CAXA软件在砚台创新设计中的应用

阐述了用CAXA制造工程师（以下简称CAXA—ME）2013和CAXA线切割XP软件制作砚台的过程。CAXA软件具有集成数据接口、几何造型、加工轨迹生成、加工过程仿真检验和数控加工代码生成等一整套面向复杂零件和模具的数控编程功能。首先,利用该功能,对设计有深刻寓意的足形砚台进行加工,但是,CAXA—ME不能接受扫描出的图形文件,因而使用CAXA线切割XP的位图矢量化功能,将该文件进行矢量化处理,处理好格式转换后,再导入到CAXA—ME中;然后,利用CAXA—ME的浮雕功能,进行弥勒佛图像雕刻,增加了该设计的艺术性;最后,分别将修改好的NC程序导入数控铣床进行实体加工。     

文字、图案数控凹凸雕刻加工计算机辅助编程系统

介绍作者研制的文字、图案数控凹凸雕刻加工计算机辅助编程软件系统的关键技术方法。该软件系统能够将以图形扫描方式和图形 Ｃ Ａ Ｄ方式得到的文字、图案的图象和图形文件,经过一系列的处理和转换,按照凹或凸的雕刻加工要求,自动生成数控铣床的加工程序。     

基于VB的数控雕刻图像预处理软件的研究与开发

论述了利用Windows位图（BMP）数据直接进行数控雕刻加工的关键问题,提出了一种解决BMP图像数据字节重组处理问题的算法。根据该算法,应用Visual Basic（简称VB）程序设计语言编程,开发了一用于点阵法数控雕刻的图像预处理软件,以满足数控雕刻加工的需求。     

基于MasterCAM的平面图形雕刻加工技术

结合CorelDRAW软件,介绍了位图与矢量图之间的格式转换,并利用MasterCAM软件对图片CAD模型进行了数控加工设置,合理确定其加工工艺参数,动态仿真整个加工过程,最后通过后处理自动生成NC代码,实现了平面图形的雕刻加工。     

汽车安全玻璃副像偏移电子检测系统

主要介绍了利用CCD摄像头和计算机软件对汽车安全玻璃的副像偏移值进行实时采集和处理的方法。首先用CCD和图像采集卡将副像偏移的光学图像转换为计算机能识别的数据模式,然后利用图像处理程序求出副像偏移的值。该方法具有测量精度较高,测量结果实时显示以及在普通室内的光照条件下也可以测量等优点。     

数控抛光机床后置处理方法及图形化编程软件

后置处理是为了将刀轨文件转换为机床各轴运动参数。图形化编程是一种针对复杂零件的重要的数控编程方法。以六轴五联动数控抛光机床为例,参照工业机器人运动学,通过建立一系列坐标系并进行运动学求解,进而推导出该机床的后置处理方法。图形化编程软件是在UG基础上二次开发得到,并将后置处理方法写入软件中。在VERICUT中搭建虚拟机床进行仿真加工,仿真结果证实了该后置处理方法的正确性、图形化编程软件生成NC代码的有效性。     

采用CATIA V5的曲面文字数控雕刻

探讨了采用CATIA V5软件在FANUC四轴数控加工中心上进行曲面刻字的方法,包括曲面文字的CAD建模及CAM雕刻,并将软件生成的刀具轨迹G代码传输至FANUC数控加工中心,实现了曲面文字的雕刻。该方法提高了曲面文字雕刻的精度,同时扩展了数控加工中心的产品加工范围,实现了数控加工中心的"一机多用"。     

零件图像的Hilbert扫描-小波分解去噪处理

提出了利用图像的Hilbert扫描曲线和小波变换实现图像去噪的方法。将含噪声图像生成为Hilbert扫描矩阵,再将Hilbert扫描矩阵转换为一维向量,对一维向量进行小波分解,提取低频分量并转换为二维矩阵。然后,对二维矩阵进行Hilbert反扫描,完成图像去噪处理。仿真实验结果表明该方法是有效的。     

位图矢量化在激光雕刻技术中的应用

激光雕刻中矢量雕刻效果通常好于位图雕刻,而实际中大量图像以位图文件形式存储,因此矢量化就显得尤为重要。阐述了激光雕刻过程中位图转换为矢量图的技术和方法,并利用实例展示了矢量化处理过程及雕刻结果。     

零件图像的Hilbert扫描-小波分解去噪处理

提出了利用图像的Hilbert扫描曲线和小波变换实现图像去噪的方法.将含噪声图像生成为Hilbert扫描矩阵,再将Hilbert扫描矩阵转换为一维向量,对一维向量进行小波分解,提取低频分量并转换为二维矩阵.然后,对二维矩阵进行Hilbert反扫描,完成图像去噪处理.仿真实验结果表明该方法是有效的.     

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...     

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。     

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...     

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。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.