科创中国

The intermittent connection(IC)of the field-bus in networked manufacturing systems is a common but hard troubleshooting network problem,which may result in system level failures or safety issues.However,there is no online IC location identification method available to detect and locate the position of the problem.To tackle this problem,a novel model based online fault location identification method for localized IC problem is proposed.First,the error event patterns are identified and classified according to different node sources in each error frame.Then generalized zero inflated Poisson process(GZIP)model for each node is established by using time stamped error event sequence.Finally,the location of the IC fault is determined by testing whether the parameters of the fitted stochastic model is statistically significant or not using the confident intervals of the estimated parameters.To illustrate the proposed method,case studies are conducted on a 3-node controller area network(CAN)test-bed,in which IC induced faults are imposed on a network drop cable using computer controlled on-off switches.The experimental results show the parameters of the GZIP model for the problematic node are statistically significant(larger than 0),and the patterns of the confident intervals of the estimated parameters are directly linked to the problematic node,which agrees with the experimental setup.The proposed online IC location identification method can successfully identify the location of the drop cable on which IC faults occurs on the CAN network.

本文通过ARM+Linux系统对电梯环境如温度、湿度、光照等进行检测和控制,并提出了智能电梯的发展方向.基于ARM+Linux系统,利用CAN总线等构成了电梯的控制系统,利用COMS摄像机实现了电梯视频监控,并利用ZigBee无线网络传感器对电梯内的温度、湿度和灯光进行监控.通过新技术在电梯上的应用,使电梯的运行更加智能化,且Linux系统有很好的可移植性,使智能电梯控制系统的升级非常方便.

主要研究了CAN通讯卡在煤矿胶轮车控制系统中的应用.CAN通讯卡通过IPC与地下基站通讯,主程序首先通过接口库函数访问动态链接库来初始化CAN卡;VCI_Initcan初始化CAN卡,VCI_StartCAN启动CAN卡,然后,线程函数VCI_Receive的循环从基站接收数据;最后通过VCI_Transmit函数向基站发送控制命令来控制和调度胶轮车.实验结果表明,CAN卡被接口库函数成功地调用,在IPC和基站间建立了可靠通讯,为矿井下胶轮车的自动调度奠定了基础.

The existing researches of the evaluation method of ride comfort of vehicle mainly focus on the level of human feelings to vibration. The level of human feelings to vibration is influenced by many factors, however, the ride comfort according to the common principle of probability and statistics and simple binary logic is unable to reflect these uncertainties. The random fuzzy evaluation model from people subjective response to vibration is adopted in the paper, these uncertainties are analyzed from the angle of psychological physics. Discussing the traditional evaluation of ride comfort during vehicle vibration, a fuzzily random evaluation model on the basis of annoyance rate is proposed for the human body's subjective response to vibration, with relevant fuzzy membership function and probability distribution given. A half-car four degrees of freedom suspension vibration model is described, subject to irregular excitations from the road surface, with the aid of software Matlab/Simulink. A new kind of evaluation method for ride comfort of vehicles is proposed in the paper, i.e., the annoyance rate evaluation method. The genetic algorithm and neural network control theory are used to control the system. Simulation results are obtained, such as the comparison of comfort reaction to vibration environments between before and after control, relationship of annoyance rate to vibration frequency and weighted acceleration, based on ISO2631/1(1982), ISO 2631–1(1997) and annoyance rate evaluation method, respectively. Simulated assessment results indicate that the proposed active suspension systems prove to be effective in the vibration isolation of the suspension system, and the subjective response of human being can be promoted from very uncomfortable to a little uncomfortable. Furthermore, the novel evaluation method based on annoyance rate can further estimate quantitatively the number of passengers who feel discomfort due to vibration. A new analysis method of vehicle comfort is presented.

基于一汽大众速腾的动力传动CAN(多路传输)数据总线,分析了动力传动系统网络结构,阐述了动力传动系统CAN数据总线终端电阻工作原理与检测方法;通过BOSCH FSA740标准型发动机分析仪诊断测试,进行了动力传动系统CAN数据总线断路、CAN_H与CAN_L数据导线之间短路、CAN数据总线对正极或负极短路的诊断测试和分析.

为便捷上位机访问工业现场CAN总线,提出了一种便携式即插即用的USB-CAN适配器设计方案.该适配器采用CH341作为USB总线转接芯片,直接把USB总线协议转化为并口协议;选用SJA1000芯片作为CAN控制器,支持CAN2.0B协议,以适应不同的CAN总线需求.系统从USB端口取电,且无需MCU/DSP介入,简化了电路结构;利用CH341主动并口功能,经相应的控制时序逻辑转换,上位机即可驱动SJA1000,进行CAN总线访问.该适配器支持上位机自主配置,灵活强,可靠性高.经实验测试,适配器支持访问不同的CAN总线网,速率可达1 Mb/s.

提出一种开放式CAN总线通信仿真开发平台的设计方法,支持可调设计、动态开发和可视化开发,简化了仿真软件的开发过程,对已开发的软件可以根据需求直接修改,提高了软件的适应性.解决了CAN总线消息与有效信息内容动态编辑、虚拟功能控件与CAN总线信息映射关联、显控界面虚拟控件动态编辑等技术难点,并提出了总线数据来源定位技术、基于频率分包与跟踪技术、总线消息"数据池"技术和字节内定位赋值技术等方法,开发了可模拟CAN总线网络信息交互功能的仿真开发平台,基于该平台可以进行物理设备的功能测试、仿真总线功能和总线通信故障诊断,也可作为虚拟控制设备进行应用.开发的CAN总线通信仿真软件经过实际运行试验,仿真效果良好.

本设计介绍一种基于CAN/LIN总线式的汽车BCM系统.该方案采用ECAN^TMPICl8F45K80增强型闪存单片讥作为主控芯片.采用彗能功率开关(IPS)AUIPS6011组成H桥电路实现电机正反转.使H桥电路的设计具有过流关断,过温关断.电机软寓动等保护功能.提高7系统的可靠性.

针对文本中冗余的欠缺,造成在文本中隐藏信息量少而难以实现隐密信息的传输,提出了一种基于聊天表情符号的信息伪装新方法,应用于网络聊天中以增加隐蔽性.该方法简单实用、可操作性强,实验证明,该算法具有良好的不可见性和安全性,容量也较为理想,达到信息伪装的目的.

在可持续发展与低碳经济的背景下,绿色物流逐渐成为一个重要的研究领域.其融入了物流管理学、生态经济学、工业生态学、生态伦理学等交叉学科,也得到学术界和业界的广泛关注.以《中国期刊全文数据库》为主要数据来源,借助NoteExpress、CiteSpace以及Pajek等软件,对绿色物流近年来的研究状况进行统计,分析发表论文数量的年度分布情况,从研究领域的知识结构人手,探究我国绿色物流的研究特点以及研究主题等.