共查询到19条相似文献，搜索用时 187 毫秒
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实施行人过街信号与交叉口信号的联动控制是优化交通运行情况、缓解城市交通堵塞问题、提高交通安全的重要手段。本文将对行人与机动车交通运行情况进行分析,研究信号的协调控制办法。 相似文献
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城市道路人行横道是除交叉口外的重要的交通冲突区域,协调人行横道处的机动车流和行人过街等非机动车流的行为冲突具有重要意义。针对目前人行横道行人过街组织方式存在的弊端,采用基于行人过街请求的主辅灯信号联动控制策略控制人行横道交通行为。首先提出了主辅灯信号系统的辅灯控制方法原理;其次研究基于行人过街请求和主灯控制器信号配时的信号控制策略,实现满足行人过街请求前提下的车辆通行最优化控制方法;最后设计一种行人过节请求的辅灯控制器,通过设计相应功能模块,实现辅灯信号控制策略。模拟实验方案结果表明:在不同信号状态下触发行人过街请求信息,辅灯控制策略模型能够准确输出的辅灯信号的配时方案,在实施该信号控制策略后,车辆通过交叉口和辅灯人行横道区域的通行效率明显增加。 相似文献
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行人交通分析是对交叉口进行合理科学的规划、改造的重要前提和基础,而分析行人交通的基础是对行人交通特性进行分析。本文在整理大量的调查数据基础上分析了行人过街速度特性和行人违章的成因,对信号交叉口行人交通特性进了研究。 相似文献
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分析了洛阳交通方面的若干问题,包含交通繁忙地段行人过街问题、商业区停车场、公交优先以及停车场乱收费行为,提出了相应的解决办法。 相似文献
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文章力图以VR(虚拟现实)技术手段应用于城市地下步行商业街规划设计,来解决当前传统规划手段地下步行商业街规划中普遍存在的对其心理环境构筑的忽视和考虑不完善的诟病,以期最大限度消除规划设计中消极空间的产生,并对其关键技术进行了研究和探讨 相似文献
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《Journal of The Franklin Institute》2018,355(18):9053-9071
This paper studies the event-triggered model predictive control (MPC) of a stabilizable linear continuous-time system. The optimization problem associated with the proposed MPC strategy is formulated exploiting newly designed control constraints. Compared with the conventional tube-based MPC, where the constant tightened control constraints are employed, the proposed MPC strategy exploits the time-varying control constraints, which allows the control signal to take larger values in the beginning along the prediction horizon, resulting in potentially improved system performance. The re-computation of the control signal is triggered by the deviation of the predicted system state and the real system state. Furthermore, conditions are derived based on which the design parameters can be tuned to ensure the recursive feasibility of the optimization and the stability of the closed-loop system. Finally, the effectiveness of the proposed MPC strategy is verified using a numerical example. 相似文献
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为防止驾驶员注意力分散引起无法及时躲避行人造成的事故,利用嵌入式技术、视频跟踪、识别技术,进行行人的快速捕获、识别,建立并形成一个适合于城市交通的嵌入式车载行人检测系统。实验结果表明,本系统可以较为准确地检测行人、提出行车策略及行车建议,有效防止驾驶员误判断现象的出现,提高了行车安全性。 相似文献
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路灯是城市建设中重要的公用设施,是城市形象的重要标志。随着社会的不断发展,我国城市路灯照明系统随着城市的发展而不断扩大。由于路灯分布范围广,人工管理落后,造成路灯故障率高,路灯电缆被盗严重等问题日益突出,造成严重社会影响。传统的路灯照明系统的控制方式存在效率低、成本高、无法监控等问题,已经无法满足现代化城市的需要。因此,研制一套功能完备的路灯控制系统具有非常重要意义。文章描述的路灯控制装置能通过GSM通信的方式,远程控制路灯和实时上传电能参数,具有电缆防盗和故障路灯定位等功能。 相似文献
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Philip X. Rice 《Journal of The Franklin Institute》1932,213(4):381-399
This system of automatic train control employs an alternating magnetic Wheatstone bridge for receiving stop indications from inert track inductors, whereby air brakes of a train approaching a danger zone are operated to stop the train. The bridge is a reversible variocoupled transformer, and the inductor is a flux-reverser and phase shifter. A “reflector” reactor at the signal permits clear indications of the train control and prevents false clear indications if the cable between the reflector and the inductor should become short-circuited. The magnetic bridge is adaptable to many uses in other industries, and is extensively used for detecting vehicles in street traffic control systems. 相似文献
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《Endeavour》2020,44(3):100721
The term “street furniture” indicates objects mostly made of cast iron alloys and aimed to improve the quality of life in urban settlements, such as street lamps, fountains and gazebos. These objects are often ancient and relevant as cultural heritage. Despite the constant presence of street furniture in urban settlements, studies of its evolution along centuries are limited. Since functional aspects have been often considered prevalent against artistic and historical values, many objects have been considered obsolete, thus replaced or re-melted. Street furniture rarely received attention by scholars, and studies on this topic have been often incomplete.This study reviews the history of street furniture made of cast iron (CI street furniture), first examining the reasons behind the choice of this material, closely related to its diffusion during the First Industrial Revolution. The review discusses the relationship between CI street furniture and cultural heritage based on artistic, aesthetic and ethical issues, also examining historical catalogs. The development of CI street furniture in United Kingdom, France and Italy is reported, together with their local aspects. The production technique is discussed and the importance of preservation of CI street furniture is highlighted, emphasizing the need for globally planned interventions in this field. 相似文献
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针对传统路灯系统中能源浪费严重、信息化程度低和智能化程度低等不足,设计新型路灯系统。在以STM32为核心的嵌入式系统上使用环境传感器、电机、太阳能板和LoRa等模块,为路灯加载太阳能追光、自动调亮、环境检测和组网通信等功能,实现路灯节能最大化、运维信息化、智能互联化、集中管控化、照明智能化。 相似文献