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最近二十几年 ,坐标测量技术发展迅速 ,各种型号的测量机与测量软件不断推出 ,其功能和应用范围不断扩大 ,用户也越来越普遍。但由于一些用户使用不当 ,致使测量机在测量某些项目与尺寸方面准确度偏低 ,从而对坐标测量机抱怀疑态度。根据我长期使用坐标测量机的经验 ,下面谈谈坐标测量机使用中的一些误区 ,及在实践中怎样提高坐标测量机测量准确度。误区一、任何情况下测量工件可在测量机床平台上任意放置。由于坐标测量机是在工件上采点自动找平找正建立工件坐标系测量工件各要素 ,因此认为在任何情况下工件可在平台上任意放置而不影响测量… 相似文献
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坐标测量机广泛应用于复杂尺寸和形位的测量,其坐标测量机的示值误差直接影响测量的结果。坐标测量机的示值校准是提高测量链的准确度的主要方式,用大尺寸量块对坐标测量机的示值进行校准是目前的通行做法,本文对坐标测量机的示值校准结果的测量不确定度进行探讨。 相似文献
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本文介绍的是利用三坐标测量机来测量曲线的一种方法。一、引言测量机在测量过程中,工作轴线是相互垂直的。反映出的读数值为测球中心在机器坐标系中移动的实际距离。但是就三坐标测量机在测量一些连续变化 相似文献
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对柔性坐标测量机的测量空间进行了定义,建立了测量模型,采用蒙特卡罗(Monte Carlo)理论生成了6个关节变量的伪随机数,并利用坐标测量机的测量模型进行了仿真.仿真结果表明,该测量空间的形状为一完整的球体,没有"空腔",证明了柔性坐标测量机几何结构尺寸的设计符合要求,并有助于进一步研究该测量机空间误差分布规律. 相似文献
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《中国新技术新产品》2016,(24)
本文对CORE-DS型白光测量机进行对比验证试验,掌握针对某叶片的测量基准建立、测量程序编制和参数评价方法。通过与接触式三坐标测量机进行测量对比试验,验证其测量的准确性和可行性。 相似文献
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三坐标测量机对工件尺寸进行测量时,由于其特有的测量方法和数据处理方法,易造成测量数据不准确。通过三坐标测量机测量原理及计算机数据处理算法分析,适当改变尺寸测量的方法,可有效提高三坐标测量机测量数据的可靠性。本文以三坐标测量环规直径尺寸为例,分析了对直径尺寸影响的各种影响因素,以便三坐标操作及使用者在测量过程中选取合适的测量仪器来满足我们的测量要求。从而为我们的测量仪器的选择提供了一个可供参考的依据。 相似文献
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论述了模具测量的特点,分析了三坐标测量机在模具测量方面的优势,归纳出提高模具测量精度的方法,提出产品质量控制的目标与手段。 相似文献
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Samuel H. Huang John P. Dismukes J. Shi QI Su Mousalam A. Razzak Rohit Bodhale 《国际生产研究杂志》2013,51(3):513-527
Traditional productivity metrics, such as throughput and utilization rate, are not very helpful for identifying the underlying problems and opportunities for productivity improvement in a manufacturing system. In this paper, a systematic methodology is presented for productivity measurement and analysis at the factory level. Metrics of Overall Equipment Effectiveness (OEE) and Overall Throughput Effectiveness (OTE) are introduced and developed, respectively, for rigorous and quantitative measurement of equipment and system productivity. These metrics are integrated with computer simulation to facilitate rapid analysis of equipment and manufacturing system productivity, and the investigation of productivity improvement opportunities. The results of this research make possible the representation of factory level productivity or overall factory effectiveness by OTE, and the use of OTE for quantitative benchmarking and comparison of the productivity of various factories. A real-world manufacturing case study is reported to demonstrate how to employ these techniques to improve manufacturing productivity. 相似文献
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为打破传统计量保障仅关注测量设备准确性而非测量结果可靠性的局限,构建了适用于民用航空
发动机全链路的测量过程控制管理体系。该体系以提升测量数据质量为目的,覆盖从部件设计到整机试验,从
适航取证到客户交付所涉及的全部产品测量过程。在测量过程设计阶段,根据测量需求及过程的关重程度,分
析测量能力,导出测量质量要求。在测量过程控制阶段,根据不确定度分析结果,锁定不确定度来源,利用测
量系统分析、控制图、测量能力审核等手段监控测量过程。在测量有效性验证阶段,结合科研阶段航空发动机
测量过程特点,建立同族测量过程归集,通过测量不确定度评定实现质量验证。该体系初期应用于厂内装配执
行过程“高压压气机转子装配”项目的测量分级、能力分析、过程监控、结果验证等,对实现包括试验验证、
生产制造等过程的全部相关方测量过程管理具有借鉴意义。 相似文献
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工厂厂房为了实现进气、排气及集尘的目的,需布设通风系统。由于其分布范围广泛,使得通风系统的噪声成为工厂厂房室内噪声中除机电设备之外的另一主要噪声源,对厂房内员工的作业声环境造成很大的冲击。通风系统的噪声源主要来自风管的固定支架振动、风管进排气噪声、管道壁振动以及管道噪声通过管壁的透射。文章建立了一套针对工厂通风系统噪声的声源与声场测量、频谱分析、诊断排序与降噪模拟评估技术,利用声场模拟,给出三种降噪方案。应用此技术对工厂噪声进行治理,可大大提高业主选择降噪方案的信心及成效预期心理。 相似文献
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A. M. Onishchenko 《Measurement Techniques》1993,36(10):1107-1111
An optimal (minimum-error) instruments calibration technique based on the method of least squares and on correction with comparable argument and function errors is described. Expressions are derived for calculating linear regression coefficients and calibration errors. The process of calibration when the instrument signals are nonlinear functions of the measured parameter and when the measurement error is different at different points of the measurement range is discussed. Calibration of an instrument operating in an automatic control system for maximum factory benefit is cited as an example.Translated from Izmeritel'naya Tekhnika, No. 10, pp. 26–28, October, 1993. 相似文献
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大直径数显测量装置系统的研究 总被引:1,自引:0,他引:1
大型零件直径尺寸的测量是当今国内外尚未得到很好解决的技术关键。本文主要介绍作者设计研制的大直径数显测量装置系统,并提出了新的测量原理和方法,经鉴定验证,该装置的测量精度可以满足大直径零件IT6精度等级的加工要求,保证了产品质量. 相似文献
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Fiorentin P. Iacomussi P. Rossi G. 《IEEE transactions on instrumentation and measurement》2005,54(1):171-177
This paper describes the methodology developed for characterizing a commercial charge-coupled device (CCD) camera as a luminance meter for analyzing lighting systems and especially for measurements in road light plants. Today, several luminance meters based on commercial CCD cameras are on the market. They are very attractive for the lighting engineer: The availability of a high number of closely spaced small detectors (pixels) on a single chip permits analyses almost impossible with a traditional luminance meter. These commercial-industrial CCD cameras are sold at prices lower than scientific grade ones. They are factory equipped with a dedicated filter to reach the correct photopic sensitivity V(/spl lambda/), and they are factory calibrated in luminance SI units. The main counterparts in using these cameras are in the difficulties to define the measurement accuracy and the influence of the environment luminance on the measured values of the framed scene, in the low resolution of their A/D converter (usually 8 or 12 bit), and the higher noise level (usually the CCD chip is not cooled). To reach the measurement accuracy required by lighting norms, it is necessary to characterize metrologically a camera and quantify all the possible external influences which could degrade its performances, in real measurement situations, and which could affect the measurement results. A carefully controlled measurement set up and operating procedure could limit the causes of errors and improve the accuracy of measurements obtained in operating conditions. In this way, the measurement uncertainties might be evaluated completely, and considerations on the results could suggest particular operating practices to limit the causes of error due to measurement setup and environmental conditions. 相似文献
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为满足电动自行车的发展需要,研发了一种用于电动自行车1:1性能检测的计算机辅助系统,在介绍该系统体系结构及其功能的基础上,通过对1:1性能检测理论、高性能测控系统、高柔性化的机器脚模块和强电磁干扰背景下目标信号提取及数据处理等关键技术的研究,参照日本雅马哈公司的《带辅助驱动电机的电动车型式检验规程》,成功开发了这种电动自行车1:1性能计算机辅助检测系统,并已投放市场进行了应用,长时间的运行表明,提出的方案是可行和有效的,所开发的系统具有高效、高精和高鲁棒性的特点,适合型式和出厂检验的应用需求. 相似文献
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This article describes experience in developing an interactive factory scheduling system using computer graphics. The implementation contains three parts, each of which is graphically displayed and manipulated: a network-based model for describing the basic operation of the factory, a Gantt chart for scheduling the factory, and plots of inventory levels over time for evaluating the schedule. The system was implemented at Cornell's instructional computer graphics facility and used for teaching for a period of three years. 相似文献