业务协同中组织需求的建模与一致性验证

验证协同业务过程与参与组织期望需求的一致性是协同业务过程设计阶段需要解决的一个关键问题。基于模型检测技术提出一种需求一致性检测方法。通过扩展经典目标模型,提出需求依赖图来建模参与组织需求;引入并发操作符来提供一种通过组合业务过程构建协同业务过程方法,并定义了其执行语义以支持需求一致性验证;基于模型检测技术提出需求一致性验证框架。对协同制造中采购订单进行建模,并与现有典型方法进行对比分析,结果表明相对已有工作,所提方法能够更有效地对跨组织环境下需求一致性检测进行建模和分析。     

支持跨企业网络化协作的企业模型研究

企业间的协同和集成需要一个能够描述跨组织业务过程的企业模型的支持.从分析跨企业业务过程管理框架出发,导出面向多企业协作的企业模型框架.该模型框架的核心为协同过程模型,它用来描述合作业务的执行控制,并集成其它视图的信息;在纵向上又分为项目决策层、协作层和执行层三个逻辑层次.之后,分析和描述协作层和执行层中各个视图模型的内容.并以新的视角研究了面向跨企业集成的功能模型、组织模型、产品模型、资源模型和信息模型的建模方法.     

基于事件-状态-过程规则的跨组织工作流协同方法

目前跨组织工作流协同建模时,各个组织内业务模型的独立性和隐私性较差,"全局"协同模型的柔性不好,且缺乏描述协作活动之间细粒度操作语义.依据协调理论的思想,提出了一种基于事件-状态-过程规则的跨组织工作流协同方法,其核心是采用事件状态-过程规则形式表达的协同工作流来控制和协调多个组织内业务流程的运行.该方法中的业务工作流程仅曝露需要交互的活动,从而保证了其独立性和隐私性.同时,协同工作流由一系列具有细粒度操作语义的协同活动组成.并且基于事件-状态-过程规则的形式,可进行灵活的定义和删除,具有较好的柔性.     

基于Agent和工作流的跨企业协同制造支持系统

通过分析跨企业协同制造业务过程,提出基于Agent的柔性工作流驱动的跨企业协同制造支持平台,其核心是一组自主交互的智能Agent,通过Agent之间的协作实现协同制造任务建模、制造任务动态调度与分配、制造资源管理及制造过程管理等功能。讨论了系统结构设计、关键技术及系统实现,并以航空发动机企业间协同制造为例进行验证。系统表现了较好的模块化特性、柔性和开放性,并可能在敏捷供应链及扩散制造方面获得进一步应用。     

一种多视角的跨组织业务过程建模方法

为有效支持传统的组织内业务过程的建模方法,采用多视点的思想,秉承关注点分离的原则,使用Petri网,提出一种多视角的跨组织业务过程建模方法。该方法以自底向上的方式,从内部视角、公共视角和协作视角三种视角对跨组织业务过程的不同方面进行描述,得到私有过程、公共过程、协作过程三种不同的过程形态。使用该方法对供应链的购买过程进行了建模说明,与现有建模方法相比,说明该方法可有效支持跨组织业务过程的个性化特征。     

参与组织需求与协同业务过程一致性验证方法

为了验证协同业务过程与参与组织需求保持一致,基于模型检测技术提出一种需求一致性检测方法。首先,扩展并沿用目标模型思想,提出一种声明式需求描述语言来描述参与组织需求;然后,引入并发操作符,提供一种通过组合参与组织业务过程构建协同业务过程方法,并定义其执行语义以支持需求一致性验证;最后,基于模型检测技术提出需求一致性验证框架,实现需求一致性自动验证。通过对协同制造中供应链建模并与现有的、典型的方法对比分析,结果表明:相对已有的典型工作,所提方法能够更加有效地支持需求一致性验证。     

薄壁铝合金结构焊接应力变形数值模拟

实际结构焊接过程的三维数值模拟因为计算量大而往往难以进行。为了采用三维热弹塑性有限元方法对薄 壁铝合金结构的焊接过程进行数值模拟,提出了粘贴单元和混和单元两种网格划分技术相结合的单元划分方案进 行有限元建模,通过薄板对接模型试验验证了此方案的可行性,并研究了不同建模方案对计算效率的影响。将这 种单元划分方案应用到实际薄壁筒体结构焊接过程的数值模拟中,对焊接过程产生的残余应力和变形进行了成功 地预测。结果表明:对于薄壁构件,采用粘贴单元和混合单元相结合的单元划分方案可以在保证一定精度的前提 下,可大大减少有限元网格划分工作量,同时可降低计算规模,提高计算效率。     

基于UML的ASP业务过程建模

传统业务过程模型主要应用在企业建模领域内,是企业内部业务规则和过程的静态描述,不适合表达动态变化的跨企业分布式的应用服务提供商业务过程。将面向对象技术的统一建模语言方法应用到应用服务提供商业务过程建模中,建立起跨越多个企业的应用服务提供商业务过程模型,以此为基础开发了一套基于应用服务提供商平台的分布式业务过程管理系统。经验证,该模型能有效地描述和管理应用服务提供商业务过程中的复杂业务规则和数据,体现了应用服务提供商业务过程的开放式、可重组和业务数据挖掘能力。     

基于本体的航天产品性能样机协同建模方法

针对目前性能样机的定量描述和建模理论与技术尚不成熟等问题,根据系统工程综合集成方法和性能样机的性能验证过程,对性能样机功能的划分和设计流程进行了分析。在对性能样机协同设计仿真业务进行需求分析的基础上,结合本体建模方法提出一种基于本体元模型的性能样机协同概念建模方法。以某超声速飞行器协同建模为例,给出性能样机协同概念建模案例,并采用Protégé工具构建了性能样机的本体元模型库,较好地解决了多学科产品模型的输出缺失和信息冗余问题,可以显式地表达领域知识并促进不同领域之间概念的语义一致性。     

锥形件强旋成形有限元建模关键技术研究

根据锥形件强旋成形特点,基于ABAQUS软件对锥形件强旋成形有限元建模仿真的关键技术进行了深入的研究,主要包括几何建模、材料属性设置、单元选取、网格划分和边界条件处理等关键技术,并通过理论评估与实验对比对该模型进行了可靠性验证。验证结果表明:上述关键技术的合理处理大大提高了有限元模型仿真模拟结果的精度和效率,从而为锥形件强旋成形过程的优化设计和精确控制提供了重要的基础平台。     

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.