矩形花键量规的检测技巧

探讨三坐标测量机检测矩形花键量规的程编技巧,通过教学测量、软件编程,生成自动测量程序。在对称度误差的评定中,巧妙考虑了角度定位精度、键槽型面与键槽轴线平行度的影响因素。通过此方法检测满足技术要求的矩形花键量规,必然同时满足装配要求,避免各种误判产生。     

三坐标测量孔系位置度方法的实践

简述了三坐标测量位置度误差的原理及方法;三坐标测量位置度误差应注意的问题;通过具体的检测实例分析了如何利用基准坐标系的平移、旋转来对位置度的测量数据进行优化处理,以减小三坐标测量软件对位置度的评定误差,对零件质量进行正确判断,为企业产生经济效益。     

浅谈测量不确定度及在评判测量系统能力中的应用

文章详细阐述了测量不确定度的定义、测量不确定度的计算方法及步骤、测量不确定与测量能力的关系,以"三坐标测量光孔和螺纹孔位置度"为例,具体讲述了测量不确定度和测量能力的计算方法及如何利用测量不确定度评价测量系统适用性的方法.     

浅谈测量不确定度及在评判测量系统能中的应用

文章详细阐述了测量不确定度的定义、测量不确定度的计算方法及步骤、测量不确定与测量能力的关系，以“三坐标测量光孔和螺纹孔位置度”为例，具体讲述了测量不确定度和测量能力的计算方法及如何利用测量不确定度评价测量系统适用性的方法。     

位置度的三坐标测量方法的实践

简述了三坐标测量位置度误差的原理及方法;三坐标测量位置度误差应注意的问题;特殊标注位置度误差的测量应用;通过具体的检测实例分析了如何利用基准坐标系的平移、旋转来对位置度的测量数据进行优化处理以减小位置度的测量误差,对零件质量进行正确判断,提高产品的合格率,为企业产生效益。     

圆周均布孔位置度误差的通用测量程序

针对目前三坐标测量机应用软件缺少孔位置度误差通用测量程序的问题,本文介绍了孔位置度误差的计算方法,提出了在三坐标测量机上如何通过编程计算孔的径向误差、周向相对误差和周向绝对误差。采用根据图纸要求对给定轴向基准孔和未给定轴向基准孔的两种情况,分别利用周向相对误差和周向绝对误差进行位置度误差的计算方法。为编制圆周均布孔位置度误差的通用测量程序提供参考。     

矩形和渐开线花键综合量规的检测

文章介绍尺寸为Φ25－Φ60矩形花键，渐开线花键量规的形位公差要求，单项误差的检测方法，如分度误差、对称度、齿向、渐开线、跨棒距等，具体叙述了所使用的仪器，操作步骤，注意事项和计算方法，按此方法测量能保证其准确性。     

基于GPS的三坐标测量机不确定度评定

三坐标测量机是一个广泛应用的几何量测量仪器,准确评价其测量结果的不确定度,对于提升测量结果的可用性具有重要意义。本文基于产品几何规范（GPS）,分析了三坐标测量机的误差来源,给出了相应的不确定度评价指标,同时结合孔径测量的实际案例,详细阐述了进行不确定度评定的过程和方法。     

在万工显上测量矩形花键塞规的对称度

矩形花键塞规的对称度一般都是在光学分度头上测量,这样比较麻烦。我们在万能工具显微镜上用影像法测量,方法简便易行,不但测量范围广(单及多个键都能测量),而且精度可靠。具体步骤如下:     

CMM平面度测量不确定度评定

准确评定三坐标测量机测量不确定度,对于产品检验可靠性提升具有重要意义。本文研究了三坐标测量机平面度测量不确定度评定,结合测量实例,详细阐述了不确定度评定的过程和方法。     

Non-linear bending analysis of plates and shells by using a mixed spline boundary element and finite element method

In this paper, a mixed spline boundary element and finite element method is suggested to analyse non-linear bending of plates and shells. Only the fundamental solutions for plates are required in order to establish the boundary integral equations. A quadratic rectangular spline element is adopted to deal with the membrane effects of plates and shells. Numerical examples show that the approach developed in this paper is very effective and especially promising for the non-linear analysis of plates and shells.     

几何非线性样条有限元法

根据样条有限元方法的基本原理,拓展建立了一种几何非线性样条有限元方法.该方法充分利用了样条函数乘积的性质,将样条函数的积分显式地表达出来,使得传统有限元中需要花费大量时间的刚度矩阵计算可以很简单的得到,具有精度高、输入量小、连续性强等优点.它与普通有限元法使用高斯积分计算的精确结果均在高斯积分点上不同,样条有限元所得到...     

板壳概率变分原理

本文建立了薄板、薄扁壳及考虑剪切变形板壳的概率变分原理及概率广义变分原理,它们是建立概率有限元法、概率有限条法及各种概率样条函数方法的理论基础。     

样条有限点法分析板的大挠度问题

样条有限点法已成功地应用于板的线性分析。本文用样条有限点法求解几何非线性平板,以位移u、u和W作为基本未知量,采用三次B样条插值函数与梁函数级数的乘积作为位移试函数,从最小势能原理出发建立基本方程,推导了非线性切线刚度矩阵,用改进的Newton-Raphson方法求解非线性方程组,最后给出了算例,其结果与一些已有的成果进行了比较,表明该方法分析板壳结构的非线性问题是十分有效的。     

关节坐标测量机研制中圆光栅误差修正技术

介绍了关节坐标测量机原理、组成,并对其进行了误差分析.从理论上分析了圆光栅安装偏心误差对测量结果的影响,介绍了圆光栅分度误差测量方法,并采用非线性拟合的方法对该项误差进行了修正.     

On the comparison of bilinear, cubic spline, and fuzzy interpolation techniques for robotic position measurements

This paper describes a novel technique for position error compensations of robots based on a fuzzy error interpolation method. A traditional robot calibration implements either model or modelless methods. The compensation of position error in a model-less method is to move the robot's end-effector to a target position in the robot workspace, and to find the target position error online based on the measured neighboring four-point errors around the target position. For this purpose, a stereo camera or other measurement device can be used to measure offline the position errors of the robot's end-effector at predefined grid points. By using the proposed fuzzy error interpolation technique, the accuracy of the position error compensation can be greatly improved, which is confirmed by the simulation results given in this paper. A comparison study among various interpolation methods, such as bilinear, cubic spline, and the fuzzy error interpolation technique is also made via simulation. The simulation results show that more accurate compensation results can be achieved using the fuzzy error interpolation technique compared with its bilinear and cubic spline counterparts.     

Study of the automatic planning of measurement points with basic element features

The purpose of this paper is to study the selection by a coordinate measuring machine (CMM) of the position of measurement points during the measurement of workpieces constituted by geometric elements. The heuristic algorithm of measurement point distribution was then used to determine the appropriate position of measurement points. By using the CAD/CAM software and the powerful calculation and analytic capability of a computer, the appropriate position and number can be quickly obtained.     

Curvilinear Bicubic Spline Fit Interpolation Scheme

When the digital computer is used to design an optical system, the solution is obtained at a set of grid points over a given plane. A reliable interpolation technique is then required to find the values between the grid points, and the bicubic spline fit interpolation technique is often used for this purpose. When the system geometry is circular, a polar grid pattern is usually preferable to a rectangular or triangular grid pattern, especially when the behaviour of the computed function is strongly dependent on the boundary conditions along the circumference of the circular system. The currently available bicubic spline fit interpolation scheme for the rectangular coordinate system is not suitable for use with a polar grid pattern and must therefore be modified. In developing the modified interpolation scheme, a feature of physical significance has been added and is based on the fact that all physical laws are formulated with length as the basic unit. Because the functions to be interpolated are usually the physical quantities, the interpolation scheme presented in this paper uses the radial length (r ¥) and the arc length (r ¥ r ¥ /) as the bases of the interpolation and implicitly takes account of the shape of the patch, which is a wedge or truncated wedge. This approach of using the arc length represents a distinct departure from that which essentially substitutes r, / variables in the polar coordinate system for x y variables in the rectangular coordinate system.     

广义康托洛维奇法解任意四边形板的弯曲问题

本文从变分原理和双线性坐标变换出发,采用基于三次B样条函数的广义康托洛维奇法得到了带有各种边界条件任意四边形板弯曲的近似解答。样条函数广义康托洛维奇法是一种数值型的康托洛维奇法,因而它既能化二维问题为一维同题,同时又具有样条函数法收敛快、精度高、处理边界条件方便等优点。推导出的计算格式适用于各种边界条件,使梯形板、平行四边形板和矩形板的弯曲问题为本文的特殊情况。本文方法与通常有限元法相比,具有计算量小、精度高等显著特点,且通用性强,是一种很有前途的计算方法。     

基于卷积型原理的时空样条元

结构动力分析是工程设计中的重要组成部分,传统动力分析不能全面反映动力初值特征,而Gurtin变分原理则被认为是目前唯一能全面反映动力初值特征的变分原理.本文以Gurtin变分原理为基础,空间和时间上同时采用样条元,建立了计算梁的动力初值问题的样条元法。算例表明, 与现有的分析方法相比,本文具有更高的精度。