基于复杂事件处理的图书馆无线网络监控系统

设计了一个基于复杂事件处理(CEP)技术的图书馆无线网络监控系统,建立了系统的框架流程,使用复杂事件处理(CEP)引擎实时远程监控和检测图书馆的复杂环境事件,发出警告并执行相应动作。该系统具有灵活性与实时性,能满足图书馆复杂多变的应用场景的监控要求。     

基于ISO15693协议的RFID智能货架管理系统设计

针对制造业中待加工物品管理效率低下的问题,设计了一套基于射频识别(RFID)的智能货架管理系统。通过RFID阅读器和手持式智能终端实时进行数据采集,采用复杂事件处理(CEP)进行数据清洗、过滤并传入制造企业生产过程执行系统(MES)。基于ISO15693协议对RFID阅读器实现发送功率可调、网口通信功能设计,借助. NET平台开发RFID中间件程序及网络应用程序,方便用户实时查询物品信息。系统已在制造企业中应用,效果卓著,性能良好。经实际测试,系统能够快速、稳定、高效地工作,实现了对待加工物品的实时监测和生产计划的高效执行。     

基于数字孪生的离散制造车间可视化实时监控方法

针对离散制造车间实时监控困难、调控能力差、管理不透明等问题,采用面向对象的方法,提出一种基于数字孪生的离散制造车间可视化实时监控方法.首先,搭建了基于数字孪生的离散制造车间可视化实时监控方法体系架构,明确了其关键实现流程;然后,分别围绕4个关键技术:基于AutomationML与OPC UA的数据建模及传输方法、事件驱动的虚实映射方法、基于复杂事件处理的车间逻辑建模方法、信息可视化及推送,详细阐述了该可视化实时监控的实现方法.最后,以某航天产品机加车间为应用案例,结合实际生产过程和开发的原型系统,验证了该监控方法的有效性.     

制造系统RFID应用可靠性评价及数据处理模型

针对复杂制造环境下RFID应用可靠性问题,给出了一种RFID系统应用可靠性的评价指标,在此基础上建立了改善RFID系统应用可靠性的分层数据处理模型。在该模型中,简单事件处理层接收阅读器网络产生的原始阅读事件,通过不重复约束规则清洗重读产生的冗余事件,聚合成精简的逻辑阅读事件;复杂事件处理层建立应用完整性约束规则,分析逻辑阅读事件,侦测并纠正多读、漏读现象,并以物理对象路径约束为例,描述了多读、漏读判定方法。应用案例验证了该模型的可用性。     

RFID在农机装配车间生产信息追踪系统的研究

随着物联网研究的深入,物联网技术在传感器网络技术、无线射频识别技术、条码与二维码技术方面获得了飞速的发展,并且RFID技术在生产制造型企业得到了广泛的应用。针对农机生产企业数据采集困难、不及时和装配线实时监控能力低,容易出现漏装、误装的现象。将RFID技术应用于生产信息追踪,以供企业对物料信息和生产计划进行实时的监控。并在此基础上,开发了生产信息追踪系统。     

基于事件流的IT资源监控系统

通过引入esper开源事件流处理引擎,成功地解决了传统基于数据库和内存的实时监控事件处理所遇到的资源占用大、操作频繁问题。详细讨论了基于事件流的IT资源监控系统设计思路,并给出了系统技术架构方案。该方案充分利用了esper事件流处理引擎,为IT资源监控系统的事件处理提供了一种新途径。     

复杂事件处理技术研究及应用

通过对复杂事件处理及其关键技术的研究,开发了一套可以利用中文来编辑定义规则的复杂事件处理引擎,该引擎实现了基于复杂事件处理规则的可编辑和自动执行的功能,提高了这类问题的处理效率和规则的可配置性。以柔性自动化车间的实际生产情况为例,定义了AGV、周转箱、设备、零件等简单事件和处理逻辑,实现了该系统,并验证了系统的可用性。     

基于事件知识图谱的变电站监控事件处理方法研究

提出了一种基于事件知识图谱技术的变电站监控事件处理方法,采用知识图谱的方法,建立了变电站监控各事件共指关系、因果关系和时序关系等逻辑关系,叙述了事件间的规律和模式,形成变电站监控事件处理方法.通过实际变电站监控事件处理系统的实操验证,使基于事件知识图谱的变电站监控事件处理方法能较好推广应用.     

面向U-制造的车间物流实时数据语义分析

针对U-制造环境下“数据有余、信息不足”的典型问题,研究了从车间物流实时数据中有效提取信息的语义分析原理。采用射频识别技术采集工艺路线物流实时数据;通过复杂事件处理方法将简单事件（即射频识别读事件）聚合为6种常见的物流复杂事件;构建物流进度矩阵完整地记录不同时刻复杂事件的发生,以矩阵的秩和元素作为主要参数反映和描述单批次生产任务的执行进度。给出了所提原理的运行模式,开发了对应的原型系统。通过某汽车电机制造商的应用案例验证了所提原理的可行性。     

面向仓储的RFID数据清洗技术研究

针对仓储中无线射频识别(RFID)原始数据的不可靠性问题,对仓储中RFID数据冗余和事件流乱序问题进行了研究,提出了一种面向仓储的RFID数据清洗模型。首先对仓储中RFID数据存在的问题进行了描述,建立了冗余数据和事件流乱序问题产生的抽象场景;然后结合RFID仓储数据清洗模型提出了相应的冗余数据清洗和事件流乱序修正算法,并介绍了相应算法的改进之处及具体实现步骤;最后利用读写器检测模型构造了RFID原始数据流,通过不同实验参数对记录数量和正确率指标进行了实验测试。研究结果表明:提出的数据清洗方法可以有效去除冗余数据并提高RFID事件输出的正确率。     

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.     

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。     

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....     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.