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With the increase of link rate, the arbitrator of centralized switch fabric becomes too complicated to implement. A parallel switch fabric based on crossbar, named as PSFBC (Parallel Switch Fabric Based on Crossbar), has been proposed in this paper. PSFBC is composed of k switches whose rate is 1/k of link, these switches exchange cells in parallel; this increases the arbitrator's period and make it easy to implement. Load is evenly distributed to each switch with FCFS (First Come First Serve) rule, it can keep the order of cells in one stream. A multi-class queue scheduling policy is used in PSFBC to ensure the quality of realtime streams. Experiments show that the load on each switch in PSFBC is well balanced, its average delay of cells is little and its performance is very close to centralized switch; and with the increase of number of parallel switches, the loss of PSFBC's performance keeps very small, it becomes easier to implement. 相似文献
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实践证明,当独立悬挂车辆的前轮侧滑量偏小或为零的时候,转向轮非正常磨损严重。基于这种原因,我们对240台独立悬挂车辆进行了检测试验,测试结果表明:在用双板式侧滑仪检测独立悬挂车辆前轮侧滑量时,不能单纯地观察仪表指示数值,而应该对检测结果做具体分析。 相似文献
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阐述燃油消耗对运输成本的意义,通过数字及曲线分析,应用汽车相关理论,提出在政策性措施、技术措施、结构措施及其驾驶因素等方面提高汽车燃料经济性的方法。 相似文献
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黑龙江省公路网规划的交通量分配 总被引:1,自引:0,他引:1
应用经济学和统计学理论,结合交通规划的理论建立数学模型,通过对人口、经济、公路客货运量预测及各节点发生量、吸引量预测和交通量分布预测,按照“四步骤”的方法逐步分析,通过检验、评价,最终实施全区交通量分配。 相似文献
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高速公路由于交通事件的发生导致正常交通流发生改变,为了消散车流拥挤或阻塞,减少排队延误,应采取一定干预措施。运用流体力学车流波理论,分析了交通事件和干预措施综作用下对车流状态的影响,建立了关于车速与交通密度线性模型下的车流波波速模型,这些模型为有效确定事件处理方案,尽快消除拥挤或阻塞提供了理论依据。 相似文献