车辆CAN总线支路的休眠与唤醒实现

为减少蓄电池电能的无谓消耗,对某车辆的汽车电控系统的CAN总线支路开发休眠与唤醒功能。硬件方面对CAN总线支路的供电电路和CAN收发器进行了升级,软件部分设计了一套CAN收发器工作模式切换的控制策略。最终该休眠与唤醒功能成功运用到实际车辆上。     

基于成本切换的闭环供应链离散动态模型及其模糊鲁棒控制

为研究Internet环境下基于成本切换的不确定闭环供应链运作问题,建立了一类基于成本切换的闭环供应链动态模型,该模型包括基于成本的切换信号向量以及第三方逆向物流服务商回收和制造商自行回收两个子系统,该模型的逆向物流部分包括废旧产品回收再制造部分和产品无偿回收部分.针对闭环供应链系统在第三方逆向物流服务商回收和制造商自行回收两种模式切换过程中成本波动较大的问题,分析了闭环供应链切换系统的运作过程,且在运用Lyapunov-Krasovskii函数方法和并行分布补偿算法的基础上,以线性矩阵不等式形式提出和证明了闭环供应链切换系统渐近稳定的充分条件,并设计了切换律.通过一个仿真例子验证了所提方法的有效性.     

利用单片机实现多路矩阵切换

介绍多路矩阵切换系统利用MCS-51系列单片机,配合外围扩展电路,用来控制小型继电器,实现矩阵切换功能。用普通数字键盘作为输入设备,用LED数码管作显示,该显示亮度高、易分辨。可实现点通、组通和全通等控制。可用于各种矩阵控制。     

用于矩阵并行运算的加速板总线接口设计及其实验

矩阵运算是计算机图像识别,特别是神经网络识别系统中频繁使用的基本运算之一.本文介绍了一种用电路硬件实现这种运算的微机总线接口板设计原理、编程方法和根据此技术实现的用于光电混合神经网络目标识别系统内矩阵相乘运算的微机ISA总线接口实验.实验结果表明,应用这种新方法实现的运算不仅速度快,而且程序简单,能一次完成4K字节×4K字节数据量的矩阵相乘运算.该设计原理及相应技术也一般适用于任何需要频繁使用矩阵运算的系统中.     

在现场总线控制系统中实现控制回路切换

本文叙述了控制回路切换和变频调整速技术在现场总线控制系统中的应用。介绍了ＦＣＳ的软硬件配置和控制策略组态方案。     

基于单片机的数字矩阵切换系统设计

通过对场逆程切换基本原理的分析,介绍了一种基于单片机的数字矩阵切换系统的设计方法;对系统硬件构成和软件设计作了详细的说明,所设计的矩阵系统具有记忆功能,能用键盘和PC机进行控制,用液晶模块显示系统的切换状态。该系统具有较高的性能价格比,已进入推广阶段。     

铁路客车区域火灾报警控制器研究

分析了铁路客车区域火灾报警系统应具备的功能及其在铁路客车微机网络系统下的工作模式,在开发过程中采用了单片机、CAN总线技术。实现了对单节客车区域内火灾报警系统中各探测器的有效管理。开发的系统可运行于现行的列车总线控制系统,与各类火灾探测器构成了铁路客车的火灾报警系统。可实现客车内火警信息的探测、报警。并将探测信息传送到列车总线系统的功能。     

PCB功能测试系统的设计与实现

本文介绍了一种搭建PCB功能测试系统的方法。该测试系统采用总线结构的思想,利用继电器矩阵灵活配置输入/输出端口的特点,将测试资源和被测单元(UUT)的信号连接到总线上,实现信号间互通。系统自动化程度高,可靠性和扩展性强,使用方便灵活。     

基于CAN总线的船舶火灾报警系统的设计

本文介绍了一种以C8051F040徽控制器为控制核心，基于CAN总线的船舶火灾报警系统。文中简要介绍了C8051F040徽控制器和CAN总线．给出了系统硬件框图和部分硬件电路以及软件流程图。文中还详细描述了实现RS232接口与CAN总线接口协议转换的CAN-RS232转接板电路图和设计方案．实际应用表明该系统效率高、技术先进、工作可靠。     

基于TwinCAT的主减速器试车台监测系统设计

针对某型号直升机主减速器试车台的信号采集与监测要求,设计了以Twin CAT为核心的试车台监测系统。采用CANopen与PROFIBUS-DP现场总线和Ether CAT总线构成二级分布式总线网络,实现对多种信号的数据采集;采用基于Twin CAT软PLC技术进行数据的处理、监测报警,并通过ADS通信与上位机人机接口(HMI)进行交互;基于.NET平台实现上位机用户管理、监测报警数据显示及历史数据查询等,使用Microsoft SQL Server 2008大型关系数据库实现数据管理。详细介绍了系统的设计与开发过程,现场应用表明,系统具有较好的稳定性和实时性。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.