环放路网宏观基本图信号周期敏感性分析

Sensitivity Analysis of MFD of Ring Radial Road Network on Signal Cycle

为揭示路网宏观基本图(MFD)对信号周期的敏感性,首先,提出一种基于GMM的宏观基本图建模方法,并在此基础上提出路网运行效率和稳定性的表征方法;其次,提出MFD对信号周期敏感性的仿真实验设计方法;再次,以环放路网为例,进行仿真实验,分析信号周期的变化对MFD的影响,进一步揭示信号周期对路网运行效率和稳定性的影响机理.结果表明,合理的信号周期对MFD和路网的效率及稳定性影响不大,但周期过大或过小则对MFD和路网的运行效率及稳定性造成较大影响.该结论可以为路网交通控制和优化提供依据.

To reveal the sensitivity of macroscopic fundamental diagram (MFD) of road network on signal cycle, this paper firstly proposed an MFD modelling method based on GMM, and then proposed a characterization method of road network operation efficiency and stability. Secondly, a simulation experimental design method for sensitivity of MFD on signal cycle was proposed. Thirdly, taking the ring radial road network as example, a simulation experiment was carried out to analyze the influence of signal cycle on MFD and further, the influence mechanism of signal cycle on road network operation efficiency and stability was revealed. The results indicate that the MFDs efficiency and stability of road network are less affected by reasonable signal cycle length, but are more affected by too large or too small cycle length. This conclusion provides a basis for road network traffic control and optimization.