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基于动态称重(WIM)系统的监测数据,统计分析了大于55 t重车的车重、车间距、轴重及车头时间间隔等特征参数的概率分布,推导出京沪高速(沂淮段)重车疲劳荷载谱和标准疲劳车模型.此外,建立了分车道和不分车道的疲劳荷载谱和标准疲劳车模型,且标准疲劳车总重远大于规范值.结果表明,京沪高速(沂淮段)日均重车达3 657辆,重载运输特征明显,车重服从广义极值分布,车间距服从伽马分布,轴重及轴间距服从混合高斯分布,车头时间间隔服从对数正态分布.建立的重车疲劳荷载谱和等效标准疲劳车模型可供实桥疲劳评估参考. 相似文献
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雷达回波信号的仿真是雷达模拟器模拟显示的基础。提出并构建了"扫描数据表"和"扫描地图数据表"及基于它们和电子海图高程信息的雷达回波信号模拟算法,实现了雷达回波信号的模拟,仿真了电磁波遮挡效应和雷达波束角宽度对雷达回波信号的影响。此方法运用于某型雷达模拟器的雷达回波信号仿真,通过普通PC计算机仿真显示,验证了此方法的有效性。Abstract: The emulation of radar echo-signal is the base of radar simulation display.Scan Data Table and Scan Map Data Table were proposed and then come to be established.On the basis of them and the elevation information of electronic sea chart,a radar echo-signal emulation algorithm was given.Then,the radar echo signal was simulated successfully,the blocking effects of electromagnetic waves and the effects of radar beam on radar echo signals could be emulated.These tables and the method involved have been applied for emulating the radar echo signals of one radar simulator,whose effectiveness has also been indeed proved in the way of conventional PC computer emulation. 相似文献
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