基于多Agent的分布式制造执行系统的建模

采用UML技术，提出了一种开放式、模块化、分布式、可配置、可集成和可维护的基于多Agent的制造执行系统(MES)模型。分析了制造系统中的制造执行系统域，提出了基于多Agent的MES模型并详细分析了该模型的MES的功能实现，最后给出了正在实施的MES系统框架。该MES系统能够容易地与企业资源计划(ERP)、车间控制系统(FCS)及其他制造系统相集成。     

面向制造过程的分布式协作集成车间控制系统

以CORBA体系结构为基础。以以太网／现场总线为架构。采用Agent技术建立了面向制造过程的信息资源集成和数控设备集成的两层车间控制系统。该系统简化了车间管理层次。加快了信息传输速度，提高了数控机床的利用率。实现从产品设计到制造加工的全过程集成。更好地满足车间敏捷性的需要。     

生产车间混合式控制结构模型和协商机制研究

为了提高车间控制系统的柔性、开放性和全局优化性能,在分析现有车间控制体系结构的基础上,融合Agent技术,提出了一种适应性混合式车间控制系统体系结构模型。该模型利用递阶结构将控制功能设计成系统优化Agent、单元协调Agent和单实体Agent三层结构,并允许同层Agent及上下层Agent之间的协商。为了进一步提高协商效率,集成分布式协商和全局控制,设计了基于招投标机制和示例学习方法的协商机制,详细分析了包括时间约束算法和基于示例的学习方法的协商机制核心算法。在JADE(Java Agent development framework)平台上构建了原型系统。     

虚拟企业中数字车间与供应链系统的集成与协调

数字车间和供应链系统是虚拟企业的两个重要的功能组织。数字车间与供应链系统的信息集成和功能协调是虚拟企业能够高效运作的基础。Agent技术是构建大型、分布式系统的有效方法。本文研究了基于Agent技术的虚拟企业集成技术和协调机制。     

基于Agent的智能制造系统实时动态调度机制研究

近年来随着制造企业生产过程中不确定因素增加,动态调度问题变得愈发复杂。在多Agent制造系统基础上提出了一种基于事件触发的制造系统实时动态调度机制,建立了相应的架构模型,并从调度方法、多Agent协调控制,以及调度控制算法等方面对该机制进行了详细说明。该机制可以根据系统运行状态实现车间层的实时控制和动态调度。最终通过实验表明该方法有效减少设备故障等扰动因素对系统运行的影响。     

基于RFID和Agent的刀具管理方法研究

针对大规模可定制化生产中离散刀具资源管理不能快速适应生产加工变化、不易动态追踪管理的问题,提出了基于RFID和Agent技术的刀具管理方法。首先介绍刀具管理Agent的概念和功能结构,根据刀具使用流程将刀具管理Agent细分为库存管理Agent、机床Agent等几大组件,然后详细阐述RFID事件处理Agent的内部结构和运行机制,它是处理大量RFID事件的基础,在此基础上分析Agent之间的通信与协调关系,最后构建原型系统,对刀具管理的处理流程进行了分析,证明该方法的可行性。     

基于数字化人的车间数字化制造系统

基于移动通信及移动计算技术,提出了车间数字化制造系统中“数字化人”的概念。数字化人可实时接入车间数字化制造系统,通过感官获取信息,根据形象思维、直觉和经验作出判断,并与基于长期存储、精确推理和快速数据处理的机器智能无缝地结合起来,实现灵活快捷的最佳生产决策。在此基础上,构建了支持数字化人的车间数字化制造系统原型,分析了该原型系统的网络结构和功能。结合多Agent技术,构建了该类型数字化车间的运行模式。     

基于多Agent的网络化车间制造系统调度问题研究

提出一种基于多Agent的网络化车间调度方法，给出任务驱动的网络化车间多Agent调度模型，提出了车间调度的综合指标，分析了模型中各Agent的主要功能和调度过程的算法流程。在此基础上，针对不同的动态事件，讨论了相应的调度策略，以实现网络化车间任务的分配和再调度。     

基于Multi-gent的敏捷售后服务系统研究

为了提高企业售后服务系统的适用性和通用性，建立了一个基于多智能体的敏捷售后服务系统。首先分析敏捷虚拟企业环境下企业对售后服务系统的需求，以及他和传统企业售后服务系统的差异，然后建立由数据层、业务对象层、协同层和访问层四个层次组成的系统框架结构。实现该系统涉及的关键技术包括智能Agent结构设计、Agent之间的协同机制和系统对动态企业模型的支持方法。该系统能够自主地适应企业组织结构和业务流程的动态变化，支持企业流程的快速再造。     

基于多Agent的网络化车间制造系统通讯模型与合作协议的研究

在研究MAS结构及Agent通讯特点的基础上 ,结合MAS在网络化车间动态调度系统中的应用 ,分析了系统中各Agent功能 ,提出以合同网协议为基础的多Agent合作过程。设计了以CORBA标准作为多Agent通讯和互操作基础的 ,以KQML与XML相结合的Agent标记语言为交互语言的多Agent通讯模型。     

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.