基于Auto CAD的三维实体快速生成零件的二维图样

利用Auto CAD的图纸空间创建了具有一套标准图纸的布局样板文件,并将零件的三维实体在标准图纸上自动生成二维视图,通过开发工具VBA程序对图形对象的图层特性自动设置,再对视图进行必要的编辑,最终得到零件的二维工程图.该方法可以实现由三维实体到二维图样的快速转换,满足零件设计和图纸输出的要求.     

在AutoCAD中应用ObjectARX自动获取标注尺寸

介绍了 Auto CAD图形数据库及实体的构成 ,阐述了利用 Object ARX实现实体对象获取的一般方法 .在此基础上 ,详细叙述了采用 Objec-t ARX建立应用软件的原理 ,实现 Auto CAD环境下标注尺寸的自动获取及其尺寸链的解算     

液压集成块的计算机辅助设计

用传统的手工方法设计液压集成块,既复杂,又易出错,严重影响设计周期。如果采用计算机辅助设计,建立实体模型和图纸空间,LISP语言视口技术,给设计人员提供一个新的3维设计环境,就可以简捷、明瞭地完成设计任务。为此,本文介绍用Auto CAD11版本软件设计液压集成块的方法。一、计算机设计集成块的设计思想 1.进入Auto CAD后,点取SOLIDS顶部菜单项,在其下拉式菜单中点取loadAME即可装入实体建模程序。     

基于AutoCAD的产品信息提取及报表系统设计

设计实现了自动提取Auto CAD图纸中标题栏和明细表块属性以及标题栏和明细表中的文本信息，将数据按用户要求传出到数据库，并对得到的数据进行分类报表，输出到Auto CAD中。     

基于AutoCAD VBA的滚筒参数化绘图系统开发

在带式输送机特大型滚筒结构的优化设计中,需要实现优化设计结果的自动化绘图。为解决这一问题,本文采用面向对象的VBA语言实现参数化绘图的原理,基于Auto CAD开发了简便易用的参数化生成滚筒的总图和零件图的程序,说明了参数化绘图在计算机绘制滚筒结构图纸的实现方法,以及编程中关键问题的解决方法。该方法加快了滚筒的设计速度,提高了滚筒的图纸质量。     

可在微机上实现油路块CAD的软件

Auto CAD 是一种专门用于绘图的系统软件。它的绘图功能强大、简单易学、使用方便。俗话说图纸是工业的语言,然而,在工程制图上我国始终处于手工绘制的落后状态。为了早日改变这种状况,实现设计、制图自动化,对Auto CAD 应用的研究有着     

高效率参数化渐开线花键拉刀设计方法

介绍了一种高效率参数化渐开线花键拉刀设计方法,该方法主要由渐开线花键拉刀CAD及其数据库组成。应用该软件,设计人员只需输入渐开线花键拉刀设计的初始数据,计算机即可自动实现高效率的渐开线花键拉刀的Auto CAD图纸设计。     

采用VB与AutoCAD结合绘制批量图纸

作为一种通用图形处理软件,Auto CAD在二维图纸设计方面功能完善,易学易用,将广大技术人员从传统的图板中解放出来,是目前应用最为广泛的二维制图软件。本文根据CAD在机械设计中的实际情况,以VB与Auto CAD软件相结合处理批量图纸的例子进行探讨。     

在Auto CAD 2000中添加新绘图工具

介绍在Auto CAD 2000中绘图时,用Visual LISP程序编写一些简单绘图工具程序,并将其程序放置在Auto CAD2000的用户界面中,可十分方便地随时调用这些绘图工具,方便操作和绘图。     

AutoCAD中从3D模型绘制2D图形的技术

阐述了在使用 Auto CAD进行机械图样绘制时直接作三视图的不便之处。介绍了一种在 Auto CAD中通过实体建模直接生成机械图样的新方法及其命令和技巧。     

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.     

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....     

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。     

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.