虚拟制造在材料加工上的应用研究

虚拟制造(VM)是一门新兴的技术,它主要是用于模拟真实生产,比如产品模型、仿真以及人工智能.虚拟制造是近年来依靠信息基础和知识库发展起来的.伴随着虚拟制造的应用,许多生产活动便可以集成并实现在系统上.生产的费用和以市场为导向所带来的研发时间便可以大大缩减.虚拟制造相关的技术,以及相关材料加工上的特殊技术和当前的研究成果都是值得去肯定的.虚拟制造系统开发的重点应该放在社会和技术方面.一些相关材料加工的虚拟制造的应用实例也已出现.     

浅析虚拟制造中的虚拟切削加工

虚拟制造是近年出现的一种先进制造技术,虚拟切削加工在虚拟制造中占有重要地位.文章从虚拟制造的概念、特点、相关技术现状出发,介绍了虚拟切削加工的特点、存在的问题及加工系统的关键技术,以期推动虚拟切削加工研究与应用的进一步发展.     

模具虚拟制造系统及其关键技术应用研究

通过分析虚拟制造技术在模具行业中的应用现状，提出了基于知识和网络的模具虚拟制造系统框架，并对相关关键技术进行了探讨，简介了虚拟工艺、虚拟加工单元技术应用研究成果。     

虚拟制造技术在车间设计中的应用

虚拟制造技术是利用计算机技术对所要进行的生产和制造活动进行全面的建模和仿真;本文在系统介绍虚拟制造技术之后,着重介绍了它在车间设计中的应用,并举例加以说明,对于虚拟制造技术的成功应用,可以更有效地灵活组织生产,缩短产品研制周期,获得最佳的产品质量和效益。     

面向加工质量预测的虚拟加工检测单元的研制

虚拟制造是在制造科学理论,计算机技术和现代信息技术基础上发展起来的数字化制造技术,建立虚拟物理单元是虚拟制造的基础和关键。提出 虚拟加工检测单元的概念,定义了虚拟加工检测单元的体系结构,分析了影响加工质量的主要因素,建立了虚拟加工检测单元的误差融合模型,提出了虚拟加工检测单元的工件描述模型,开发了虚拟加工检测单元的原型系统。     

加工过程的可视化仿真

讨论了虚拟加工环境建模、工件建模、NC代码解析以及加工过程仿真算法等加工仿真中的关键技术，应用这些技术建立了一个通用虚拟加工原型系统（VMS），为虚拟制造的实现提供了有效的支持基础。     

虚拟制造中的车削过程仿真系统研究

车削加工是应用最广泛的加工方法之一,对车削加工过程进行仿真具有重要的理论研究与实际应用价值。为此,基于C++ Builder软件进行了虚拟制造中的车削过程仿真系统研究。该系统可对工件进行仿真加工,并将加工过程显示在屏幕上,以发现制造过程中可能出现的问题,在产品实际生产之前就采取预防措施,从而达到产品一次性制造成功。降低了成本,缩短了产品开发周期;还可以对想象中的制造活动进行仿真,而不消耗现实的资源和能量。     

先进制造技术在铁制工艺品设计制造系统中的应用

以制造系统综合自动化技术现代生产经营和管理技术为代表的先进制造技术在企业中的应用可以提高企业的竞争力。这里将协同设计和制造资源计划概念应用至铁制工艺品设计制造系统中，基于三维设计软件Pro／Engineer进行开发了这套系统，并讨论了设计中的一些关键问题，提出了一种材料加工中的用料计划的算法。     

二十一世纪的先进制造技术

介绍了并行工程技术、精密工程技术、虚拟制造技术、超高速加工技术、清洁化生产技术、快速原型技术、特种加工技术等几项先进制造技术的概念,特点和应用。     

虚拟绿色制造系统体系结构的研究

探讨虚拟制造技术在绿色制造中的应用,在虚拟制造中实施绿色制造,提出虚拟绿色制造系统体系结构．分析虚拟绿色制造的目标、绿色设计、虚拟制造、绿色产品评估系统、基于产品全生命周期的管理信息系统等相关技术。     

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.