CAI在机床课程教学中的应用

计算机辅助教学（ＣＡＩ）应用于机床课程教学，可大大提高机床教学的学习效果及效率，使机床原理，机床结构更易被接受。本文介绍了一些ＣＡＩ应用于机床教学的一些心得体会，以期在相关的学校甚至工厂推广ＣＡＩ机床课程教学。     

机械设计课程的CAI

简述了ＣＡＩ的含义和意义以及机械设计课程ＣＡＩ软件的类型、内容和发展趋势，讨论了ＣＡＩ教学的问题。     

机械设计课程的CAI

简述了ＣＡＩ的含义和意义以及机械设计课程ＣＡＩ软件的类型、内容和发展趋势，讨论了ＣＡＩ教学的问题。     

《机械设计》CAI课件设计的构思

计算机辅助教学（ＣＡＩ）应用于《机械设计》课程教学，可减轻教师劳动强度，提高学生学习效率，有利于推广优秀的教学经验，使学生更积极、灵活地学习，也使教学水平提高了一个档次。本文介绍了《机械设计》ＣＡＩ课件设计在模拟教学试验、辅助课程设计、辅助课堂教学和自我测试四个方面的构思及能够带来的教学效果。     

Auto—CAD环境下机械制图计算机辅助教学的研究

本文研究了Ａｕｔｏ－ＣＡＤ环境下的机械制图计算机辅助教学，对其ＣＡＩ课件进行了系统设计，所设计的ＣＡＩ课件可使学生在计算机上独立完成“机械制图”课程和Ａｕｔｏ－ＣＡＤ绘图的学习。     

世界一些国家机床工业情况统计资料

世界一些国家机床工业情况统计资料表１世界一些国家机床工业人数、厂激、产值情况资料来源：１．１９９２～１９９３ＩＥｃｏｎｏｍｉｃＨａｎｄｂｏｏｋｏｆｔｈｅＭａｃｈｉｎｅＴｏｏｌＩｎｄｕｓｔｒｙ》ＡＭＴ．２．（ＣＥＣＩＭＯ》１９９３３．１９９２年机床工具...     

机械设计课程CAI研究的几个问题

本文阐述了机械设计课程ＣＡＩ发展的现状，分析了机械设计ＣＡＩ的特点，探讨了如何尽快发展机械设计ＣＡＩ的问题。     

机械设计课程CAI研究的几个问题

本文阐述机械设计课程ＣＡＩ发展的现状，分析了机械设计ＣＡＩ特点，探讨了如何尽快发展机械设计ＣＡＩ的问题。     

北京阿奇（AGIE）工业电子有限公司──瑞士在中国的第一家高技术合资企业

北京阿奇（ＡＧＩＥ）工业电子有限公司──瑞士在中国的第一家高技术合资企业本公司是北京实创数控精密机械公司和瑞士ＡＧＩＥ公司合资的高新技术企业，主要生产高精度数控电加工机床。现有产品为ＣＣ１００精密ＣＮＣ低速走丝线切割机，ＳＣ４００、ＳＡ４００精密数控...     

《机械设计》CAI课件设计的构思

计算机辅助教学应用于《机械设计》课程教学，可减轻教师劳动强度，提高学生学习效率，有利于推广优秀的教学经验，使学生更积极、灵活地学习，也使教学水平提高了一个档次。本文介绍了《机械设计》ＣＡＩ课件设计在模拟教学试验、辅助课程设计，辅助课堂教学和自我测试四个方面的构思及能够带来的教学效果。     

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.