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。     

多视觉检测系统的定标

针对结构光视觉传感器所组成的多视觉测量系统，本文提出一种直接线性转换全局定标法，把各传感器的模块坐标归结到一个统一的用户坐标中。该系统用于轿车白车身有关参数的快速检测。标定后的系统对轿车进行检测，经与三坐标测量机测量结果比较，３σ＝０．５ｍｍ，完全满足车身公差±２ｍｍ的要求。     

线激光扫略的白车身装配特征机器人在线检测技术研究

为实现白车身装配特征位置参数的在线检测,监控和保障白车身焊接尺寸质量,研制了一种基于线激光摆动扫略的白车身装配特征机器人在线检测系统.提出了摆动式线激光单目视觉传感器的测量系统方案和传感器参数标定方法及传感器摆动运动标定方法;分析了传感器摆动采集光刀图像的特点,进而提出了面向孔槽、柱状类装配特征的光刀点云提取算法及位置参数计算方法;进行了系统集成,开发了在线检测系统,并展开工程应用验证.验证结果表明:本技术实现了对白车身各类装配特征快速、精密、稳定的检测.     

汽车车身模型立体视觉测量系统

针对汽车车身开发的要求,采用计算机立体视觉技术,建立一套适用于车身模型表面三维数字化的非接触式测量系统。     

激光检测技术在现代轿车车身制造中的应用

激光检测技术用于工业生产已有数十年历史，但将计算机、信息处理、三维图象处理和激光测量融为一体的三维激光检测系统用于实际生产则是２０世纪９０年代后取得的重大进展，并在现代轿车制造，特别是车身生产过程的应用实践中发挥了很大的作用。     

CIMS环境下汽车车身CAD系统的研究与应用

结合东风汽车公司车身计算机集成制造系统中车身ＣＡＤ系统的研究和应用，介绍了高新技术引起的车身设计方法的重大变革以及计算机在车身设计实际应用中的关键技术和应用成果。     

车身三坐标检测数据图形分析软件开发

根据三坐标测量机检测汽车车身后输出的数据特点,提出了一种计算机图形分析方法,并介绍了软件的编制.实施后,大大减少了车身精度分析时间,提高了分析准确性,并有效地提高了白车身质量.     

一种车辆长度尺寸的视觉测量算法

近年来,随着我国汽车保有量的不断增加,汽车的车身尺寸检测成为了汽车运行安全检测的重要内容。传统的人工测量方式精度差、效率低。结合汽车表面的图像信息,通过图像边缘检测、区域标记滤波、图像的配准与融合和边缘定位,提出了一种车辆长度尺寸的视觉测量算法。经过车辆长度的测量实验,结果表明该算法测量的相对误差达到1%,耗时低于3 s,实现了车辆长度尺寸测量的准确性和快速性,为车辆综合性能检测和智能交通系统提供了一种有效的补充。     

汽车车身静态刚度测量

汽车车身静态刚度测量对于汽车整体性能检测来说已成为一个非常重要的部分,本文详细介绍了一套汽车车身静态刚度试验的系统(包括硬件、软件及相互通信等等)。并以红旗轿车为例,对其白车身进行弯曲变形和扭转变形试验,检测汽车车身的刚度状况。     

现代检测技术在上海大众汽车厂车身生产中的应用

上海大众二期工程是一个体现了九十年代初国外先进水平的轿车整车制造厂，所采用的先进工艺技术中，用于车身生产的检测技术不但具有鲜明的特色，而且充分反映了企业把生产现场作为质量控制主战场的思想。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Assessment of intakes of mixtures of radionuclides

Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。