薄壁圆筒孔径测量误差分析

为给圆筒类零件的加工制造提供误差控制理论的支持,对当采用单激光传感器半接触式测量方式,测量圆筒工件内径时,而引入的影响测量误差因素进行了综合分析.针对在保证圆筒工件安装定位理想化条件下,将激光传感器在圆筒的任意位姿分解为偏心、倾斜和安装偏折几种误差影响因素.再运用数学几何方法将几种误差因素进行叠加,建立数学模型,并通过...     

三种粒径的纳米铜粒子在润滑油中的摩擦学性能

采用电爆炸法制备了三种粒径的纳米Cu粒子,并用原子力显微镜进行了表征,研究了三种粒径的纳米Cu粒子在润滑油中的摩擦学性能。结果表明:大粒径的纳米Cu粒子在润滑油中有很好的极压性能;小粒径的Cu粒子在润滑油中有很好的抗磨减摩性能。     

内螺纹挤压攻丝的底径计算及加工技术

探索一种较为精确地计算内螺纹冷挤攻丝所需底孔尺寸的方法,并在介绍冷挤攻丝加工技术的同时验证了计算的准确性.     

CCD传感器在光电精密测径系统中的应用

介绍了ＣＣＤ传感器在光电精密测径系统中的工作原理，系统结构及检测电路系统。     

磁性明胶复合微球的制备和性质

研究了明胶改性新途径，制备了内含四氧化三铁晶粒，外壳为明胶的纳米级明胶复合微球。     

在线实时检测玻璃管外径和壁厚尺寸的新技术

本文介绍一种激光扫描与CCD传感器的新技术，用于在线实时检测玻璃管外径与壁厚的尺寸，分析了测量精度，还详细地描述了获得信息的电子学方法。     

Estimation of a joint diameter distribution by an implicit scheme and interpolation technique

A new technique to estimate the diameter distribution of a joint set from the contained trace length distribution is suggested. This technique obtains the diameter distribution directly from the sample histogram of the contained trace lengths without using any information about the trace length distribution of an infinite window. Compared with the previous method of Song and Lee [Estimation of joint length distribution using window sampling. Int J Rock Mech Mining Sci 2001; 38: 519–28], it is more accurate for small-size joint samples. To obtain more accurate estimates, we adopt an interpolation technique of B-spline to smooth out the sampled contained trace length distribution. The effect of the B-spline as a function of three kinds of predefined diameter distributions is examined by Monte Carlo simulations.     

Hierarchical Ring Network design

A Hierarchical Ring Network is obtained from a ring network by appending at most one subsidiary ring to each node of the ring and, recursively, to each node of each subsidiary ring. The depth d is the number of levels of the recursive appending of subsidiary rings. There are different definitions according to which rings are appended to nodes created at the preceding level (called an HRN) or to any node (called here an HBN for Hierarchical Bubble Network). The case of an HRN was considered by Aiello et al. who give bounds (not tight) on the diameter of such an HRN as a function of the depth and the number of nodes. Here we determine the exact order of the diameter both for an HRN and an HBN. In fact we consider the optimization problem of maximizing the number of nodes of an HBN (or an HRN) of given depth d and diameter D. We reduce the problem to a system of equations with a complex objective function. Solving this system enables us to determine precisely the structure of an optimal HBN and to show that the maximum number of nodes is of order D ^d /d!.     

基于IMAQ的小孔径测量

利用IMAQ的逼近法寻找圆周边缘可以实现孔径检测，但是对于小孔径测量是无效的。采用圆弧定圆心法和微圆填充法，用于小孔径的尺寸测量；通过尺寸校正系数获得测量值。实验结果表明，利用数字图像处理技术对零件孔径进行检测，是一种有效的方法。     

激光扫描在线检测玻璃管外径及壁厚系统的研究

介绍一种激光在线检测玻璃管外径及壁厚的方法，根据折射原理建立平行光扫描玻璃管后的光强分布的数理模型，并用计算机模拟出探测器输出信号波形，最后分析了几种主要误差来源和改善措施。