云制造服务平台供需智能匹配的研究与实现

为提高中小企业云制造服务平台搜索引擎的实用性,在保证其搜索智能度和搜索精度的同时,基于云制造服务模式和思想,开发了一个面向中小企业云制造服务平台的供需智能匹配引擎。采用关键字语义智能搜索,使用制造服务资源本体库,根据需求本体构建形式化的需求匹配模式,进行了制造服务资源的智能匹配算法。在汽车/摩托车配件行业进行了验证性应用,通过"骨架法"构建汽车/摩托车配件本体库,完成了该服务资源本体语义推理,实现了云搜索的有效、快捷智能匹配。     

基于SLA的中小企业云制造服务平台

为保障云制造服务平台的质量,在中小企业云制造服务平台基础上,对服务等级协议(SLA)的签署流程、云制造SLA的协商模版以及基于SLA的平台性能管理进行了研究.提出了SLA、云制造SLA签署流程,并基于云制造理论给出了云制造的服务质量(Quality of Service,QoS)属性及量化计算公式,为用户请求的服务选择一个适合度最高的物理服务.构建的基于SLA的中小企业云制造服务平台对推动工业化和信息化的融合发展、提高中小企业综合竞争能力具有参考价值.     

面向中小企业的云制造服务模式研究

云制造是近年来提出的一种面向服务、高效低耗和基于知识的网络化智能制造新模式。它融合了现有的信息化制造、云计算、物联网、语义Web、高性能计算等技术,我国中小企业普遍存在资金少、规模小、企业信息化程度低等问题,云制造服务平台能有效加以解决。通过对系统集成企业传统的新产品开发设计方法等进行研究,构建了面向云制造的零部件设计选型模式,提出了相应的零部件交易模式,设计了基于云制造的零部件设计选型与交易服务平台的运营主体、服务内容、盈利机制以及平台运行机制,为云制造服务平台实施和推广应用奠定了基础。     

基于区块链的制造服务可信交易方法

云制造模式下,制造服务交易过程中的供需双方信任问题亟需解决。区块链作为一种分布式共享总账技术,其发展得到了产业界和学术界的广泛关注。针对当前云制造服务平台制造服务交易过程中存在的安全和信任问题,提出一种基于区块链的制造服务可信交易方法,重点研究多链数据存储架构、动态QoS评估方法和共识算法设计等关键技术,设计了基于智能合约的制造服务匹配及交易流程。实验结果表明,基于区块链的制造服务可信交易方法在保证交易信息的开放性、安全性以及企业信息的隐私性的同时,可以自适应地完成制造服务组合与资源匹配,有效提高云制造服务平台的可信度和系统的整体效率。     

基于RS与AHP的中小企业云制造模式下多服务主体信用评价体系构建

云制造模式下中小企业制造服务交易模式呈现出多主体、动态的特点,各服务主体信用评价也较B2B等电子商务模式不同,具有更高的复杂性与不确定性.为此,基于信用风险理论与服务科学理论建立云制造模式下中小企业信用评价指标体系,包括中小企业平台接入信用资质评价与面向服务交易的信用资质的实时动态评价;引入粗糙集和层次分析法混合评价方法,构建全面、科学、有效的多主体信用评价体系.指导开发了中小企业云制造服务平台信用评价模块,面向汽车模具产业链上的中小企业信用评价实例,验证了方法的科学性与有效性.     

基于服务编排的云制造服务协同

制造产品价值创造已演变为跨组织的协同,基于业务流程执行语言等服务编制的方法难以应对多主体、多样化和动态化的服务组合流程管理需求。提出了一种基于WS-CDL的云制造服务编排方法,对云制造服务协同流程进行预先定义并在执行过程中遵照执行。通过设计信息交互接口规范和扩展WS-CDL协议,实现云制造服务协同的标准化描述,促进跨组织服务之间的有效沟通。通过仿真对比验证了服务协同方法能改善服务执行效率,提高服务供应商的资源利用率。     

中小企业云制造服务平台共性关键技术体系

为了给我国广大中小企业充分利用和共享社会制造资源、提升企业综合竞争能力提供重要支撑手段,分析了中小企业云制造服务平台的特点,建立了中小企业云制造服务平台共性关键技术体系框架,阐述了中小企业云制造服务平台的主要核心理论和技术、平台标准和规范、平台体系架构、平台共性引擎和共性管理工具、平台服务和运行模式、平台应用体系架构等共性技术方面的研究思路和研究内容,为进一步深入和系统开展中小企业云制造服务平台的研究、开发、实施和应用奠定了基础.     

面向制造及管理的集团企业云制造服务平台

单纯的制造向服务化制造转变是未来企业的发展趋势.为支持这种转型,通过有效的资源整合解决转型阶段波动的订单需求与持久性制造能力之间的供需矛盾,提出了面向制造及管理的集团企业云制造服务平台.以中国北车股份有限公司为例分析了当前集团企业的资源和需求特征,提出了云企业及云制造服务的概念,通过资源整合、需求整合和按需优化配置实现了制造过程服务化和管理过程服务化.分析了面向制造及管理的集团企业云制造服务系统、云制造服务平台及相关的体系结构与核心技术.最后,指出通过此服务平台的应用,能够支撑集团企业实现从制造型企业向制造加服务型企业的产业转型.     

模具行业需求驱动的云制造服务平台

为研究云计算技术如何落地,如何促进工业化的问题,分析了我国模具行业存在的问题、需求及其原因,提出模具行业云制造服务平台、系统和关键技术。利用云计算技术支持模具零件库和知识库建设、企业诚信协同管理、协同设计和制造、协同维修服务和信息技术服务;将模具行业云制造服务平台的建设作为社会技术系统进行研究,建立多种形式的联盟,保证平台和系统的成功实施;面向模具价值链的全过程,帮助模具企业向服务业拓展,向产业上下游拓展。建立了模具行业云制造服务平台原型,提出了模具行业云制造服务平台的发展愿景和模式。     

基于云制造的起重机协同设计与制造模式

综合分析网络化制造、制造网格、制造服务平台与云制造的特点,云制造具备三种传统制造模式所缺少的优势。本文将云制造模式引入工程机械中的起重机行业,借鉴基于云计算的服务系统三层结构构建了基于云制造的起重机协同设计与制造模式,并详尽地阐述了该模式中各层的组成与作用。分析了起重机从设计到制造的整个流程,最后分析了基于云制造的起重机协同设计与制造模式的案例。云制造的引入,将大大提高起重机设计与制造的效率。     

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.     

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....     

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.