共查询到20条相似文献,搜索用时 46 毫秒
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多视觉检测系统的定标 总被引:2,自引:0,他引:2
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。 相似文献
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激光检测技术在现代轿车车身制造中的应用 总被引:4,自引:0,他引:4
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。 相似文献
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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。 相似文献
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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. 相似文献
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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。 相似文献
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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. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
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. 相似文献
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