论文标题:混合交通流信号配时参数及优化方法研究
Research on Signal Timing Parameters and Optimization Methods of Mixed Traffic Flow
论文作者 姜景玲
论文导师 王殿海,论文学位 硕士,论文专业 交通信息工程及控制
论文单位 吉林大学,点击次数 157,论文页数 75页File Size646k
2005-05-01论文网 http://www.lw23.com/lunwen_6511287/ 混合交通;交叉口;换算系数;饱和流率;绿灯提前截至时间;周期时长;绿信比
Mixed Traffic; Intersection; Conversion Factor; Saturation Flow Rate; Green End Time in Advance; Cycle Length; Split
城市交通控制系统是提高城市交通运行效率的重要途径之一,也是城市交通现代化、智能化的重要标志。本论文分析了我国城市混合交通的普遍性,及国外控制系统对我国混合交通的不适应性,选择了混合交通控制系统的核心技术——信号配时参数优化及其所需基本参数的优化作为核心内容进行了细致深入的研究。对信号配时参数优化必需的换算系数和饱和流率进行了深入探讨:对机动车和自行车换算系数进行了重新测定,并给出了标定结果;对机动车饱和流率和自行车饱和流率的实测方法进行了详细分析。根据自行车相对于标准小汽车的换算系数和基于交通强度的机动车交通流的周期时长优化方法,建立了典型交叉口的周期时长优化模型。研究了交叉口关键相位的判定方法,建立了自行车的提前截止时间确定模型,给出了机动车交通流和自行车交通流的绿灯时间确定模型。本论文所标定的车辆换算系数可更好的应用与交通控制系统中,所建立的混合交通流周期时长和绿灯时长模型为混合交通流信号配时理论的进一步研究具有很好的实用和参考价值。
This dissertation chooses the key problem in urban traffic signal control—signal timing parameters and optimization methods—as its research target. This dissertation is consisted of introduction, measurement of vehicle conversion factor, measurement on the spot of saturation flow rate, optimization methods of signal timing parameters of mixed traffic, and conclusion and expectation. The contents are as follows. (1) The introduction introduces the background, actuality, meaning and main contents of this dissertation (2) Measurement of motor vehicle conversion factor. T The selection of standard vehicle is the precondition and basis for motor vehicle conversion factor analysis. Since cars maintain much large proportion in cities of China, the dissertation selects car as standard vehicle. The selection fits the criterion commonly domestically and internationally. Headway serves as the measurement of criterion for vehicle conversion factor in the paper. The reasons are as follows: ①Vehicle conversion factor is defined as the equivalent that non-standard vehicles contrast with standard vehicles in terms of spatio-temporal. When it comes to capacity analysis, conversion factor is used as equivalent that non-standard vehicles contrast with standard vehicles in terms of time. ②When non-standard vehicles are in the mixed traffic flow, it makes different effects on traffic flow in a free way of driving,velocity and delay, etc, contrast with standard vehicle. The impact is reflected from the headways when the drivers choose different following distance. So headway is the overall presentation of various vehicle types resulting in impact on traffic flow in all aspects. ③The factor resulting in impact on headway is composed of two parts, namely the gap between the rear of the front vehicle and the head of the following vehicle and the vehicle length. When other factors remain unchanged, the longer the vehicle length is, the longer the time that the vehicle holds actuated loop detectors is, accordingly, the longer headway is , and vice versa. So, headway is relative to vehicle length. ④In traffic control system,vehicle length and headway are the basic information that can be obtained by loop detectors, so if conversion factor measurement models are established in accordance with the data of vehicle length and headway, the models will be easily used in traffic control systems. ⑥Headway is the most evident parameter in traffic flow directly obtained from traffic survey. It is comparatively precise in computation without accumulative error. The difference of vehicle headways can be indicated only in case of saturation. Therefore, the traffic situation studied in the paper is of saturation state. The paper selects headway under saturation conditions as datum value. The vehicle conversion factor measurement method is established by studying the impact of standard and non-standard vehicles on the headways of standard vehicles. The vehicle conversion factor dealing with different vehicle length is calibrated by studying the impact of non-standard vehicles with various lengths on the headways of standard vehicles. Through traffic survey on nineteen lanes from nine inlets of six typical intersections in Changchun City during peak periods, vehicle conversion factor in accordance with the vehicle length is certain. (3) Measurement of bicycle conversion factor. Since mutual the influence of bicycle and motor vehicle is embodied in intersection with two phases, so bicycle (right bicycle and turn bicycle) conversion factors are studied bases on intersection with two phases. Measurement of right bicycle conversion factor. In the intersection with two phases, the traveling lines of right bicycles and right vehicles are parallel. Though right bicycles and right vehicles affect reciprocally, comprehensive flow of the right bicycles and the straight vehicles is a fixed value when there is no effect ofbicycles and vehicles traveling in other directions. Based on which, the measurement model of right bicycle is established. Through t
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