SolidWorks尺寸公差标注功能的拓展

运用高级编程工具Visual Basic和数据库软件Access,借助Solidworks API函数实现了Solidworks的尺寸公差标注的功能拓展,使其更符合我国的工程制图国家标准。开发模块是以Solidworks插件的形式,动态链接到Solidworks软件中可实现尺寸公差的即时查询和标注。     

用VBA开发形位公差标注模块

探讨用VBA在AutoCAD2000上开发符合我国现行国标的形位公差标注模块的方法，成功地实现了形位公差标注中公差值自动查询、各公差项目的关联以及一体化标注等功能。     

AutoCAD环境下尺寸公差自动查询与标注软件的开发

运用VBA语言开发出一套AutoCAD环境下公差自动查询与标注软件,以良好的人机交互界面让用户方便地一次完成查找尺寸公差和标注尺寸公差两项工作,有效提高了绘图效率,在工程绘图中有较大的实用价值。     

尺寸公差自动查询及标注系统的设计

运用VBA语言开发出一套用于Auto CAD环境下公差自动查询与标注软件,它以良好的人机交互界面让用户方便地一次完成查找尺寸公差和标注尺寸公差两项工作,有效地提高了绘图效率,在工程绘图中具有较大的实用价值.     

基于AutoCAD的尺寸公差自动识别与转换方法

分析了尺寸公差的标注方法,以ObjectARX为开发手段,实现尺寸公差的自动查询,能自动将尺寸公差带代号转换为对应的公差数值.分析了尺寸公差在AutoCAD数据库中的表示形式,介绍了尺寸公差和螺纹公差的提取算法及所使用的数据库技术.     

AutoCAD环境下公差与配合自动标注二次开发

利用AutoCAD内嵌的AutoLISP语言设计开发了公差与配合标注应用程序。应用该程序 ,用户不必再通过查手册获得偏差数值 ,只需调用相应的命令并输入公差等级和基本偏差 ,即可标注出符合国标的各种尺寸公差或配合 ,并且可以方便地调整标注位置和修改参数 ,实现了尺寸公差的自动查询和公差及配合的快速自动标注     

用VBA开发公差自动查询标注

通过AutoCAD内置的VBA开发工具，结合ACCESS数据库，进行尺寸公差的自动查询及标注设计，弥补AutoCAD在尺寸公差查询、标注方面的不足，克服公差手工设计的缺点，提高设计的准确性及高效性。     

基于Access数据库尺寸公差标注的AutoCAD二次开发

AutoCAD的公差标注在机械设计应用中非常广泛,但其标注需查询设计手册,相当不便。介绍通过Visual LISP使用ADO接口,实现了AutoCAD与Access数据库的连接,完成自动查询尺寸公差并标注的方法。用户输入查询条件,系统自动读取数据库,从而快速准确的查询公差数据,并完成标注。采用参数化方法进行尺寸公差的标注,提高了绘图效率,具有较好的实用价值和推广意义。     

如何在AutoCAD R14上标注公差符号

工程图样上标注公差符号是必不可少的,在AutoCADR14上标注公差符合,是非常麻烦的。我们要在尺寸标注类型对话框中,先选中Annotation,再对Tolorance进行修改,设置出必要的标注公差的上差和下差,这时再用尺寸标注命令标注尺寸,将自动产生所需公差,非常烦琐。它还有一非常致命的缺点,如果对该尺寸进行修改,后面的公差符号也就随之丢失。本人经过一段时间的摸索,通过利用Autolisp函数,修改AutoCAD实体数据库,标注公差     

基于AutoCAD的形位公差代号标注系统的开发

尽管AutoCAD为用户提供了标注形位公差的命令,但用该项命令所注出的代号,在框格尺寸、特征符号和附加符号等方面,均与我国现行的形位公差标准存在较大的差距。用Auto LISP语言开发的形位公差代号标注系统,不但可以快速注出符合标准规定的各种代号,而且利用系统设置的基准代号标注功能和循环运行模式,可以一次性完成图中所有基准和公差代号的标注。     

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...     

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。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

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...     

Hybrid inversion method for equivalent electric charge of thunder cloud based on multi-station atmospheric electric field

This article proposes the hybrid method to inverse the equivalent electric charge of thunder cloud based on the data of multi-station atmospheric electric field. Firstly,the method combines the genetic algorithm( GA) and New ton method through the mosaic hybrid structure. In addition,the thunder cloud equivalent charge is inversed based on the forw ard modeling results by giving the parameters of the thunder cloud charge structure. Then an ideal model is built to examine the performance compared to the nonlinear least squares method. Finally,a typical thunderstorms process in Nanjing is analyzed by Genetic-New ton algorithm with the help of weather radar. The results show the proposed method has the strong global searching capability so that the problem of initial value selection can be solved effectively,as well as gets the better inversion results. Furthermore,the mosaic hybrid structure can absorb the advantages of tw o algorithms better,and the inversion position is consistent with the strongest radar echo.The inversion results find the upper negative charge is small and can be ignored,w hich means the triple-polarity charge structure is relatively scientific,w hich could give some references to the research like lightning forecasting,location tracking.     

虚拟式流体参量集成测试系统及其实现

为了实现对流体参量的自动测量,运用虚拟仪器设计思想,采用组件技术、海量数据存储技术及仪器通用化设计方法,设计并实现了虚拟式流体参量集成测试系统.该系统能同时对流体的温度、压力和流量等进行动态测试.实验室演示表明,该集成测试系统性能稳定,操作简单,功能较强大.     

COMPUTER SIMULATION OF CONTINUOUS ELECTROMAGNETIC STIRRING FOR MAKING RHEOLOGIC SEMI-SOLID SLURRY OF ZL112Y ALUMINUM ALLOY

To realize the technology of fabricating the rheologic semi-solid slurry of ZL112Y aluminum alloy via continues electromagnetic stirring process, ANSYS software was used to simulate electromagnetic force field and fluid velocity field in the alloy melt in a crucible tube in three coils. In the first section of the paper, eletromagnetic force field and fluid velocity field caused by single coil were simulated. The result of this simulation gives an average velocity of 3.2 cm/s and it is called critical velocity because a fluid velocity over it will cause a fine and spherical structure of solid primary a in a semi-solid melt. And, from this result, a reasonable temperature of semi-solid of the alloy and an electrical current intensity were established. The electrical current intensity of the result of this simulation corresponded to the current intensity used in a practice experiment, in which the primary α was obviously refined and sphericized. Based on this simulation of single coil electromagnetic stirring, in the second section of the paper, eletromagnetic force field and fluid velocity field caused by three coils were simulated. The result of the simulation shows that, 1） there is a semi-solid zone of 32 mm from bottom of the crucible tube to the upper; 2） the electrical current intensities of three coils of 400 A, 600 A, and 400 A, which were set to top range, middle range and bottom range of the tube, respectively, were the optimum parameters of electromagnetic current intensity under the condition of this investigation; and 3） under effect of these electromagnetic current intensity, the fluid velocities of the melt in the tube were 6.3 cm/s in top range, 3.75 cm/s in middle range, and 3.9 cm/s in bottom range of it, respectively.     

运用EMD和GA SVM的齿轮故障特征提取与选择

针对齿轮故障特征提取,首先将齿轮箱振动信号进行经验模态分解,得到一组固有模态函数.计算各固有模态函数的能量和矩阵的奇异值,采用Shannon熵和Renyi熵度量能量和奇异值分布,构成原始特征子集.再采用遗传算法和最小二乘支持向量机的Wrapper方法选择最优特征子集.该方法能够利用较少的特征参数集准确判别齿轮故障,提高了齿轮故障诊断的精度与效率.     

基于有限脉冲响应模型的飞机磁场补偿方法

通过分析飞机磁场数学模型,将飞机磁场表示成方向余弦与其乘积项的函数.鉴于模型参数之间存在很强的复共线性,提出了基于有限脉冲响应模型飞机磁场补偿方法.该方法将光泵磁强计和三轴磁强计的输出作为有限脉冲响应模型的输入,由带通滤波器提取信号中的变化成分,再用最小方差估计有限脉冲响应模型参数,并利用有限脉冲响应模型参数计算飞机磁场.从测量总磁场中减去飞机磁场,可得到目标信号磁场数据.最后,通过计算机仿真验证了该磁场补偿方法的有效性.