定点绘制盘形凸轮轮廓曲线的程序开发

利用AutoCAD VBA向AutoCAD菜单栏添加新菜单项,创建图形用户界面,编制宏代码,并在AutoCAD中设计和定点绘制凸轮轮廓曲线,为在AutoCAD中设计和绘制复杂平面曲线提供了具体实例.     

基于AutoCAD系统的ARX集成开发

讨论利用面向对象的集成技术对AutoCAD软件进行ARX定项开发 ,主要是以AutoCAD软件开发中最新的ARX技术并结合AutoCAD软件自身的特征数据模型 ,对AutoCAD软件集成的设计原理、设计思路进行了叙述。     

在AutoCAD中参数化绘制化工设备标准件

以椭圆封头的参数化设计为例,介绍了AutoCAD中利用AutoLISP编程语言对AutoCAD进行二次开发,把绘制化工设备标准件常用的某些操作,以命令的形式添加到AutoCAD中,实现参数化绘图设计。     

AutoCAD中函数曲线的绘制方法

针对AutoCAD使用过程中没有函数曲线绘制命令的问题，给出了在AutoCAD中绘制函数曲线的两种方法，对于AutoCAD的使用及二次开发具有一定的参考价值。     

基于SCR文件实现AutoCAD中复杂曲线的绘制

介绍了利用SCR脚本命令文件在AutoCAD中精确绘制复杂曲线的方法,这种曲线绘制方法简捷,并且效率高,使得在AutoCAD中绘制多义线等复杂曲线的过程得到简化,弥补了在通用软件AutoCAD中绘制复杂曲线的不足。     

基于组件的AutoCAD图形格式转换及其网络传输

讨论了在组件中实现AutoCAD的连接、AutoCAD图形格式转换及其网络传输的实现方法。通过使用组件,可以在Web环境下运用AutoCAD进行设计。     

AutoCAD与Word之间的通信技术

介绍了AutoCAD与Word之间的通信机制。基于OLE自动化技术 ,编写了一个能够在AutoCAD图形中与Word应用程序进行交互通信的程序 ,有效地实现了AutoCAD图形中的文本及Word文档中文本的共享和重用     

AutoCAD定制探讨及应用实例

介绍了AutoCAD的定制,探究了AutoCAD程序文件、支持文件和图形文件的组织与结构,在此基础上探索在AutoCAD中创建自定义工具栏、工具选项板,并且制作幻灯片文件和幻灯片库文件的基本方法,并提供了AutoCAD的定制及二次开发的具体实例。     

巧用AutoCAD多线绘制工程图形

在AutoCAD系统中,AutoCAD的绘图功能极其强大,一张工程图可以通过各种途径(命令)来实现最终目标。笔者通过长期使用AutoCAD,总结了一种灵活应用多线(MLINE)命令,采用多线绘图的一些技巧,可以显著提高AutoCAD绘图效率。     

DWG文件中字符串信息自动提取的研究

在介绍AutoCAD面向对象的二次开发环境ObjectARX及AutoCAD图形数据库结构的基础上,详细论述了一种在AutoCAD后台数据库中自动提取DWG文件中字符串信息的简单方法,并通过实例展示了该方法的实际应用价值。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

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.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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....