基于协同管理的单件小批生产管理系统的实现

本文针对多品种小批量生产的特点,讨论了某制造企业在生产计划编制、动态生产调度、资源受限、生产执行情况反馈等方面存在的问题,在深入分析了生产计划、生产调度和多资源(工艺、物料、工装、设备、人员等)约束等有关的生产管理流程的基础上,提出了生产管理业务模型、数据模型和多资源生产调度机制,采用J2EE多层体系架构和构件开发技术,提供了生产任务管理、生产计划编制、动态生产调度、生产资源平衡配置和计划调整追踪等功能.该系统在纵向上集成了ERP和MES的部分功能,同时提供与PCS的接口,横向上提供与CAPP和PDM的接口,具有良好的扩展性,服务于实际生产,实现了生产过程的分级管理和协同共享.     

制造业生产调度体系的研究

面对客户随机需求,制造业生产调度系统应促进生产的快速性、动态性和敏捷性.以制造业生产调度体系为研究对象,从生产车间调度的目标、方法、手段、资源等基本要素入手,总结了传统生产调度系统在实际生产中的问题,并概括了系统集成视角下的生产调度方法.运用系统集成的思想,探讨了供需链环境下的制造业生产调度系统模式,最终提出了生产调度系统的集成化、动态化、高效智能化、柔性化和排程可视化等发展方向.     

汽车工业与装备工业的协同发展联合创新

当前,汽车生产呈现出四个方面的特点:一是生产的多品种、系列化、混流生产;二是大批量集中生产:三是生产的车辆换型快,车型的平均生产寿命缩短;四是新产品的生产准备周期缩短,投放市场的进度加快.要适应汽车工业的生产特征,汽车生产与装备技术的关系体现在三个方面.第一,装备是汽车生产的工艺手段,汽车的制造水平和质量,取决于装备的技术水平.     

汽车零部件实施绿色生产的物流模式

研究了绿色生产物流的内涵,包括基本内涵和战略内涵。针对汽车零部件企业生产物流的特点,从生产物流各个环节的绿色化以及生产物流系统的绿色优化、管理、控制、评估等方面探讨了汽车零部件企业实施绿色生产物流的主要途径。提出了一种汽车零部件企业实施绿色生产物流的模式,该模式基于产品数据管理PDM,研究了生产物流的绿色规划模块、绿色控制模块和环境影响评估模块,以及绿色生产物流数据库系统;其在生产物流中的应用对推动我国汽车零部件企业车间生产的自动化、信息化进程具有重大意义。     

面向规模化生产的小尺寸产品总装生产线技术研究

为满足新时期航天产品规模化生产任务需求,提升航天产品总装安全生产水平,针对航天产品手工为主作业的传统生产模式开展生产线建模仿真、物料齐套及配送管理、柔性工装设计等技术研究,创新生产模式,结合某小尺寸产品构建面向规模化生产的总装生产线,满足安全生产要求,显著提高航天产品总装生产的自动化、数字化、智能化水平。     

基于卷烟牌号的卷包车间综合监控系统设计及应用

由于卷包车间各子系统较多,网络结构错综复杂,造成车间生产可视化困难。为此,以厦门烟草工业有限责任公司“金桥”卷包综合监控系统为例,从卷烟生产牌号的流程出发,介绍该系统的系统结构、网络架构,并针对虚拟生产线、“即插即用”等关键技术进行了详细说明。该系统将原本离散的生产单元串在一起,实现了生产任务调度、生产实时监控、生产数据信息管理、生产信息发布等功能,操作简单,界面清晰,为卷包车间的可视化生产提供了良好的平台,确保生产的有序和可控。     

制造业生产调度体系探讨

论文以制造业生产调度体系为研究对象,从生产车间调度的目标、方法、手段、资源等基本要素入手,总结了传统生产调度系统在实际生产中的问题,并概括了系统集成视角下的生产调度方法及其改进措施,介绍了不确定条件下生产调度策略及评价指标;运用系统集成的思想,探讨了供需链环境下的制造业生产调度系统模式,最终提出了生产调度系统的集成化、动态化、高效智能化、柔性化和排程可视化等发展方向。     

集成化生产计划管理与控制模型

通过分析、比较制造资源计划、准时化生产、约束理论3种生产管理思想的优缺点和适用性,并根据生产计划与控制的不同层次需求,将制造资源计划、准时化生产、约束理论三者加以融合,提出了一种新的生产管理方法——MTJ,并在其指导下构建了生产计划管理与控制模型。在此模型中,制造资源计划定位在厂级或企业级,负责主生产计划、物料需求计划及各车间零部件的月、周计划;约束理论定位在车间级,负责车间或工段工序的日作业计划与调度、物料的投放;准时化生产定位在生产现场,负责作业计划的执行、生产的控制和现场的反馈。对本模型的运作逻辑以及本模型如何利用制造资源计划、准时化生产、约束理论三者的优点和规避其缺点进行了讨论。     

生产计划与调度系统在卷烟生产中的应用

针对企业计划层和生产控制层之间的断层问题,阐述了制造执行系统(Manufacturing Execution System)在烟草行业的应用,并就其中关键模块-生产计划与调度系统进行了详细介绍,包括制丝生产计划制定、卷包生产计划制定、生产通知单派发、制丝生产过程控制、卷包生产过程控制等功能模块,并对系统的实现和应用效果进行了介绍.     

油田生产指挥中心软件架构设计与实现分析

为实现大庆油田"数字油田、智能油田、智慧油田"三步走战略部署,促进油田管理提升,助力油田稳健发展,设计并实现了大庆油田生产指挥中心软件平台.该平台主要包括可视化综合展示平台、数字化生产管理平台和生产指挥移动端平台,实现了生产动态、产能运行、生产管理、生产保障、运行监控、报警预警、调度运行、应急管理、万物共享9大功能模块...     

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.