彩色CRT偏转误差及测量方法的研究

彩色CRT的偏转误差主要包括会聚误差和光栅误差,测量会聚误差和光栅误差是验证偏转线圈偏转特性的重要手段.会聚误差取决于R/G/B三束在屏上相互之间的距离量,而G束形状则决定了屏上光栅的误差量.基于彩色CRT光点测试系统所配置的一种高精度且又灵活的多功能测试系统,其测量对象是经过偏转线圈自身会聚及光栅误差校正的"裸管"."双光点测量法"的应用可完全消除会聚误差测量中的驱动抖动误差,而运用"单线测量法"可使光栅误差测量过程最简化.因此,测试系统能最大限度地重复运用测量设备,并以最简化的系统配置实施精确的测量.     

A Calibration of Instruments with Non-Random Errors

The problem of calibration of instrrrments where measurement errors can be described as the sum of random walk and an independent observational error, is considered. Calibration policies, which are relevant to this error structure, are discussed, and comparisons between alternative methods are made.     

三坐标测量机直线度误差的测量

误差补偿是提高三坐标测量机整体精度的经济而有效的手段,本文利用精度等级更高的激光干涉仪对三坐标测量机的X轴直线度误差进行了测量,并得出了初步结论,为以后进行误差补偿提供了依据。     

IVECO车身视觉检测系统现场溯源研究

汽车车身视觉检测系统是大型、专用的车身总成三维尺寸自动化检测设备,系统组成复杂,测量误差难以确定。本以南京ＩＶＥＣＯ车身视觉检测系统为背景,提出了一种现场溯源技术,解决了测量结果不确定度的溯源问题。     

脉动气流对孔板流量计示值影响的实验研究

本从脉动流对孔板流量计影响的基本原理出发,以实际过程为研究对象,通过在不同脉动工况条件下的大量实验,研究了复杂脉动流动对孔板流量计测量的影响,提出了复杂脉动流条件下,应用孔板流量计应遵循的原则。     

机床主轴回转误差补偿信号的测量理论和方法

本文提出了一种机床主轴回转误差补偿信号的实时测量方法。该方法采用两组差动电容传感器，直接相对主轴表面进行测量，传感器的极板设计成弧形以消除被测截面的形状误差分量。文中分析了测量方法的原理，介绍了简单、实用的测试系统。     

A Study on Estimating Measurement Error in the Measurement of Earing of Pilfer-Proof Caps

The present study was carried out in a reputed Indian integrated aluminum industry. Closure stock, a premiere product of this company, is used as pilfer-proof caps. One important output characteristic was earing percentage, which was basically an undulated edge that emerged during deep drawing due to nonuniformity of metal flow. Earing was defined as the difference between hills and valleys on the cup ring after deep drawing of a circular blank. Plant management was interested in implementing statistical process control (SPC) to control earing. There was a discrepancy in the test results of earing percentage of the product tested in their laboratory and in their customer's laboratory. They were also apprehensive about the presence of considerable error in the measurement system, which might creep into the study and spoil the SPC effort. Before implementation of the SPC, management decided to ascertain the measurement system and have an estimate of measurement error. Therefore, the present study was initiated. Three lots and all three operators were taken into the purview of study. Two cups (closed sample) were drawn from each lot by each of the operators, with 30 cups being drawn. Each cup was measured twice by each operator. Thus, a set of 180 observations was obtained. The data were analyzed using five-stage nested analysis of variance (ANOVA). Error due to repeatability and reproducibility were estimated from ANOVA. Estimate of error of the measurement system was obtained by combining these two components. This error was compared with the international standard. It was recommended to consider this error while reporting the test results to the customer. As a result of implementation, the discrepancy problem of test results of earing percentage was substantially reduced.     

同轴度误差的解析评定法与仿真研究

在介绍符合定义的同轴度误差解析评定法的基础上，着重对该方法进行了仿真研究，分析了安装误差、测量系统中的直行运支误差及其对仪器回转轴线的闰行度误差等对同轴度误差测量结果的影响。文中建立的同轴度误差解析评定数学模型和得出的结论为同轴度误差测量信和在线测量系统的研究提供了理论基础。     

质量比较仪测量结果的不确定度评定

本文依据GJB3756-99（测量不确定度的表示及评定》和JJF1059-1999《测量不确定度评定与表示》，以CC500型质量比较仪为例，对质量比较仪测量结果不确定度进行了定性分析和定量分析。     

涡轮流量计在正弦脉动气体流下的测量误差

对正弦脉动气体流中涡轮流量计的测量误差进行了理论和实验研究。利用涡轮流量计在气体流中的数学模型,求出了在正弦脉动流作用下的涡轮流量计测量误差与脉动参数之间的理论关系式,并针对脉动流计算了涡轮流量计测量误差。设计了相应的实验装置,实验结果与理论计算值较为吻合。     

测试设备的测量可靠性及容差分析

本文采用测量可靠性和工程容差来表征测试设备的能力和准确度，给出了它们与不确定度表征方法之间的数学关系，分析了校准风险，为评价测试设备的技术性能提供了新的途径。     

大型机械形位误差检测中的基准及其选择,建立原则

在讨论形位误差检测其准建立的一般原则基础上，具体分析讨论：大尺寸机件位置误差检测中基准误差的来源；延伸公差带的传递特点；基准选择建立时容易疏忽而造成不良后果的几个问题。     

BEPCⅡ束流引入的真空测量误差

当BEPCⅡ储存环的束流突然丢失时,真空计和离子泵的压力测量值都先有一个瞬时的减小,之后才逐渐降低到本底压力。这表明束流运行时压力测量值中存在着束流引入的正误差,误差量正是测量值减去实际值之差。丢束之后束流引入的误差立即消失,真空计测量值反映的是实际压力。对于某个真空计,利用突然丢束后压力测量值随时间变化的数据进行非线性拟合,得到一条负指数衰减的抽空曲线,根据它外推可以得到丢束时刻的实际压力。对于若干次突然丢束,用这种方法观察丢束流强不同时该真空计误差量的变化,发现误差量与流强基本呈正比例关系。通过直线拟合求得比例系数,也就得到了在任意流强下根据该真空计压力测量值来计算实际压力的公式。