我国交通运输行业公路工程材料标准化现状及发展趋势

近年来,公路工程材料行业的标准化工作发展迅速,标准数量和质量都得到了跨越式的提升。鉴于此,结合工作实际,对该行业标准化工作的现状和存在的问题进行了全面梳理和分析,并对未来的发展趋势进行了展望。     

高速公路机电维修维护管理研究

通过对高速公路的机电设备维修管理现状进行论述,从设备使用不统一、维修成本较高及人员专业技术不到位等方面,多角度分析了高速公路机电设备管理的不足,并提出相应的措施,以加强高速公路机电设备的维护维修管理。     

高速公路机电设备安装施工管理探析

鉴于高速公路设备安装的重要性及其技术性要求较高,首先对高速公路的机电工程的三个部分进行分析,而后讨论了高速公路机电安装及其施工准备,最后从安装施工工程的进度、质量和安全控制三方面分析了高速公路机电设备的安装施工管理,以便为相关工作提供借鉴。     

DirectShow在船舶视频监视系统中的应用

采用DirectShow技术进行船舶视频监视系统的设计.介绍船舶视频监视系统原理及实现步骤,包括Source Filter的编写和Filter Graph的创建.视频监视系统能满足船舶行业日常安全管理和及时发现灾情和隐患的需求.     

关于土工试验室现状与发展的思考

从土工试验室的资质、隶属关系、人员构成、仪器设备、方法标准和工作环境等方面出发,分析现阶段我国建设市场上土工试验室的现状．建议在行业准入制度、市场监管、行政处罚、勘察单位的内部管理与协调等方面采取必要措施确保土工试验数据的准确性和真实性。     

我国汽车环保检测业的发展现状与出路

在汽车行业快速发展的今天,汽车环保检测业作为汽车市场的服务行业,也逐步发展起来。本文首先阐述了我国汽车环保检测业的发展现状,重点分析了行业存在的问题,最后提出了行业发展的对策。     

Traffic conflict assessment for non-lane-based movements of motorcycles under congested conditions

Traffic conflict under congested conditions is one of the main safety issues of motorcycle traffic in developing countries. Unlike cars, motorcycles often display non-lane-based movements such as swerving or oblique following of a lead vehicle when traffic becomes congested. Very few studies have quantitatively evaluated the effects of such non-lane-based movements on traffic conflict. Therefore, in this study we aim to develop an integrated model to assess the traffic conflict of motorcycles under congested conditions. The proposed model includes a concept of safety space to describe the non-lane-based movements unique to motorcycles, new features developed for traffic conflict assessment such as parameters of acceleration and deceleration, and the conditions for choosing a lead vehicle. Calibration data were extracted from video clips taken at two road segments in Ho Chi Minh City. A simulation based on the model was developed to verify the dynamic non-lane-based movements of motorcycles. Subsequently, the assessment of traffic conflict was validated by calculating the probability of sudden braking at each time interval according to the change in the density of motorcycle flow. Our findings underscore the fact that higher flow density may lead to conflicts associated with a greater probability of sudden breaking. Three types of motorcycle traffic conflicts were confirmed, and the proportions of each type were calculated and discussed.     

公交驾驶员驾驶行为对油耗的影响及其评价指标

基于通过车辆无线远程监控系统采集的天津市某公交线路6位不同驾驶员累计达2.5万km的车辆运行数据,分析了描述驾驶员驾驶行为的车辆相对正加速度、加速踏板行程分布和换挡切换速度分布3个因素对行车油耗的影响。再采用因子分析法将3种影响因素归纳成一个综合评价因子。结果表明,该综合评价因子与行车油耗的相关系数达到0.9,可作为驾驶员驾车油耗的有效评价指标。     

汽车整体式转向梯形机构优化设计

以MATLAB软件为优化工具,通过对汽车整体式转向梯形进行合理设计,尽可能地保证汽车在转向过程中全部车轮均绕同一个瞬时转向中心行驶,使在不同圆周上运动的车轮,作无滑动的纯滚动运动。     

铅酸蓄电池放电特性研究

电动汽车具有低污染、低排放、低能耗、低噪声、高效率等优点,在环境保护和新能源利用等方面具有无可比拟的优势,是解决能源危机和环境污染问题较为有效的途径。蓄电池作为电动汽车的动力源,直接影响着电动汽车的动力性和经济性,因此本文针对应用最普遍、技术最成熟的铅酸蓄电池放电特性进行研究。本文首先对铅酸蓄电池的放电原理进行研究,建立了铅酸蓄电池放电模型,基于蓄电池综合测试系统进行了不同放电倍率下的放电试验,最后应用归一化数学方法建立了蓄电池放电试验模型,获得了蓄电池端电压与SOC的关系曲线,为蓄电池的进一步研究奠定了试验基础和理论模型。