一种可互锁防的防松螺母的设计

本文针对普通螺母连接因受冲击、振动等原因可能松脱的问题,设计了一种可互锁的防松螺母,介绍了螺母的组成结构、工作原理及安装过程.该螺母具有极大的防松抗振能力,消除了松动,保证了连接紧固件的安全,节约了大量处理螺母松动的时间.     

建立城轨供电系统可靠性评估体系的探讨

我国城轨交通供电系统主要由主变电所、中压网、牵引变电所或牵引/降压混合变电所和接触网4个系统构成,每个子系统一旦出现故障将影响整个供电系统的正常运行,造成列车停运。结合我国城轨交通供电系统的特点,通过建立城轨供电系统各种设备可靠性基础数据库,研究我国各大城市轨道系统的运行情况,提出我国城轨供电系统可靠性分析评估框架。     

公交报站显示设备路线制作集成软件的设计

本文针对公交行业现状和发展要求，结合本人长期探索和实践，提出一个基于XML文档的集成软件解决方案该方案以XML文档为基础，构件一个路线集成制作软件，它具有良好的可扩展性和兼容性，能够方便、灵活、高效的完成公交广播报站的线路制作，已经在国内外公交市场上得到广泛应用。     

高速检测车降噪方案研究

重点分析高速检测车噪声的成因及传播途径，并针对噪声源、传播途径、受声点等方面提出了控制措施。试验验证表明：采用这些控制措施的高速检测车产生噪声符合人体乘坐舒适度要求，达到了预期目标，证明了该方案的切实有效性。     

Model Predictive Coordinated Control for Dual-Mode Power-Split Hybrid Electric Vehicle

Power-split hybrid electric vehicles (HEVs) have great potential fuel efficiency and have attracted extensive research attention with regard to their control system. The coordinated controller in HEV plays an important role in tracking the optimal state reference generated by the energy management strategy (EMS), so as to reach the desired fuel efficiency. Meanwhile, the coordinated controller also has a significant impact on driving performance. To improve its performance, the design of a model predictive control (MPC) based coordinated controller in power-split HEV is presented. First, a non-linear, time-varying constrained control oriented transmission model of a dual-mode power-split HEV is formulated to describe this control problem. Then, to solve this problem, the non-linear part in the transmission model is linearised, and a linear MPC is used to obtain the control signals for the motors and engine at each time step. To meet the requirements of real-time computation, a fast MPC method is also applied to reduce the online computation effort. Simulations and experiments demonstrate the effectiveness of the proposed MPC-based coordinated controller.     

打击敌军事目标兵力需求模型研究

基于概率论和随机过程理论,构建了我方打击敌军事目标的兵力需求模型,通过一个实例,进行计算机模拟,验证了此模型的准确性及可行性.     

Dynamics characteristics analysis and control of FWID EV

Compared with internal combustion engine (ICE) vehicles, four-wheel-independently-drive electric vehicles (FWID EV) have significant advantages, such as more controlled degree of freedom (DOF), higher energy efficiency and faster torque response of an electric motor. The influence of these advantages and other characteristics on vehicle dynamics control need to be evaluated in detail. This paper firstly analyzed the dynamics characteristics of FWID EV, including the feasible region of vehicle global force, the improvement of powertrain energy efficiency and the time-delays of electric motor torque in the direct yaw moment feedback control system. In this way, the influence of electric motor output power limit, road friction coefficient and the wheel torque response on the stability control, as well as the impact of motor idle loss on the torque distribution method were illustrated clearly. Then a vehicle dynamics control method based on the vehicle stability state was proposed. In normal driving condition, the powertrain energy efficiency can be improved by torque distribution between front and rear wheels. In extreme driving condition, the electric motors combined with the electro-hydraulic braking system were employed as actuators for direct yaw moment control. Simulation results show that dynamics control which take full advantages of the more controlled freedom and the motor torque response characteristics improve the vehicle stability better than the control based on the hydraulic braking system of conventional vehicle. Furthermore, some road tests in a real vehicle were conducted to evaluate the performance of proposed control method.     

一种基于MRF的多层遗传递减视频对象分割算法

提出一种视频对象分割方法,将时域信息、空域信息和图像颜色特征有效地结合起来,采用MRF遗传递减式分类来提取视频对象.利用视频帧的颜色特征,在初始分割中采用时空域分水岭方法,建立一个时空域毗连图(ST-RAG);基于时空域毗连图建立马尔可夫随机场(MRF)模型,在分割过程中采用遗传递减式方法对区域进行合理分类,利用形态学进行后处理,分割出感兴趣的视频对象.实验结果表明所获取的分割方法具有灵活性,且精度高.     

一种PCI-485通讯卡固件的设计方案

设计了一款基于PCI总线的485通讯卡固件程序.其主要功能是对上位机的数据处理并下传给下位机;对下位机进行扫描,看有否数据上传,并将上传的数据传输给上位机.程序主要分五个模块:主程序模块、初始化模块、下发数据模块、上传数据模块和呼叫上传模块.该通信卡实现了上传下达的功能,避免了传输过程中的同步传输问题.     

掺石墨水泥基复合材料电磁波吸收性能研究

以水泥净浆为基体、高纯石墨粉为电磁波吸收剂,制备了掺石墨水泥基复合材料。采用矩形波导法测试不同石墨掺量下的水泥基复合材料的电磁参数,并基于传输与阻抗理论计算得到试验样品的反射损耗RL,另外又定义了损耗因子tanδ,最后根据广义匹配定律定义了M值。结果表明,15%石墨的水泥基复合材料低频段具有较高的介电常数,且其在吸波层厚度为5 mm时,出现两个吸收峰,分别为RL=-34.9 d B和RL=-53.75 d B,反射损耗RL-10 d B的频带达到0.43 GHz(3.62~3.95 GHz),有效吸收频带较窄。此外,石墨粒径组成尺寸对掺石墨水泥基复合材料吸波能力有一定影响。