基于SolidEdge API的齿轮参数化建模及开发

以三维CAD软件SolidEdge为开发平台，讨论了齿轮的参数化建模方法并且利用ActiveX Automation技术将齿轮的设计计算和三维实体造型结合在一起，利用特征操作方法生成了渐开线齿轮的三维模型。这里的开发方法给出了一个利用Vc＋＋对CAD软件进行二次开发的一个有效途径。     

设计三维化带来的工艺模式变革浅析

正随着三维软件的普及应用,设计人员逐渐习惯于采用三维建模的方式进行绘图工作,其效率比二维软件、手工制图提高很多倍,效率不言而喻,这要求下游的工艺设计也要与时俱进,充分利用上游设计人员产生的三维模型及其携带的MBD信息。这是实现工艺设计变革的根本手段。传统工艺设计手段尽管可以采用一些辅助软件进行良好的信息表达,但对于CAD成果的利用有限,尤其是三维CAD的有效利用,其落后极大地制约了     

基于加工仿真的立铣刀三维参数化设计

基于CATIA软件平台进行二次开发,开发出基于加工仿真的高速立铣刀三维参数化设计的CAD软件系统。设计人员输入立铣刀的使用参数和主要结构参数,根据系统的数据库和相关程序自动生成立铣刀的三维CAD模型以及加工立铣刀的砂轮刀位轨迹及NC代码,调用VERICUT软件进行立铣刀磨削加工仿真,从而保证立铣刀参数化设计的三维模型的可加工性,保证刀具设计的质量和缩短刀具设计和制造周期。     

基于SolidEdge的电器元件库开发技术的研究

以三维CAD软件SolidEdge为设计平台,利用VB开发工具和Access数据库系统,对常用的三维电器元件库的二次开发进行了方法和技术上的研究。并结合企业的个性化产品,开发出了系列参数化元件和非参数化元件的零件库。将其应用于实际产品的设计过程,不仅提高了产品设计的效率,而且为三维CAD技术在企业中的应用提供了新思路。     

齿轮实体参数化造型系统的开发

介绍了应用 Visual Basic(VB)程序语言 ,基于三维机械 CAD软件 Solid Works97平台 ,开发齿轮三维实体参数化造型设计系统的方法。解决了工业生产中齿轮三维实体造型设计的难题 ,并且提供了一种对三维 CAD软件开发的方法 ,使设计者掌握运用该方法进行实际开发 ,提高开发 CAD软件的能力     

基于逆向CAD技术实现并联机构自动化装配研究

提出了装配过程逆向CAD方法,结合Visual Basic 6.0高级语言,基于SolidWorks软件API对象及其函数,开发了并联平台自动装配系统。以线条的方式建立了各种运动副零部件的三维实体模型,并在不使用数据库技术及其相关软件的情况下,利用CAD软件自带的系列零件设计表功能,建立了一个广义上的动态数据库,在运动副杆件结构尺寸方面实现了更进一步的参数化。实践证明,对三维机械设计软件的装配建模进行二次开发,装配过程逆向CAD方法是一种行之有效的解决途径,利用该方法可以研发大型、系列化装配体建模的参数化设计系统。     

基于UG建模模块的注塑模具设计

UG软件是一套集成化的CAD/CAM/CAE软件,利用UG软件可以进行直观的三维模具设计.文中综合了模具设计人员利用UG设计注塑模具的方法和流程,从总体上研究了基于建模模块的注塑模具的设计技术.     

产品逆向设计中特征和约束的重建

利用目前逆向工程软件重建的实物CAD数字化模型,只能实现对产品几何形状的复制,因此设计者不能对CAD模型进行更进一步的编辑修改及再设计。提出了通过将逆向设计软件与三维参数化CAD系统相结合的方法,由实物的点云模型反求出CAD模型,此方法反求出的不仅仅是实物的几何形状,而且可用参数化的方法重建出各特征、特征间的几何约束和设计者的设计意图,从而使反求出的模型支持对复制产品的再设计。     

SolidWorks环境下利用VB开发圆锥齿轮精锻件

介绍了以SdidWorks为开发平台,以VB为编程语言,开发圆锥齿轮精锻件三维实体参数化造型系统的方法,旨在提供一种对CAD软件二次开发的新方法,使设计者能够运用该方法对复杂的三维实体进行参数化设计．从而提高开发应用CAD软件的能力。     

结合SolidEdge与PowerPonit进行产品虚拟模型的动态演示

作为一名机械设计人员,展示其设计概念时,往往要借助于形象、直观的三维模型来代替样机模型。目前,三维CAD设计软件为实现这一目的已提供了可能。随着计算机技术的飞速发展,应用三维CAD设计软件进行设计已成为必然趋势。Solid-Edge是众多三维CAD设计软件之一,已广泛应用于机械设计行业中。将SolidEdge与Power Point结     

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.     

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....     

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.