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1.
针对云制造环境下机床装备制造服务的共享和集成,在分析机床装备云制造服务建模的特点及需求的基础上,提出一种基于机床装备资源层、机床装备服务语义描述层和机床装备服务实现层三层结构的机床装备云制造服务建模实现框架,基于该框架对机床装备制造资源分析、机床装备制造资源语义描述和机床装备制造服务实现进行研究。通过对一类机床进行云制造服务建模,验证了该建模方法的可行性及有效性。  相似文献   

2.
考虑中小型农机装备制造企业面向智能化、网络化、服务化制造转型的必然趋势,结合目前中小型农机装备制造企业现状以及基于网络的原材料采购、加工资源共享和农机售后维修等需求,建立一种农机装备云制造服务平台的体系架构,探讨其平台运行模式,并对平台服务业务流程及任务分解和服务优选关键环节进行研究,最后初步建立中小型农机装备云制造服务平台进行验证。  相似文献   

3.
服务型制造是大型装备企业转型的趋势,为了更好的支持这种转型,实现异构、异域环境下的业务协同,促进企业形成差异化竞争优势,本文研究了以大型装备企业为核心的服务型制造协同平台。探讨了大型装备企业服务型制造运行模式,基于SOA理念以及支撑技术构建了面向服务的、松散的服务型制造协同平台架构,研究了平台涉及到的关键技术,如资源服务化封装技术、制造服务分类、服务匹配和组合技术。结合实例对平台进行了开发,这为大型装备企业服务型制造实施提供技术支撑。  相似文献   

4.
为支撑云制造服务模式在制造行业的推广应用,以及企业从传统生产型制造向服务型制造转型,在分析当前广大企业面向服务的生产制造过程管理需求的基础上,提出了下一代制造执行系统的发展方向——面向生产过程云服务的制造执行系统(CloudMES)。分析了CloudMES的总体实现思路,构建了一种CloudMES的体系架构和运行模式,并对CloudMES系统涉及的车间机床装备资源的智能感知与网络优化配置、基于移动智能体的机床装备资源服务化封装等关键技术进行了研究。通过初步试验验证了所提系统的有效性。  相似文献   

5.
随着现代制造业竞争的日趋激烈.制造企业对维护与提升机床装备能力的需求越来越迫切,这对广大的制造企业特别是中小制造企业,正形成严峻的挑战。为此,本文提出了一种“机床综合再制造服务新模式”。服务型企业针对客户企业机床装备能力维护与提升需求,形成包括机床维修与升级、废旧机床再制造、机床以旧换新、机床厂家特约集成维修等功能的机床综合再制造服务模式。本文所提模式已在某制造服务型企业初步实践,取得了很好的应用效果。我国机床拥有量世界第一,机床综合再制造服务产业不仅自身是一个巨大的产业,而且对现代制造业机床装备能力提升具有重大作用。  相似文献   

6.
随着现代制造业竞争的日趋激烈,制造企业对维护与提升机床装备能力的需求越来越迫切,这对广大的制造企业特别是中小制造企业,正形成严峻的挑战。为此,本文提出了一种"机床综合再制造服务新模式"。服务型企业针对客户企业机床装备能力维护与提升需求,形成包括机床维修与升级、废旧机床再制造、机床以旧换新、机床厂家特约集成维修等功能的机床综合再制造服务模式。本文所提模式已在某制造服务型企业初步实践,取得了很好的应用效果。我国机床拥有量世界第一,机床综合再制造服务产业不仅自身是一个巨大的产业,而且对现代制造业机床装备能力提升具有重大作用。  相似文献   

7.
针对云服务环境下支持多任务协同运行的机床装备资源易受紧急插单、系统故障、质量异常等不确定高频扰动影响,致使云制造服务难以高效、稳定运行的问题,提出一种面向多任务协同的机床装备资源动态调度方法。通过应用非线性工艺规划理论,建立了一个包括最小时间、成本、能耗、负载均衡度及最优服务质量和可靠性为约束目标的调度模型,并采用改进遗传变邻域算法对其求解。同时,基于生产随机扰动致使调度方案动态偏离的问题,提出一种基于事件驱动和周期性重调度的动态调度策略,以支持云制造服务的协同优化运行;最后通过仿真案例验证该模型及算法的可行性和适用性。  相似文献   

8.
云制造环境下机床装备资源特性分析与语义描述方法   总被引:1,自引:0,他引:1  
针对云制造环境下机床装备资源具有异质异构、动态演化、高度自治等特性及网络化集成、服务化封装和供需智能匹配等需求,提出并构建了一种基于语义服务建模本体的机床装备资源描述框架,并对支持该框架实现的机床装备资源元数据本体表示方法、机床装备资源服务化封装等关键技术进行了研究。通过应用案例对以上研究成果进行了实验验证。  相似文献   

9.
提出一种基于云制造服务模式的数控系统无线移动单元,该系统可使用智能移动设备远程访问与操作现场数控系统,并能够将机床运行状态信息及故障信息发送至云端远程监控平台服务器。远程监控平台可将历史数据存储起来,供异地故障诊断专家分析,同时专家还能够通过网络摄像头以及各种传感器实时观测到机床运行状态,并通过视频会议的方式对故障机床进行联合诊断。系统内每个的制造设备都将以"社交机器"的方式在云制造服务平台上注册基本信息、技术指标、历史加工案例等,其制造能力将作为一种"资源"在平台上共享,其他企业或个人通过查找与咨询来租赁与自己加工要求相匹配的制造能力,以实现制造资源与服务的开放式协作。  相似文献   

10.
针对网络化制造平台向企业提供应用服务的过程中存在应用服务间协作不足的问题,提出了一种基于服务驱动机制的网络化制造平台的运行流程。该流程以六阶段服务的集成运行为主要特征,为企业提供了一个从产品销售和客户化定制到协同设计以及供应链管理等整个工作过程的协作服务环境。设计了一种实现该运行流程的服务驱动机制,该机制由基于主调度器的消息驱动机制、二层服务组件封装、基于XML模板的服务信息交换协议组成,解决了运行流程中复杂服务集群的驱动问题。最后,通过网络化制造平台的企业实际应用对该运行流程进行了验证。  相似文献   

11.
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...  相似文献   

12.
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.  相似文献   

13.
Giannuzzi LA  Utlaut M 《Ultramicroscopy》2011,111(11):1564-1573
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.  相似文献   

14.
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...  相似文献   

15.
分布动态载荷识别的抗噪处理   总被引:2,自引:2,他引:0  
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.  相似文献   

16.
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。  相似文献   

17.
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...  相似文献   

18.
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....  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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