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Road restraint systems are roadside structures that include safety barriers, crash cushions, terminal of barriers, the transitions among different road restraint systems, motorcyclist protection devices, etc. These systems are used to protect vehicle occupants from dangerous roadside elements and are a key issue in roadside safety. 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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A new,non-canonical Poisson regression model for the prediction of crashes on low-volume rural roads
The purpose of the study was to compare the prediction power of a simplified non-canonical Poisson crash-prediction model to other model types. The model, fitted to serious and fatal crash data from 86 two-lane low-volume rural highway segments, showed a good fit, which was not significantly different from that of a negative binomial model. The application of the present model uses the linear form of the non-canonical Poisson model. Hence the simplification of the model versus other models results from the finding that the expected number of crashes per 1 km is directly proportional to the daily volume, unlike logarithmic functions in other models. In the non-canonical model, it is necessary to estimate only one parameter, whereas estimations of more parameters are needed in the negative binomial model. 相似文献
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薄壁直梁件碰撞性能计算机仿真方法的研究 总被引:23,自引:4,他引:23
本语文通过壁直梁件的碰撞仿真研究,对碰撞仿真的技术细节进行了深入的研究,分析了网格密度,车身用低碳钢材料塑性选场生随应变率的变化及焊点力学特性因素对仿真结果的影响。 相似文献
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车身碰撞盒的回弹试验研究 总被引:1,自引:0,他引:1
选择压边力、板料初始尺寸、润滑条件作为试验参数对U形车身碰撞盒进行了冲压成形生产试验,测取了三维空间各点的回弹值。结合试验结果,对影响回弹的因素进行了分析讨论。试验结果表明:回弹随着压边力增大而减小;在一次成形中,试件弯曲的点数影响回弹角的大小。 相似文献
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