基于生态和耐久的绿色公路总体设计思想与实践

基于崇启通道交通功能的重要性及崇明国际级生态岛定位,介绍了崇启通道的工程概况、设计思想和理念;设计结合生态学、环境保护学,提出建设绿色公路的生态与耐久的核心目标,总结了在世界级生态岛上高速公路的设计与建设经验。     

A Research on Anti-Rollover Control for Vehicles with Semi-active Suspension

为利用半主动悬架阻尼连续可调的特性来提高汽车的主动安全性,建立了汽车侧翻预测模型,并以此为基础设计了一种双层结构的连续减振控制器,进行汽车防侧翻控制.上层控制器采用滑模控制方法输出期望侧倾力矩,下层控制器根据这个期望侧倾力矩,利用线性插值方法输出半主动悬架中各减振器的输入电流.利用MATLAB/Simulink对整个系统进行了仿真,结果表明,该控制器能有效提高汽车的防侧翻能力.     

锂离子电池组散热设计及送风策略

通过实验研究了锂离子电池1C倍率放电,20℃自然对流情况下的温升特性。测得了20℃环境温度下电池的充放电内阻特性,并根据某品牌18650型锂离子电池的物性参数以及实验测得的内阻数据建立了电池单体仿真模型,仿真计算了与实验同工况下的温度分布情况,最大误差4.9%。设计了一种包含480节电池的并行通风空气冷却散热结构,并通过正交试验进行了优化,得到了进出风孔距电池的最小距离1mm,上挡板距离电池的最小距离1mm,下挡板距离电池的最小距离1mm的最优结构,使电池组的最大温升下降了5.71℃,最大温差降低了5.06℃。并基于最优结构给出了120s后每60s改变送风方向的往复送风策略,使电池组即使在40℃、2C放电的恶劣工况下也能够工作在25℃-40℃,电池单体温差5℃以下的工作环境中。     

战术数据链组网方式分析

组网方式是设计战术数据链系统时要考虑的最基本的问题.就战术数据链的组网方式的特点和功能进行了分析,并在此基础上,进一步讨论了数据链系统的操作性能,主要是监视容量和循环时间的关系.     

短台阶弧形导坑法在浅埋大断面黄土隧道V级围岩段中的应用

浅埋大断面黄土隧道V级围岩段以往均采用双侧壁导坑法或CRD法进行施工，而这两种方法的施工进度都较慢，造价也较高。结合郑西客运专线高桥大断面黄土隧道在浅埋段采用弧形导坑法施工的成功实例，详细介绍该方法的施工工艺、变形特征、施工控制要点、变形控制基准值和施工体会。     

基于OBDⅡ系统监测信息的故障分析方法

第二代车载诊断系统——0BDⅡ系统是根据有关系列化标准、以诊断标准化为目的而开发的车载诊断系统。在概要介绍OBDⅡ系统功能、特点和监测机制的基础上，系统地论述了应用故障码和检测数据进行故障诊断的原理、条件与步骤。     

基于遗传算法的操舵仪控制参数在线优化

采用遗传算法对航向保持自动操作仪控制参数进行在线优化,计算机仿真表明,遗传算法可以方便地得到全局最优解,故控制器可以快速稳定地跟踪预定航向,且系统具有较好的鲁棒性。     

DGS8800e数字调速器功能原理剖析

通过系统框图,剖析ＤＧＳ８８００ｅ数字调速器各主要环节的作用功能,并深入了分析了系统的转速调节原理。     

Road Pricing models with maintenance cost

According to the Federal Highway Administration of the United States, maintenance expenditure takes up more than 25% of road revenue disbursement and this percentage has been increasing gradually. The reason for the increment in maintenance cost is that there lacks incentives for road users to take this cost component into their driving behavior. That is, different classes of vehicles should be levied different levels of congestion tax due to the different degrees of damage on the highway if a road pricing policy is implemented. This paper intends to incorporate this concept into road pricing literature by introducing two types of vehicles. After the analysis of the problem, we find that different types of vehicles should be charged different tolls. The toll includes not only the travel delay cost of one's own vehicle and the other types of vehicles, but also the marginal maintenance cost that is dependent on the traffic flow. A set of numerical examples is provided to demonstrate the theoretical analyses. The result shows that both the welfare and cost coverage rate will increase when the road pricing mechanism takes the maintenance cost factor into account.     

The analysis of regulation on private highway investment under a build-operate-transfer scheme

The build-operate-transfer (BOT) approach has become an attractive instrument for public facility provision, especially for a project that faces difficulty with public finance. This study analyzes the regulation alternatives on private highway investment under a BOT scheme and their impacts on traffic flows, travel costs, toll, capacity, and social welfare (total user-benefit in the traffic system including congestion). For comparison, five cases are analyzed: (1) No BOT with maximizing welfare, (2) No BOT with breaking even on finance, (3) BOT without regulation, (4) BOT with a minimum flow constraint (the total users will not be less than those in Case 1), and (5) BOT with a maximum travel cost constraint (the travel cost for users on a non-tolled road will not exceed the maximum tolerance). After each case is modeled and simulated on some functional forms, we find that the case of BOT with regulations performs between the cases of maximizing welfare and that of maximizing profit. From the perspective of the government, regulation has less power in a project with low elastic demand. Furthermore, even when the regulation is strict, a high cost-efficient firm with BOT could result in a higher level of social welfare than that without a BOT scheme.