变结构体参数设计的一种新方法

变结构体参数化设计一直是参数化设计中的难题,在研究现有变结构体参数化设计中的主要方法一变结构变参数设计和模块化变参数设计的基础上,提出了一种基于样条化变参数设计的新设计方法,分析比较了这三种设计方法的优缺点.研究表明,基于样条化变参数设计方法具有数据储存量小、只需生成某一类型的参数设计样板即可实现一类零件的变结构体变参数设计的优点,用VC++6.0开发环境编制了实现程序,验证了样条化变参数设计方法的可行性.     

基于SolidWorks阀门参数化CAD系统的研究

参数化设计是现代设计的主要特征,本文分析和研究了基于SolidWorks的阀门参数化设计方法,较为详细的讨论了采用SolidWorks API与VB编程实现参数化设计的方法,以及采用SolidWorks系列零件设计表实现参数化设计的方法.从工程设计实际出发,提出了实现阀门参数化设计及阀门库的建立方法,并以实例说明了参数化设计及阀门库在零件建模和装配中的应用.     

基于Pro／E的参数化设计

参数化设计是一种能够提高设计速度的设计方法。本文论述了参数化设计的概念,原理及特征,研究Pro／E软件的参数设计方法。最后以标准直齿轮为例,着重阐述了参数化设计的方法和步骤。     

基于UG的参数化设计方法及程序设计技术

论述了冷冲压模具中三维模型参数化设计方法,基于UG三维软件阐述三种参数化设计方法及程序设计技术,并提供了设计实例。最后提出了三种参数化设计方法综合应用的设计思想。     

参数化设计的研究现状与发展趋势

阐述了基于ＣＡＤ模型的参数化设计方法，介绍了参数化设计的基本原理和方法，并阐述了由参数化 设计发展起来的特征参数化设计和知识驱动。     

基于UG的产品级三维参数化设计研究

参数化设计技术已成为产品设计过程中一种最重要的设计方法.按照所对应的对象,参数化设计分为零件级参数化设计和产品级参数化设计,零件级参数化设计技术已在生产实践中得到成功的应用,但还不便于实现产品级参数化设计,而目前的设计过程却要求实现整个产品的三维参数化.为此,基于UG软件研究了产品级三维参数化设计技术,提出了利用UG/...     

Creo二次开发参数化设计技术的应用研究

首先分析了参数化设计对企业产品设计的作用,其次对零件的参数化设计及组件的参数化设计的模型建立方法进行了研究,最后通过二次开发技术实现了零件及组件的参数化设计,为企业的产品快速开发提供了一种新的思路和方法。     

基于Pro/E的电解机械复合抛光机三维参数化建模研究

通过对Pro／E的三维参数化建模方法及技术的研究，提出了参数化建模方案及参数化建模方法，实现了电解机械复合抛光机的参数化设计，提高了设计效率和设计质量。     

基于Pro/E二次开发的电动汽车底盘车架的参数化设计

介绍了Pro/E的参数化设计原理和Pro/Toolkit二次开发工具实现参数化设计的基本方法,并以电动游览车底盘车架的参数化设计实现为例,分析了基于Pro/E二次开发工具Pro/Toolkit实现参数化设计的关键步骤和技术,详细阐述了参数化设计的实现过程。     

固定式单尾车的系统参数化设计方法研究

提出一种基于数字化设计方法,应用二次开发语言C#.NET、APDL及编程建立了系统参数化设计方法,包含三维模型设计及其非几何信息参数化方法,基于表视图的APDL参数化分析方法及基于有限元方法参数化模型基础上的结构优化设计方法。并将此方法应用于某型斗轮堆取料机固定式单尾车参数化设计与分析中。算例表明,此先进的数字化设计方法大大提高了非标产品设计效率,增加了模型的重用性并减少了设计差错,解决了数字化开发中的关键问题。     

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.     

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....     

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.