制造云构建关键技术研究

阐述了云制造系统中"制造云"的构建过程,并对制造云构建过程中所涉及的主要关键技术做了较深入的探讨.给出了制造云及制造云服务的相关说明,对云制造模式下的资源进行了详细分类.在此基础上,围绕分散资源的感知、虚拟接入、服务化和云服务部署等关键问题展开了研究,并提出了制造能力元描述模型,为最终实现高效、智能的云制造系统提供了支持.结合产品全生命周期设计、仿真阶段任务需求,依据所提构建方法与关键技术,初步开发了一个面向设计仿真的云服务平台原型.     

面向中小企业的制造资源云服务平台开发

在云制造大环境下,为使中小企业通过高度共享企业内外部优势制造资源来提升自身产品设计制造和技术创新能力,构建了面向中小企业的制造资源云服务平台体系架构。在此基础上研究了云制造资源池的构建方法,阐述了制造资源分类及其虚拟化描述模板,给出了制造资源服务化封装、接入过程及云服务的WSDL描述实例,完成了数据库主要数据表间的E-R模型设计;最后基于.NET框架开发面向中小企业云服务平台以实现区域内优势制造资源聚集,为广大中小企业提供按需使用的优质制造资源云服务。     

面向边缘计算的制造资源感知接入与智能网关技术研究

针对云端智能制造与智慧服务系统应用中面临的大量异构制造设备资源感知接入困难、数据分析时延大等问题,分析探讨了面向边缘计算的制造资源感知接入特点、应用场景及接入模型构建方法;研究开发了边缘智能网关软件系统,设计了云边协同服务架构,实现了多种通信协议支持、数据采集分发、应用管理与安全防护等功能。分析了云边协同服务模式下边缘节点智能网关的重要作用与任务,结合复杂装备智能制造样板间生产线与虚拟工厂应用系统,实现了制造资源感知接入技术、边缘智能网关功能验证与应用示范。     

一种基于知识整合的集团企业云制造服务平台

工业互联网环境下,我国生产型集团企业需要共享与协同制造资源和制造能力。针对这一需求,探讨了面向生产型集团企业的云制造服务平台的关键技术之一,即多源多领域知识融合与管理,构建了"领域本体-知识项-数据资源"三层结构的工程知识表达体系。通过云制造服务平台在某生产型集团企业应用实施,实现原型系统软件开发和技术验证。     

制造资源云集成元建模及云Agent服务调度研究

针对云制造过程中的制造资源虚拟化问题,分析了制造资源的存在形态、构成及其属性,提出基于RFID技术与对象名解析服务的制造资源感知与追溯逻辑架构,以实现物理制造资源虚拟化;通过建立虚拟制造资源静态-动态集成元模型,为异构、动态的虚拟制造资源的重组和融合提供统一描述机制;在此基础上,将移动Agent和云服务发现机制相融合,提出云Agent（cloud  Agent）的概念,并基于资源中介的改进合同网机制,实现云制造服务自适应管理和调度;给出了面向复杂产品协同的制造资源云服务平台原型系统,并结合汽轮机制造服务协同应用案例,初步实现了制造资源虚拟化和服务部署。     

云制造加工设备服务化封装与云端化接入方法

针对云制造模式下对制造资源的服务化封装和云端化接入的新需求,结合物联技术,提出一种云制造设备的服务化封装与云端化接入方法,设计了设备端传感器群优化配置、制造能力描述模型、实时制造服务状态信息主动感知、云制造设备的协作生产与自主决策、设备端制造服务封装、制造服务云端化接入等关键技术的实现框架,使加工设备的制造能力可被主动感知,制造服务过程信息透明和实时可访问,并能通过一种松散耦合和即插即用的方式接入云制造平台,为云制造中海量制造资源的云端化接入、主动发现、优化配置,以及生产任务的高效、高质生产提供了一种新思路。     

面向数字孪生的流程型制造车间管控系统

针对流程型制造车间数据采集不全面、生产过程不透明、生产故障监控实时性差而造成的产品劣品率与生产成本高问题，构建了一种制造物联和数字孪生融合的可视化管控系统。围绕“数据感知与传输、数据适配与存储、数据分析与应用”这一主线，分析了物理制造车间的监控数据体系和管控需求，构建了面向制造物联的多源异构数据感知、传输与分析架构，提出了基于数字孪生的物联、物理、虚拟交互方案，实现多视角、分层次的数据可视化监控。最后，该系统在某锂电池材料生产车间部署应用，验证了其优良性能。     

云制造服务平台的资源使用及访问控制

为了重新规划与设计面向云制造服务平台的访问控制模型,从资源的使用角度出发,将云制造服务平台中的广义制造资源划分为硬件资源、软件资源、信息资源、计算资源与智力资源,分析了各类制造资源在云制造服务平台中的使用方式和访问控制需求,依此设计了云制造服务平台的访问控制模型,定义了系统级别的宏安全策略及子域级别的访问控制请求与响应流程,并展示了初步研究成果——可应用于云制造服务平台协同式子域的授权路径分析工具,有利于促进云制造服务平台资源的安全使用,是云制造领域已有研究工作的延伸和技术扩展.     

云制造典型特征、关键技术与应用

在近两年来云制造理论研究、技术攻关、工程实施与应用示范的实践基础上,进一步讨论云制造的内涵,提出云制造的典型技术特征,即在数字化的基础上,具有硬软制造资源和制造能力的＂物联化、虚拟化、服务化、协同化、智能化＂,以实现全生命周期制造的智慧化;进而分析了云制造与制造信息化和云计算的关系。基于对云制造典型技术特征的分析,进一步讨论了支持这些特征实现的技术体系与关键技术;给出了正在实施的面向集团企业和中小企业的四个典型案例,最后对云制造的进一步工作提出几点建议。     

依托产学研资源构建云制造服务平台研究

通过分析云制造服务平台在实际开发过程中遇到的资源管理方面的难点,提出依托产学研联盟的固有资源构建服务平台的方案,以降低云制造应用系统在资源管理服务方面的开发难度,提高资源服务的稳定性和可靠性;设计了依托产学研资源的云平台总体服务模型,阐述了云平台的构建方案及各功能模块的开发思路;最后,依托某产学研联盟的资源库建立并试运行了面向机械制造业的云制造管理系统,实现了一定的云服务功能,对服务效果进行了总结评价,为云制造的市场化建设实施做了有益尝试。     

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.     

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.