OV 模型交通流阻尼特性研究

对交通流跟驰模型施以拉氏变换（或z 变换），转换为控制系统传递函数形式， 进而通过分析传递函数来探讨交通流系统稳定性及控制方法，这是交通流稳定性理论研 究重要方向之一.为进一步挖掘分析稳定交通流系统在稳定状态下动态特性，基于最优速 度跟驰模型，以控制理论时域分析方法，研究了交通流系统在欠阻尼和过阻尼两种情况 下阶跃响应动态特性，并以仿真算例验证了理论正确性.过阻尼较欠阻尼交通流系统稳定 性好，但调节时间更长，若将交通事件抽象为阶跃响应，通过分析交通流系统调节时间、 超调量等参数，可为计算交通事件持续时间作参考，进而制定合理有效的交通管理措施.

Traffic Flow System Damping Ratio Characteristics Analysis Based on OV Model

Investigating traffic flow system’s stability by converting traffic car- following model is an crucial way to control system transfer function through Laplace transformation or z transformation. The traffic flow system stability problem is transformed to the control system stability problem. On further consideration, steady control system has different dynamical properties under different damped ratios. To investigate the characteristics of steady traffic flow system, with optimal velocity model, this paper studies its step response dynamical performance index of underdamped and overdamped conditions based on control theory time-domain analysis method. The simulation results show that the overdamped ratio system is more stable than underdamped ratio system, but has longer settling time than the latter. As far as traffic flow system is concerned, step response can be regarded as the model of some kind unexpected traffic incident, therefore such parameters as delay time, rise time, peak time and settling time can be used as reference time range for dealing with traffic events.