现代物流环境下电子标签拣货系统的设计与实现

近年来,电子标签技术在现代化仓库管理中获得大量的成功应用.研究了现代物流环境下基于电子标签的拣货系统的工作原理及分拣系统的硬件组成结构,基于摘取式和播种式两种货品分拣模式,分析设计了分拣系统的基础数据管理、订单制订、订单执行与控制以及库存补货、盘点作业、库位报警在内的功能模型和数据库模型,最后基于VB与Oracle数据库实现了分拣系统.实践证明该拣货系统能有效的进行货品分拣管理、订单管理与控制,提高货品分拣的效率,降低库存管理的成本.     

运用聚类算法的订单归并模型研究

针对面向订单的生产管理问题,建立一套订单管理系统,对订单统一管理.在此基础上,深入研究订单归并模型,提出基于交货期和加工工艺的订单归并聚类模型,保证工件的准时交货和加工流程的统一化.实际生产时,对归并订单进行细化分组,相似加工尺寸、同名称和同型号的工件分为一个子订单,减少加工设备的调整次数,提高生产效率.该系统在某重型...     

面向离散型生产模式的MES系统研究

随着我国航天事业的快速发展,航天产品任务大幅增加,对生产企业的订单交付能力提出了更高要求,亟需通过信息化手段来提升车间管理能力。针对航天企业离散型生产车间多品种、小批量生产模式,分析了该模式下生产车间的特点,梳理了产品生产典型业务流程,建立了MES系统功能模块框架。介绍了MES系统基础数据管理、生产准备、生产执行、统计分析功能模块;重点介绍了订单分批技术及质量预测技术2项关键技术。采用Java EE技术平台开发了面向航天企业离散型生产车间的MES系统,并在某航天企业车间得到应用。实现了订单全流程管理,生产过程数据可监测及多维度统计分析,系统与其他信息系统无缝集成,实现了数据的共享。通过系统实际运行,有效提高了车间的生产运营效率。     

数控加工车间的集成生产计划与控制模式研究

针对传统的数控加工车间的生产计划与控制模式的弊端,构建了一种基于TOC的MRPⅡ生产计划系统和JIT生产控制系统相结合,同时考虑资源约束和订单插入的集成生产计划和控制模式.该模式能以生产需求、JIT拉动与APS模拟排产相结合的方式进行生产计划排产,同时利用车间能力需求计划、看板系统和PDM技术对生产过程实施实时跟踪控制.此模式对数控加工车间的生产效率提高具有重要意义.     

基于Web数字化生产车间的运行状态监测系统

为了提高制造系统的运行效率和透明度,研究开发了基于Web数字化生产车间的运行状态监测系统,实现了对现场生产过程中各种生产状态信息的采集与管理.在工业自动化基础上,该系统通过Web使生产实时数据能够直接到达生产监测、管理与控制等环节,从而实现数字化生产车间的自动化管理.系统采用B/S构架的软件开发模式,实现了灵活的信息采集与管理.     

WinCC VBS脚本在聚氨酯板生产线订单和报表管理系统中的应用

针对目前在聚氨酯板生产线订单和报表管理系统中存在的一些问题,设计了新的生产线订单和报表管理系统,提出利用系统使用的WinCC软件中集成的VBS脚本编写SQL语句来解决原系统存在的问题,结合项目具体要求,通过VBS脚本编写SQL语句,完成了对生产线订单和报表系统的设计实现,该系统在生产线的应用,提高了生产效率,方便了生产线的高效管理和合理安排生产。     

基于ASP的中小企业订单执行系统的研究

当前大多数中小企业采用的是订单制生产模式,基于ASP(应用服务供应商)的中小企业订单执行系统,是以工作流管理的方式对订单执行过程进行管理的系统.对订单执行过程进行详细分析,并给出流程图;阐述系统实现的关键技术,对权限管理策略和数据库管理策略进行详细说明.     

基于ISA-95的离散制造生产能力建模

为解决业务—控制集成制造系统中的生产能力数据获取和建模问题,面向复杂离散制造过程,在分析ISA-95标准生产能力模型的基础上,提出在组织、日历、资源三个维度上扩展的生产能力空间模型.使用企业制造建模语言对模型架构进行定义,用于系统集成时的信息交换.针对ISA-95标准生产能力模型仅定义了资源的资格能力属性,给出了基于扩展模型组织维度的自底而上的生产能力层级核算方法,对每一层级的核算公式进行定义.以采用面向订单装配生产策略的某车辆生产企业为例,对生产能力模型和核算方法进行验证.面向订单装配生产环境下,生产能力是订单承诺能力核算的重要数据.生产能力信息由控制系统及时、准确地反馈到业务系统,有助于提升业务系统计划与决策的可靠性和准确性.     

基于流程控制的纺织生产管理系统可重构设计

针对目前中小纺织企业存在的生产管理问题,提出了一种可重构的纺织生产管理系统设计方案,该系统包括流程控制和生产物料计划等模块。针对纺织生产基于流程控制和面向订单的特点,提出了流程节点模块化和订单信息抽象化的设计模型,并建立了业务注册机制,实现了流程控制模块的重构;节点模块化将流程步骤封装为处理单一事务的模块单元,订单抽象化将订单生产相关信息整合为通用元素集合,实现了业务内容与系统框架的松耦合;结合企业开发框架Jboss Seam和工作流引擎jBPM加以实现。研究结果表明,该设计方案可以较好地实现系统的重构性,便于系统的改进和移植。     

汽车总装电子电气订单生产信息系统设计实践

通过对整车电子电气系统总装阶段工业化的特点的分析,确定了大量总装电子电气订单生产信息对于总装现场生产活动的必要性。设计建立了适应现场需求的汽车总装电子电气订单生产信息系统,并包含条码式车辆识别和在线实时无线数据导入两个子系统。本系统的建立实施不但满足了总装电子电气工艺领域的单件订单化生产的要求,大大提高了生产效率和生产一次合格率水平,而且保证了企业产品的高质量、多样化且可追溯,大大提高了其市场竞争力。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.