domain decomposition method based on contact balance is presented, and the algorithm flowchart including contact computing is provided, and the parallel computing process and communication overhead are analyzed. Furthermore, scalability of the parallel computing method on different hardware platforms, the SGI Onyx 3800 and the ShenWei cluster, is studied. Finally, the effect of different domain decomposition strategy on vehicle crashworthiness simulation computing efficiency is presented. To end users, the research results should provide a reference for vehicle design and choosing appropriate hardware platform and computing software. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1051-1064
The research presented in the paper deals with explicit nonlinear finite element calculation with domain decomposition for vehicle crashworthiness simulation. This is very important for vehicle design. Parallel computing is an efficient solution method to speedup and enhance the solving ability of large-scale numerical simulation. In this paper, a cost-effective domain decomposition method based on contact balance is presented, and the algorithm flowchart including contact computing is provided, and the parallel computing process and communication overhead are analyzed. Furthermore, scalability of the parallel computing method on different hardware platforms, the SGI Onyx 3800 and the ShenWei cluster, is studied. Finally, the effect of different domain decomposition strategy on vehicle crashworthiness simulation computing efficiency is presented. To end users, the research results should provide a reference for vehicle design and choosing appropriate hardware platform and computing software. 相似文献
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S. H. Yoo N. T. Jeong K. S. Kim S. M. Yang J. H. Lee S. H. Choi M. W. Suh 《International Journal of Automotive Technology》2016,17(4):681-687
The use of plastic in vehicle development has increased. In particular, a design trend has resulted in chromiumplated plastics being used in exterior panels. Recently, as the appearance has become more important in design, the plastic radiator grille has become larger, to where it can become the primary member when a front collision happens. The radiator grille should be designed with considerations of the geometric structure, such as delamination, and material characteristics, when plastics are plated with chromium. The enlarged grille has to pass regulations like FMVSS Part 581. Although the material property of plastic has been studied before, what seems to be lacking is study on the crashworthiness of plastic radiator grilles that are plated using chromium. In this paper, in order to evaluate the crashworthiness, tensile test and front collision analysis using finite element method are performed. Tensile test is conducted with 4 types of materials, and then material properties of chromium-plated plastics are obtained. Meanwhile radiator grille’s crashworthiness is evaluated using finite element analysis method. Analysis result is evaluated according to failure criterion. Through this study, method of the assessment of plastic radiator grille’s crashworthiness considered material properties of chromium plated plastics is proposed, and it can be predicted the delamination and the failure point of radiator grille at the design step. 相似文献
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应用有限元法研究车架结构的耐撞性 总被引:1,自引:0,他引:1
本文应用有限地对车辆正面碰撞过程中车架结构的大变形过程进行了计算机模拟。文中介绍了非线性有限元分析的基本方程,运用微机版DYNA3D软件,在合理简化的基础上,建立了车呆结构的有限元模型,通过计算机模拟,预测了车辆正碰过程中车架的变形位置和变形形式。针对存在的问题,对车架结构进行了改进设计。实车碰撞试验表明:改进后,车架结构的耐撞性有明显提高。 相似文献
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