参数化设计在GIS开关设备中的应用研究

介绍了参数化设计的定义、方法、原理和优点,重点阐述了如何利用Inventor中的iPart和iAssembly机制进行零部件的参数化设计,通过对GIS开关设备进行参数化技术分析,把该参数化设计过程应用于某开关厂,提高了产品设计的效率以及系列化产品的一致性。     

参数化设计在GIS开关设备中的应用研究

介绍了参数化设计的定义、方法、原理和优点,重点阐述了如何利用Inventor中的iPart和iAssembly机制进行零部件的参数化设计,通过对GIS开关设备进行参数化技术分析,把该参数化设计过程应用于某开关厂,提高了产品设计的效率以及系列化产品的一致性。     

参数化设计在产品造型设计中的应用研究

本文主要探究参数化设计在产品造型设计中的应用场景和应用方法,通过对目前参数化设计概念特征、参数化建模技术、产品造型设计流程的综述,总结了基于Grasshopper的产品造型设计建模流程,并借助Grasshopper参数化平台对实际产品案例进行模型构建实践,验证了该设计流程的有效性。同时也拓展了参数化产品造型设计理论,为设计师进行相关设计实践提供了理论指引。     

面向大规模定制的CAPP技术研究

提出了一种满足大规模定制条件下敏捷生产准备需要的参数化CAPP技术,并认为它是一种有效的工艺设计方法.参数化CAPP的实现包括产品族、组件族和零件族的形成、典型工艺的制定、典型工艺的参数化、工艺参数化驱动规则的确定、参数化工艺库的建立和参数化工艺设计系统的开发等,其中典型工艺的参数化是实现参数化工艺设计的前提和基础.并对典型工艺的参数化、参数化对象模型建立以及基于CAPPFramework的参数化工艺设计进行了重点讨论.     

风力发电机组塔筒参数化设计

为满足日益增长的定制化市场需求,有效解决风电主机厂质量、成本、交货期魔鬼三角,湘电风能有限公司在塔筒系列化设计中引入参数化设计理念。简要阐述了参数化设计原理和塔筒参数化设计方法,在此基础上对风力发电机组塔筒进行了参数化设计。     

铁路车辆变刚度圆柱螺旋弹簧组参数化设计

以模块化设计思想和圆柱螺旋弹簧参数化设计理论为指导,采用可视化的、面向对象的编程软件VB为开发工具,通过Solid Works提供的API接口进行二次开发,建立了铁路车辆变刚度圆柱螺旋弹簧组参数化设计系统。依据弹簧设计需求,在对弹簧组进行载荷分配并确定各弹簧参数后,完成了弹簧计算机程序化设计,实现了弹簧的结构尺寸设计、强度校核、疲劳寿命估算、疲劳试验方案设计、挠力图生成、参数化三维造型与工程图自动生成等功能。弹簧组设计系统为后续的弹簧参数化设计提供了重要参数,提高了设计质量和自动化程度。     

基于SolidWorks的齿轮三维参数设计系统的研究

采用基于特征的参数化设计方法,使用SolidWorks对齿轮零件的三维参数化进行设计。首先研究基于特征的参数化设计的方法和步骤,然后阐述了如何使用VB进行SolidWorks的二次开发,最后给出了齿轮的三维参数化设计流程和步骤,在设计中使用宏操作进行API函数的调用,来简化程序设计的难点。该齿轮三维参数化设计系统大大加快了齿轮设计速度,实践证明是准确高效快捷的。     

基于Web服务的齿轮参数化设计重用研究

渐开线圆柱齿轮是机械传动中重要的零件,由于齿形轮廓复杂,设计参数多,造成其三维建模比较困难。同时,为了实现在网络环境下对齿轮进行设计,提出基于web服务的齿轮参数化设计重用方法,构建了基于web服务的齿轮参数化设计重用框架。通过C#对UG二次开发,创建齿轮参数化对话框,编写参数化驱动程序。构建齿轮的特征参数数据库,以便快速提取常用齿轮参数。开发基于web的齿轮参数化设计和重用平台,实现在网络环境下对齿轮进行参数化设计、修改和下载,大大提高了齿轮设计的效率。     

基于Visual Lisp的直齿锥齿轮参数化设计及优化系统开发

研究了AutoCAD平台下基于Visual Lisp语言的直齿锥齿轮参数化设计与绘图程序,实现了直齿锥齿轮的设计、校核及参数化绘图,并对设计参数进行了优化.为同类产品实现参数化设计与绘图提供了一种减少重复性劳动和提高设计效率的有效方法.     

基于CATIA的三维参数化建模方法及其应用

参数化设计是现代CAD软件的核心技术.利用参数化设计手段可使设计人员从大量繁琐的设计、计算、绘图工作中解脱出来,提高了设计效率,可以在实际制造物理样机之前通过虚拟来方便地修改设计,缩短产品开发周期,降低成本,增强市场竞争力.对基于CATIA的三维参数化建模方法及其技术进行了研究,详细地阐述了三维参数化建模的基本方法和一般步骤.并介绍了在CATIA V5中进行铰链四秆机构参数化、可视化和虚拟装配设计的方法,并对该四杆机构进行了干涉分析和运动仿真分析.详细介绍了针对设计要求通过实时修改构件参数实现铰链四杆机构“一模多型”的虚拟装配设计方法.以可视化的形式实现设计意图,提高了设计速度和质量.     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.