基于MS9S12DG128单片机的电动汽车电池管理系统设计

根据动力电池组在电动汽车上的使用特点和要求,采用了带MSCAN、且具有强大功能模块的嵌入式微处理器MS9S12DG128,完成了电动汽车用电池管理系统的硬件设计,实现了对电压、电流、温度的实时精确采集、SOC的精确估计和CAN通讯。实验表明,本系统各方面性能优越。     

EH4与地震反射法在高速公路长大深埋隧道勘察中的联合应用研究

EH4电磁成像系统是一套目前较先进的电磁勘探方法,具有探测深度大、设备轻、速度快、费用低、精度较高、直观等特点。地震反射法具有探测深度大、对地形要求不高、可划分多层界面、能提供波速、精度较高等特点。文章首次把EH4电磁法与地震反射法联合运用于高速公路长大深埋隧道勘察中,两者结果基本一致,由此成功解译出了隧道的软弱层、地下水及断层破碎带的位置,并划分出隧道的围岩类别,为高速公路长大深埋隧道提供了一种新的综合勘察方法。     

系统效能通用评估工具研究

基于数据库和算法集成,设计了一套具有良好通用性、灵活性、可扩展性的系统效能评估工具,并以此工具为基础,针对不同的评估需求、数据量和应用环境提出对应的解决方案.     

运用微机监测道岔电流曲线分析提速道岔故障

S700K电动转辙机正常道岔动作电流曲线与故障情况下动作电流曲线的对比观察,能及时发现道岔存在的隐患,以便查明原因,有针对性地采取消除措施,有效地提高现场设备的运用质量。     

Modelling nutrient fluxes from sub-arctic basins: Comparison of pristine vs. dammed rivers

The deterministic Riverstrahler model of river functioning is applied for the first time to sub-arctic catchments. Seasonal nutrient (N, P, Si) deliveries to the coastal zone are simulated, and nutrient annual fluxes are established for the nearly pristine river Kalix (hereafter called Kalixälven) and the heavily dammed river Lule, (hereafter called Luleälven) both located in Northern Sweden and draining into the Bothnian Bay, Baltic Sea.For Kalixälven simulations are performed with a runoff calculated from precipitation, evapo-transpiration and temperature data for the period 1990–1999, using a hydrological model calibrated on observed monthly discharges at the river outlet. The same hydrological parameters are used to calculate specific runoff for the Luleälven basin in absence of dam regulation. Reservoir filling and emptying are simulated using a simplified representation of their management rules. Diffuse sources of nutrient are evaluated according to land cover of the catchment. The simulated seasonal trends are within the range of the observed data, in particular for discharge, dissolved silica, total phosphorus, inorganic nitrogen and total organic carbon. Specific runoff is 50% higher in the Luleälven than in the Kalixälven watershed due to higher altitudes and precipitations. Average silica, nitrate and phosphorus concentrations are much lower in Luleälven than in Kalixälven. Comparison of model results for the Luleälven with and without dams shows a reduction of respectively 25% and 30% in silica and phosphorus fluxes delivered at the outlet, while nitrogen delivery is increased by 10% in the dammed vs. undammed river system. The model allows assessing the respective role of reservoir trapping of nutrient in the reservoir through algal uptake and sedimentation, and of changes in the vegetation induced by flooding the valley formerly covered by forests and wetlands.     

Robust cascade control for the horizontal motion of a vehicle with single-wheel actuators

The article presents a cascade control for the horizontal motion of a vehicle with single-wheel actuators. The outer control loop for the longitudinal and lateral accelerations and the yaw rate ensures a desired vehicle motion. By a combination of state feedback control and observer-based disturbance feedforward the inner control loop robustly stabilises the rotating and steering motions of the wheels in spite of unknown frictions between tyres and ground. Since the three degrees of freedom of the horizontal motion are affected by eight tyre forces, the vehicle considered is an over-actuated system. Thus additional control objectives can be realised besides the desired motion trajectory as, for example, a maximum in driving safety. The corresponding analytical tyre force allocation also guarantees real-time capability because of its relatively low computational effort. Provided suitable fault detection and isolation are available, the proposed cascade control has the potential of fault-tolerance, because the force allocation is adaptable. Another benefit results from the modular control structure, because it allows a stepwise implementation. Besides, it only requires a small number of measurements for control purposes. These measurements are the rotational speeds and steering angles of the wheels, the longitudinal and lateral acceleration and the yaw rate of the vehicle.     

基于C/S模式的分布式雷达情报传输系统的设计

针对目前雷达情报传输网中只能单向传输点迹和航迹情报,不能实现情报共享的问题,提出了基于C/S模式的分布式雷达情报传输系统的方案,用来实现多种情报的传输和共享,并对系统协议的选取和网络数据加密进行了分析.     

基于广域网的视频监控系统的实现

本文介绍了一种以广域网为基础的视频监控系统的模型及实现方法。系统有中心服务器端和用户浏览器端组成。系统采用DSP硬件平台及广域网接口,实现其硬件构架。视频压缩算法采用MPEG4编解码算法。浏览器端调用ATL技术创建的COM组件,用户可以访问到监控设备。该系统为一些多个分散监控场所的集中式管理提供了一种可行的方法。     

动车运用所洗车库与信号系统接口的研究

主要从动车所外皮洗刷库的作业方式出发,着重阐述控制条件及影响因素,提出满足动车洗车作业需求的控制电路,用于指导其工程设计。     

系统架构浅析

ERP产品在对连锁企业系统架构支持上进行了较大的完善,为用户提供了多种系统部署方案,用户可根据自己的连锁管理模式、连锁体系布局、网络硬件环境等条件因素,选择适合的连锁系统架构。