产品服务化供应链信息共享激励的博弈分析

产品服务化供应链信息共享能够减少企业之间的信息不对称所造成的不良影响。但是,企业参与供应链信息共享是需要付出成本的,可能会出现收益和投入不成比例的情况,造成部分企业不愿意参与供应链信息共享,这就需要建立一种激励机制来促使企业主动参与供应链信息共享。分析了产品服务化供应链信息不共享的原因,建立了产品服务集成商主导的产品服务化供应链两级合作的信息共享激励的博弈模型,并作均衡分析。然后,给出一些产品服务化供应链信息共享的激励策略。最后,通过实例说明了该模型的可行性。     

基于成本信息选择性共享的资源联盟

以供应链中的两个供应商与一个服务企业为研究对象,将企业的价值单元信息细分为私有信息与公共信息,建立利用私有信息与公共信息的效用模型.在Lotka-Volterra模型基础上,建立成本信息扩散模型,运用该模型并结合效用模型,研究了供应商与服务企业的信息共享决策过程.研究表明,供应商披露低效率和非核心的价值单元成本信息,可实现成本信息的选择性共享,更易与服务企业共同形成资源联盟,从而优化企业价值链配置.最后,结合示例进行了验证.     

面向复杂产品协同优化的构件化分析方法研究

提出基于构件化分析技术的复杂产品协同优化设计方法。该方法以分析元作为优化的基本单元,复杂产品分析元的性能目标作为优化约束,建立分析元优化、产品优化的多层次优化模型,实现各层次对信息和资源的共享,为协调处理各种耦合和冲突,为实现复杂产品协同优化设计提供了模型映射方法。最后,以锤式破碎机主轴为具体的应用实例,充分验证该方法在复杂产品设计开发过程中的实用性和技术可行性,有效提高了企业设计开发能力。     

基于工艺模型的工艺信息表达与管理技术

针对机加工三维工艺规划系统对工艺信息进行有效表达和管理的需求,提出以工序间模型为载体实现简便有效表达和管理工艺信息的方法。分析了零件加工过程中的工艺信息,并将其分为静态工艺信息和动态工艺信息;定义了三维工序间模型并确定工艺信息在该模型上的表达方案;利用工艺信息的结构层次关系实现对工艺信息的有效管理,构建了工艺管理器对工艺信息进行组织与存储;将所提工艺信息表达与管理技术集成到三维工艺规划系统中,并以创建零件加工过程中的三维工艺模型为例,验证了所提工艺信息表达与管理技术的有效性。     

机械产品概念设计BFBS混合映射方法

为实现结构到功能的映射,提出一种行为-功能及行为-结构混合映射的方法.在定义行为模型、基本功能体和元功能的基础上,对行为、基本功能体和元功能进行详细分类,然后根据行为、功能和结构间七种基本映射类型,以行为作为中间过渡信息连接结构和功能,通过基本映射类型在行为、结构和功能间的反复混合映射,将产品结构与产晶功能紧密联系.最后由元功能对基本功能进行合并,根据合并过程所获得的功能组织结构,完成对产品各部分的理解,达到结构到功能映射的日的.通过在摩擦驱动装置分析中的应用,验证了该方法的有效性和实用性.     

基于典型工序MBD模型的工艺路线决策研究

为了提高三维数字化制造工艺设计智能化水平,简化工艺路线决策过程,提出一种基于典型工序MBD模型的工艺路线决策方法.在制造特征分类的基础上构建了典型工序MBD模型,该模型融合了工艺决策规则、加工方法、机床和工装等工艺信息.通过加工特征与典型工序MBD模型匹配,减少了工艺决策步骤.为保证工序安排的合理性,定义加工元为最小信息实体,通过加工元的合并、排序,得到最优工艺路线.以飞机双面大框结构件的三维数字化工艺设计实例验证了所提方法的有效性.     

基于三维轻模型的装配工艺与产品设计信息集成

为解决装配工艺设计系统与其他系统间三维模型信息交换和共享的问题,提出一种基于三维轻模型的产品制造信息集成方法。通过分析数字化装配工艺设计对装配模型的信息需求,在此基础上构建基于轻模型的装配工艺信息模型,利用统一的形式描述产品设计三维模型信息、装配工艺信息及其之间的关系,建立实体几何模型与轻模型所表达的产品及装配信息之间的映射,实现各系统间的信息共享与集成,为装配工艺设计提供完善的信息支撑。通过一产品设计系统与装配工艺设计系统的集成实例验证所提出方法的可行性和有效性。     

基于BOM的CAD/CAPP/MES集成研究

针对企业信息化进程中出现的信息孤岛问题,研究了在产品设计、工艺和制造阶段不同的物料清单视图及其转化,并在此基础上研究了CAD/CAPP/MES系统的集成,给出了集成框架和集成系统的部分数据库模型.该系统能实现制造信息在企业内不同部门间的信息集成和共享,提高企业的整体效益.     

面向多学科协同开发领域的集成建模方法

为实现复杂产品研发过程中不同学科的信息共享,消除系统集成、协同仿真和系统优化的障碍,提出了基于本体元模型的数字化样机构建方法.分析了基于本体元模型的多领域集成建模的可行性,利用统一建模语言的扩展模型构建了本体的元模型核心包;基于本体理论分析了复杂产品协同开发领域的概念及其关系,构建了多学科协同领域信息集成框架;基于本体元模型建立了涵盖产品定义信息、研发方法信息和研发流程信息的数字化样机模型,支持产品在研发过程中的多抽象层次演化、多粒度层次分解和多学科协调优化,控制复杂产品的整个研发过程.以有源相控雷达为例对所提方法进行了说明.     

基于元模型的统一制造资源模型框架

为解决企业多应用环境中的制造资源集成问题,提出了一种制造资源元模型,进一步给出了统一制造资源信息模型框架结构,应用基于面向服务架构和可扩展标记语言技术,建立统一制造资源服务平台,实现了该框架的构建.制造资源元模型由数据元模型、应用元模型、扩展元模型三部分构成,统一制造资源信息模型框架由资源核心模型层、资源应用模型层及资源整体战略模型层构成.通过对统一制造资源信息模型的分析,说明了该制造资源模型的可集成性与可扩展性.     

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.