面向服务的基于元模型的统一制造资源建模研究

为了解决网络化环境下多应用系统中制造资源集成的问题,提出了一种面向服务的基于元模型的制造资源模型。该模型从基础数据、业务过程、应用扩展三个方面对制造资源进行抽象,并引入情境元类,从元概念、元属性、元关系三个方面对制造资源信息模型进行表达。分析了元模型的扩展机制,给出了统一制造资源信息框架,并利用面向服务的相关信息技术,建立了一个可扩展、可集成的面向服务的数字化制造资源管理平台。     

基于ISA-95的管控一体化数据交换模型研究

基于标准的互操作是未来解决生产和业务系统集成成本高和难以实现等问题的良好解决方案.ISA-95标准制定了拥有语义独立性和稳定性的数据交换B2MML规范,为企业应用系统提供了语义集成的支持.基于Web Service、XML技术标准、ISA-95业务标准提出了一种企业管控一体化数据交换模型,对模型中间层的中间格式进行了详细研究.最后以线束行业为例分析了遵循B2MML规范制定企业应用系统间数据交换中间格式的方法.     

云制造环境下模具加工制造资源共享技术研究及平台开发

针对传统模具企业生产周期长、资源少、设备利用率不高,不同区域企业间缺乏沟通与合作,制造经验知识得不到积累传承等问题,引入云制造模式,对模具制造资源进行定义并分类,构建模具企业面向客户订单的制造资源共享过程模型,并建立模具制造资源共享云服务资源库,开发面向模具加工的智能制造云平台系统。结果表明：各加盟企业获取模具订单途径更加多样化,生产制造方式更加丰富化,获取行业信息更加方便,有利于企业之间的供需撮合,提高企业竞争力。     

MTO环境下订单跟踪系统研究

客户定制化和代工生产企业,按照客户订单组织生产。为控制订单交货期、生产进度和产品质量,需要对订单进行系统跟踪。本文首先对订单跟踪所需的订单、制造过程、组织模型进行研究。然后在订单跟踪功能和内容研究的基础上,提出了面向离散制造、适合MTO(Make-to-Order,面向订单制造)环境下的订单跟踪系统框架,并对系统实现关键技术进行说明。最后,应用案例验证了模型、系统框架的有效性。     

基于SP95标准的工厂模型设计与建模方法研究

为解决当前数字化工厂模型所存在的实时性不强和集成性不足等问题,提出了使用管控系统间集成通用标准-SP95标准进行数字化工厂建模.在应用SP95标准对工厂模型进行定义和描述的基础上,结合国内离散企业中的实际情况,提出了一种扩展的工厂模型.该模型在SP95标准的基础上扩展了料架和变量两个元素,并介绍了其实现方式和作用.通过SP95标准提供的功能,扩展了基于可扩展标记语言技术的制造标记语言的Schema结构,为业务系统集成提供统一的数据共享格式.最后给出了一个构建工厂模型的实例,验证了所提出的模型.     

集成的装配工艺文件管理平台

制造业的全球化、信息化要求装配工艺过程能够基于Internet共享工艺信息。本文首先制定了一套装配工艺文件标记语言APFML作为装配工艺的数据结构标准。APFML利用Schema结构定义标记集和XSL显示模板建立装配工艺的信息模型,与工艺数据一起通过Internet在系统之间传递。然后在分析装配工艺文件处理流程的基础上,提出了一个基于Internet集成的装配工艺文件管理平台。该平台使用APFML语言,采用浏览器 /服务器体系结构,是一种面向计算机集成制造和网络化分布制造的快速而低成本的装配工艺信息交换平台。     

基于PSL的制造过程信息模型研究与应用

为满足制造企业在产品全生命周期管理中对于制造数据定义一致性、模型可重用性以及服务互操作性的需要,提出了以"过程"为核心组织定义数据,并基于PSL思想构建制造过程信息模型,包括规范的过程定义以及面向系统实现的对象模型构建.     

利用S95模型集成企业ERP与控制系统

S95为信息交换提供了标准,减少了MES-ERP集成的费用,与产品的生命周期管理协同工作,提供生产能力和状态,提高了生产制造的灵活性,提供了一套信息集成的架构和标准模型,定义了ERP和MES的界限和信息流。     

基于仿生原理的网络化制造资源模型定义和应用研究

应用神经元仿生学原理，构建多层结构的制造资源组织模型。通过细胞、逻辑神经和知识网络实现对制造资源信息、面向功能的制造资源组织逻辑和面向制造应用的制造资源应用知识的描述。为制造资源的应用、制造资源检索和用户需求求解以及异地制造资源信息集成提供支持。基于XML定义了制造资源标注语言MRML，研究了基于制造资源模型和制MRML的制造资源应用的相关技术，在上述研究的基础上，实现了制造资源信息的集成、信息挖掘、资源重构、数据重用等制造资源应用。     

面向现场装配的产品装配工艺模型表达与管理方法

针对面向现场装配的工艺信息完整准确表达与高效管理的应用需求,提出以三维装配过程模型为载体实现面向现场装配的产品装配工艺模型表达与管理方法.分析了面向现场装配的产品装配工艺信息变迁特点,明确了从产品预规划装配工艺信息向现场实际装配工艺信息的实例化映射规则;定义了三维装配过程模型与装配工艺信息数据集,并确定了工艺信息在该模...     

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.