本文選題：交通工程 + 交通流��； 參考：《長安大學(xué)學(xué)報(自然科學(xué)版)》2015年02期

【摘要】：針對應(yīng)急車輛通行時交通流參數(shù)難以實時獲取的問題,提出以仿真手段模擬交通運行,進(jìn)而探討隨機交通條件下應(yīng)急車輛行程時間的計算。在分析有應(yīng)急車輛的混合交通流運行特性的基礎(chǔ)上,增加車輛類型,引入應(yīng)急車輛影響區(qū)域和普通車輛讓行概率2個參數(shù),修改車輛換道與速度更新規(guī)則,建立了雙車道交通流元胞自動機模型。利用MATLAB進(jìn)行數(shù)值模擬,生成不同交通密度條件下的應(yīng)急車輛行程時間,并與現(xiàn)有計算公式進(jìn)行對比分析。研究結(jié)果表明:應(yīng)急車輛僅干擾其所處位置的車流運行,對雙車道總體流量沒有影響,在密度位于0.12~0.36范圍內(nèi)優(yōu)先通行效果較好;在密度較小(≤0.08)或較大(≥0.24)時,應(yīng)急車輛行程時間隨著行駛距離的增加呈現(xiàn)近似正比例的增加,且密度越大,增長的斜率越大。研究發(fā)現(xiàn)現(xiàn)有針對應(yīng)急車輛的距離-行程時間函數(shù)適用于低密度及高密度交通條件,而在0.12~0.20密度范圍內(nèi)失去效用。
[Abstract]:In order to solve the problem that traffic flow parameters are difficult to obtain in real time when emergency vehicles pass, a simulation method is proposed to simulate the traffic operation, and then the calculation of the travel time of emergency vehicles under random traffic conditions is discussed. On the basis of analyzing the operation characteristics of mixed traffic flow with emergency vehicles, the vehicle types are added, and two parameters, namely, the influence area of emergency vehicles and the probability of passing of ordinary vehicles, are introduced to modify the rules of changing lanes and updating speed of vehicles. The cellular automata model of two-lane traffic flow is established. The MATLAB is used to simulate the emergency vehicle travel time under different traffic density, and the results are compared with the existing formulas. The results show that the emergency vehicle only interferes with the traffic flow in its position and has no effect on the overall flow of the two lanes, and the priority traffic effect is better when the density is within 0.120.36, and when the density is lower (鈮，

本文編號：1789155