印制板钻铣加工数据接口的设计与研究

分析了PROTEL生成的孔、异形孔和边缘数据文件的特点。在Windows平台上，采用Visual C 6.0开发工具设计出从PROTEL生成多种数据文件中提取图形信息的软件接口，将PROTEL直接连接到数控加工平台中，实现了PROTEL与钻铣数控机床的集成，通过该接口为印制板机械加工提供更为简捷的加工方法。     

基于Pro/E的数控联机加工研究

在Pro/E数控加工中,生成的刀住文件经过后处理模块生成的数控代码程序与华中数控系统不匹配,而手工修改对人员要求高、效率低.开发基于Visual C＋＋自动编程软件,应用到Pro/E数控加工程序的自动润色修改上,可视化强、生产率高、废品率明显降低.Visual C＋＋软件与Pro/E数控结合,将使数控加工操作更加方便.     

基于Pro/E的直齿圆柱齿轮CAD/CAM一体化研究

基于Pro/E平台,以Pro/E提供的二次开发工具Pro/Toolkit为基础,在VC＋＋6.0环境下编译程序,对Pro/E进行二次开发.本文以直齿圆柱齿轮为例,介绍了对其进行参数化建模的过程和其数控代码自动生成的原理,并详细介绍了菜单添加和对话框生成的方法,为实现设计与制造的集成化和自动化做了有益的探索.     

STEP-NC的可扩展标记语言实现方法研究

STEP-NC是新发展的数控编程国际标准（ISO14649），依据该标准生成的数控程序通常采用ISO10303 Part21物理文件格式。但该格式的数控程序不但不易解释，而且不适合在网上传输。为此，提出了采用可扩展标记语言作为STEP-NC数控程序的文件格式。首先，分析了STEP-NC数据模型核心内容及ISO10303 Part21物理文件格式数控程序的缺点，研究了可扩展标记语言格式STEP-NC数控程序的生成，包括文档结构的选择、EXPRESS向可扩展标记语言的映射等，并将其作为机床控制器的输入。将机床控制器软件划分为3个模块，即可扩展标记语言形式数控程序的解释、微观工艺规划并自动生成刀具路径和控制机床运动的数控指令的生成。重点研究了可扩展标记语言数控程序的解释。     

基于VisualC＋＋的数控软件的设计

基于Window下的CNC是数控技术发展的必然趋势，提出了运用面向对象的思想来实现多任务处理的方法，并介绍了数控软件的体系结构和实现的相关技术。     

基于VC++的变频调速技术在数控绗缝机中的应用

在数控绗缝机床中，采用VC＋＋实现基于RS485协议数字通信变频调速，以DELTA公司VFD—A系列变频器为例，结合实际应用开发绗缝机床数控系统。在绗缝机床数控系统中实现了高速、高精度和高稳定性的调速技术。     

基于Visual C＋＋与OpenGL的数控车削加工仿真系统研究

介绍了在WindowsXP环境中,以数控车削加工作为研究对象,利用Visual C＋＋与OpenGL综合开发了一个可视化数控车削加工仿真系统。此系统界面友好,交互性较强,实现了数控加工轨迹的模拟仿真,并较好地完成了对数控程序的正确性检查。     

虚拟数控系统刀具半径补偿功能研究

介绍了数控系统中刀具半径补偿的一种算法，全面分析了直线与圆弧的各种转接情况，提出了完整的分类算法，给出了相应的计算公式。采用VC 程序语言开发了虚拟数控铣床的刀具半径补偿功能，该方法推导简单，效率高，适用于各种数控系统。     

基于Visual C++的数控钻床仿真程序开发

分析了基于Visual C 的数控钻床仿真程序的主要功能，给出了作为其关键技术的编辑器及绘图器的实现，完成了整个仿真程序的开发，并投入了实际使用，提高了生产效率。     

基于CATIA的工程图图框、标题栏和明细栏快速生成技术

在CATIA三维模型生成的工程图中，工程图图框、标题栏和明细栏均需要重复绘制、手工填写，效率低下。为了解决这一问题，提出了用CATIA／CAA二次开发工具和Visual C＋＋6．0实现各种规格的工程图框的自动生成的方法，实现了从Oracle数据库中读入相关信息、自动填入标题栏、明细栏，工作效率提高10倍以上，这对于将三维CATIA模型快速地生成符合《机械制图》国家标准的工程图样具有非常重要的意义。     

高速圆柱滚子轴承生热研究

通过对高速圆柱滚子轴承拟静力学和生热的分析,编制了高速圆柱滚子轴承生热分析程序,对圆柱滚子轴承内部各热源分别进行生热分析,得到滚子轴承各个单元间的局部生热和轴承总生热。以一个型号轴承为例,分析了转速、载荷等多种工况参数对轴承局部生热和总生热的影响,结果显示内圈转速、径向载荷以及润滑油的入口油温对轴承生热的影响较大。轴承的生热分析为轴承的三维温度场分析、润滑油参数的选择等奠定了良好的基础。     

有限元网格自动生成

有限元网格生成技术对有限元法的发展和工程应用效果关系重大。本文首先对当前诸多的有限元网格生成方法进行了归纳分析比较，探讨了有限元网格生成技术的发展趋势；介绍了我们开发的基于智能化和可视化技术的有限元网格自动生成系统。     

有限元网格剖分与网格质量判定指标

讨论了网格剖分中的一些常见问题,阐述了网格剖分中应遵循的要求,介绍了近十多年来网格剖分方法的研究进展,回顾了网格剖分的各种算法,并比较了各种算法的优缺点。基于工程计算需求,提出了网格质量要求及判定指标,探讨了网格质量优化问题。同时,介绍了当前广泛使用的网格剖分前处理商业软件及其应用状况,并结合工作实际,给出了复杂模型网格剖分的具体实例。最后展望了网格剖分的发展趋势。     

陀螺电机轴连轴承生热分析

基于摩擦学理论,对轴连轴承组件生热进行了研究.针对轴连轴承组件的具体工况及结构特点,分析了轴连轴承组件的发热机理,建立了轴承组件内各部分功率损失计算模型,在此基础上得出了轴承总的生热和轴承各单元间的局部生热.以某型陀螺电机轴连轴承为例分析了不同工作转速和工作载荷对轴承总生热和各单元局部生热的影响.结果表明,轴承转速、轴...     

基于单自由度强迫振动的直线波浪发电系统研究

针对海洋环境中波浪发电系统存在腐蚀严重、冲击大的问题,对全密封式直线波浪发电系统的物理模型、电能转换、磁力线和磁通分布等方面进行了研究,对系统内电磁阻尼的改变导致发电动子位移幅值变化进行了分析,提出了一种基于单自由度强迫振动的直线波浪发电系统,基于Ansoft对直线波浪发电系统的磁场进行了仿真分析,使用单自由度强迫振动模型对发电动子的运动进行了分析,利用波浪水池对发电系统进行了定性实验。研究结果表明,直线波浪发电系统的全密封方式能解决发电部分腐蚀严重的问题,发电动子位移幅值的可控性减少了系统的冲击,磁力线和磁通分布均匀,系统整体可以跟随波浪一起运动。     

Aspect ratio effects of an adiabatic rectangular obstacle on natural convection and entropy generation of a nanofluid in an enclosure

In the present study, aspect ratio (AR) effects of a centered adiabatic rectangular obstacle numerically investigated on natural convection and entropy generation in a differentially heated enclosure filled with either water or nanofluid (Cu-water). The governing equations are solved numerically with finite volume method using the SIMPLER algorithm. The study has been done for Rayleigh numbers between 10³ and 10⁶, the aspect ratio of 1/3, 1/2, 1, 2 and 3 and for base fluid as well as nanofluid. It is found that, using the nanofluid leads to increase the flow strength, average Nusselt number and entropy generation and decrease the Bejan number especially at high Rayleigh numbers. At low Rayleigh numbers entropy generation is very low. By increasing Rayleigh number, entropy generation and Bejan number increases. It is observed that the viscose entropy generation is more considerable than the thermal entropy generation and has dominant role in total entropy generation. The maximum entropy generation occurs at AR = 1/3 and 3 and the minimum entropy generation occurs at AR = 1 and 1/2. It is observed that the effect of AR on Nusselt number, entropy generation and Bejan number depends on Rayleigh number.     

Numerical analysis of entropy generation in concentric curved annular ducts

The entropy generation has been numerically investigated in concentric curved annular square ducts under constant wall temperature boundary condition. The problem has been assumed to be steady, hydrodynamically and thermally fully developed and incompressible laminar flow with constant physical properties. The solutions of discretized equations for continuity, momentum and energy have been obtained by using an elliptic Fortran Program based on the SIMPLE algorithm. Solutions have been achieved for i) Dean numbers ranging from 3.6 to 207.1, ii) Annulus dimension ratios of 5.5, 3.8, 2.9 and 2.36, and iii) Prandtl number of 0.7. In this regard, local entropy generation as well as overall entropy generation in the whole flow field has been analyzed in detail. Moreover, the effects of Dean number and annulus dimension ratio on entropy generation arising from the friction and heat transfer have been investigated. Accordingly, it is concluded that the effect of volumetric entropy generation that is a result of fluid frictional irreversibility can be neglected as compared with volumetric entropy generation due to heat transfer irreversibility. As Dean number increases, the distribution of volumetric entropy generation coming out from the heat transfer irreversibility is formed by the temperature field, which is depending on the curvature.     

Modelling of the In uence of Tool Runout on Surface Generation in Micro Milling

Micro milling is a flexible and economical method to fabricate micro components with three-dimensional geometry features over a wide range of engineering materials. But the surface roughness and micro topography always limit the performance of the machined micro components. This paper presents a surface generation simulation in micro end milling considering both axial and radial tool runout. Firstly, a surface generation model is established based on the geometry of micro milling cutter. Secondly, the influence of the runout in axial and radial directions on the surface generation are investigated and the surface roughness prediction is realized. It is found that the axial runout has a significant influence on the surface topography generation. Furthermore, the influence of axial runout on the surface micro topography was studied quantitatively, and a critical axial runout is given for variable feed per tooth to generate specific surface topography. Finally, the proposed model is validated by means of experiments and a good correlation is obtained. The proposed surface generation model o ers a basis for designing and optimizing surface parameters of functional machined surfaces.     

Entropy analysis for nanofluid flow over a stretching sheet in the presence of heat generation/absorption and partial slip

The boundary layer heat transfer and entropy generation of a nanofluid over an isothermal linear stretching sheet with heat generation/ absorption have been analyzed. In the nanofluid model, the development of nanoparticles concentration gradient due to slip mechanisms, the effects of Brownian motion and thermophoresis, is taken into account. The dependency of the local Nusselt number and entropy generation number on the non-dimensional parameters is numerically investigated. The results show that the increase of heat generation parameter, Brownian motion parameter, or thermophoresis parameter decreases the entropy generation number in the vicinity of the sheet.     

挤压旋转的橡胶辊滞后生热温度场分析

为了研究橡胶材料非线性黏弹性行为表现出的滞后生热的影响,以一对挤压对滚的钢辊-橡胶辊为研究对象,先采用解耦方法进行瞬态力学场分析,再通过损耗计算得出节点生热率,最后将滞后生热作为内热源进行热分析,得到其稳态温度场分布。结果表明,胶辊产生的滞后温升为6～13 ℃,周向两端的温度最高,径向中部的温度最高。仿真结果与试验结果的良好一致性证明了该方法的可行性,也证明了滞后生热是运动过程中的主要生热因素。