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The relationship between the opposing left-turn conflict and the traffic participants was analyzed in this study. Based on the traffic conflict technology, the image data were collected in a real traffic situation. The relationship was investigated under two different conditions. The number of opposing left-turn conflicts was positively correlated with the number of left-turn vehicles while the ratio of left-turn vehicles to opposing vehicles was less than 1, and showed a positive correlation with the number of opposing-through vehicles when the ratio of left-turn vehicles to opposing vehicles was more than 1. In other words, the opposing left-turn risk was positively correlated with the number of the minor traffic participants, which had a negative effect on the whole traffic system operation. 相似文献
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Mixed traffic consisting of cars and bicycles is a typical pattern of urban traffic in China.To study the impact of bicycles on traffic performance,a microscopic simulating model based on the principle of cautious driving and collision free was proposed.The interaction between cars and bicycles were described by lateral friction and overlapping driving.The dynamical features of speed and time-headway were investigated by numerical simulations.The results show that bicycles have a significant impact on travel speed and time-headway.The effect of bicycles can cause different results in the free flow phase and congestion phase respectively.The results also indicate the necessity to mitigate the interaction between motorized vehicles and non-motorized vehicles. 相似文献
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在定量识别多次致命性故障状态的基础上,通过对发生致命性故障事件和修复事件的描述,提出了复杂可修系统可信度计算的一般方法,同时详细地推导致命性故障和任务修复率为常数时复杂可修系统可信度的计算公式,并且展开讨论了发生多次致命性故障时复杂可修系统可信度的建模问题:最后以实例进行了可信度建模的工程化验证。 相似文献
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通过建立的驾驶行为形成模型 ,推导出描述驾驶行为动态特征的可靠性表达式 ;然后 ,结合驾驶可靠性计算公式和驾驶行为形成因子的计算机仿真 ,提出了评价驾驶失误对驾驶员车辆系统动态性能影响的方法 .根据对驾驶员车辆系统中驾驶失误的分析得出 ,感知可靠度的变化增大了交通事故发生的可能性 相似文献
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Sb变质对ZL107合金组织与性能的影响 总被引:1,自引:1,他引:0
ZL107合金经Sb变质后,能有效地使共晶Si由板条状变为粒状与孤块状,使α-Al枝晶分布均匀,并使棒状Al2Cu向小颗粒状转化.加入0.20%的Sb变质时,合金组织最为均匀,力学性能也最好.Sb进入合金后,吸附在Si的表面,阻碍了共晶Si的生长,使共晶Si片厚度的增加受到了抑制,AlSb质点的增多为α-Al形提供支撑,使口α-Al枝晶变得发达,分布均匀.经过T6处理后,合金的组织和力学性能得到进一步改善提高. 相似文献
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采用正交表L9(34)设计高速钢轧辊淬火后的回火工艺;经XRD分析,采用K值法定量测量不同热处理工艺下高速钢轧辊中残余奥氏体和碳化物的含量;通过方差分析确定残余奥氏体最少和硬度达到HRC71以上的最优热处理工艺. 相似文献
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The rapid development of the social economy strongly promotes the urbanization and motorization.Meanwhile,parking problems become serious due to the long-term imbalance between parking demands and facility constructions.Thus there is an increasing urgency in finding solutions for parking problems.Based on the methodology framework of geographic information system(GIS),the metropolis parking problems are discussed in this paper.The characteristics of parking demand and the reasons for parking problems are investigated in detail.Then,the basic parking principle and strategies for solving parking problems are suggested with the example of Beijing.The results are hoped to improve the parking environment in metropolis. 相似文献
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基于Windows CE.net的车载平台的定制开发 总被引:1,自引:0,他引:1
随着Windows CE在车辆终端中的广泛应用,如何根据具体的软硬件环境定制操作系统就成为非常重要的问题。文中主要介绍利用Platform Builder定制Windows CE.net的步骤,以及针对具体的硬件如何使定制的操作系统能够满足硬件的要求,同时介绍了定制过程中需要注意的问题,并且此平台已经应用于实际的作业机械中,取得了良好的试验效果。 相似文献