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摘要: 在分析交通工程软件系统现状的基础上, 给出了基于GIS (地理信息系统) 平台的交通工程CAE (计算机辅助工程) 软件系统的设计方案, 对系统设计中的关键技术进行了分析, 采用数值逼近理论分析交通数据, 并以智能化图形方式显示结果。实例中通过对交通特性中行车速度的分析与处理, 证明了该系统整体方案及交通数据组织与拟合算法的可行性。Abstract: Based on the analysis of the current development of traffic engineering software system, the traffic engineering CAE (computer-aided engineering) systematic designing program based on GIS (geological information system) was presented, and the key technology of the design was also given. The process and analysis of traffic data were made with numerical analyzing theory, and its results were expressed in intelligent model. The system is proved to be feasible by analyzing and dealing with vehicle speed in traffic properties.
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Key words:
- traffic engineering /
- CAE /
- GIS /
- numerical approximation /
- B-spline functions
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表 1 地点速度数据
Table 1. Position speed data
速度范围/km·h-1 中位速度Vi 观测车辆数及频率 累积观测车辆数及累积频率 次数 频率/% 次数 频率/% 55.5~58.5 57 3 1.5 3 1.5 58.5~61.5 60 9 4.5 12 6.0 61.5~64.5 63 16 8.0 28 14.0 64.5~67.5 66 43 21.5 71 35.5 67.5~70.5 69 50 25.0 121 60.5 70.5~73.5 72 40 20.0 161 80.5 73.5~76.5 75 20 10.0 181 90.5 76.5~79.5 78 12 6.0 193 96.5 79.5~82.5 81 6 3.0 199 99.5 82.5~85.5 84 1 0.5 200 100.0 表 2 速度频率误差
Table 2. Error of speed frequency
i 1 2 3 4 5 6 7 8 9 10 xi (中位速度) 57 60 63 66 69 72 75 78 81 84 yi (频率) 1.5 4.5 10.0 20.5 22.5 20.0 11.0 6.0 3.0 1.0 fi (拟合后频率) 1.500 4.501 10.037 20.492 22.487 19.990 11.003 6.004 3.001 1.000 -
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