Metrological characterization of an hexapod-shaped Multicomponent Force Transducer

A Multicomponent Force Transducer (MFT) was devised by INRiM for a specific request in railway industry, entailing measurement of two force components (transversal and axial force). Measurement of other components, while not strictly required, was deemed helpful for practical use. INRiM, basing on its experience, developed and calibrated a full six-component hexapod-design prototype of MFT. Best Subset Regression was applied to identify parsimonious models linking applied components to MFT outputs. Finally, the uncertainty associated to the values of transversal and axial force was evaluated.     

Weather measurements traceability: An example at INRiM

A weather measurements station is installed at the Italian Institute of Metrology (INRiM) and used to measure and save temperature, pressure and air humidity values. The aim of the Institute is to provide weather measurements that are traceable to the national standards. A dedicated software for interfacing the station, for acquiring the measurements and collecting them into a data base was realized at the INRiM. Moreover, the sensors of the station were calibrated within a climatic chamber by comparison with the INRiM standard instruments. For the first time in Italy, a project for ensuring traceability to weather measurements is being conducted. The aim is also to promote the evaluation of the associated uncertainties, which are not provided by any Italian Meteorological Service, at present. Further developments of the activity will consist in making available through the Internet the instant measured values of the weather parameters, as well as a complete data base of the recordings, stored in daily, monthly and annually collected data archives.     

美国ASE认证体系及其启示

ASE是美国汽车服务行业的一套职业技能认证体系,文章介绍了ASE的组织由来、职业划分、考试方式、行业影响。以自动变速器及其驱动桥维修认证、汽车制动系统维修认证为例,系统分析了ASE的测试范围、试题比例、考核要求、参考教材。基于对ASE的研究,提出了开发科学的职业标准、建立严谨的认证体系,对我国汽车维修行业和汽车职业教育行业具有重大意义。     

Peculiarities of the certification of reference specimens for liquid-penetrant testing

The characteristics of reference specimens are described, as well as the specific features of their application for checking the serviceability of flaw-detecting materials and evaluating the sensitivity of liquid-penetrant testing. Features of the certification of reference specimens used for this purpose are presented.Translated from Defektoskopiya, Vol. 40, No. 9, 2004, pp. 74–84.Original Russian Text Copyright © 2004 by Glazkov.     

扩大粘度基准量程的研究

对扩大粘度基准量程作了研究 ,包括高粘度标准物质 (聚异丁烯 )性能及定值方法 ,特别是高粘度物质在毛细管法中残留量影响的研究。通过研究使粘度基准量程提高了一个数量级 ,从 1× 10 5mm2 /s提高到 1×10 6mm2 /s。该量程基准的测量不确定度为 0 7%～ 1% ,达到国际先进水平     

同位素稀释质谱法测定聚丙烯塑料中Hg的含量

采用同位素稀释电感耦合等离子体质谱法（ID-ICP-MS）测定了聚丙烯塑料中Hg元素的含量。样品处理采用高压密封焖罐酸溶样技术,将样品与²⁰²Hg稀释剂混合,通过所加稀释剂的量和测量混合样品中²⁰⁰Hg/²⁰²Hg的丰度比,准确计算出样品中Hg元素的含量,同时对测量结果的不确定度进行分析和评定。该方法与传统方法相比具有准确度高、不确定度小、受外界污染及样品损失影响小等优点,适用于国家计量单位对标准物质进行定值。     

民用运输类固定翼飞机适航取证管理数字化建设研究

介绍了国内外民用运输类固定翼飞机适航取证管理数字化建设的现状,分析了适航取证条例、适航取证要求、适航数据特征,以及适航对研制平台的要求,同时从建设目标、关键能力、应用成果三方面论述了适航取证管理数字化平台核心能力.适航取证管理数字化立足于适航规章,能够科学有效地对适航数据和任务进行全生命周期管理,可以为民用运输类固定翼...     

氦同位素锂辉石标准物质的研制

Two spodumene samples for helium isotope standard were prepared. According to the preparation criterion on first grade national standard materials, homogeneity tests of helium contents and isotope compositions of two samples were carried out using the heat melt method. The homogeneity tests and certification analysis show that 4He contents and 3He/4He ratios of two reference material samples are homogeneous. Afterward two standard samples were distributed to four laboratories for cooperative fixed values. All data of various laboratories submit to normal distribution and not abnormity values. The average values of each laboratory are recommended as values of two spodumene samples for helium isotope standard.     

同位素稀释质谱法测定国际比对样品Sn-Ag-Cu系焊锡中的铅

将²⁰⁷Pb同位素稀释剂与样品混合,加入H₂O₂和HF对混合样品进行消解,采用同位素稀释质谱法对两种不同铅含量国际比对焊锡样品中的铅进行了测定。使用常规硝酸和盐酸消解Sn-Ag-Cu系焊锡时易生成氯化银和β-锡酸不溶物的H₂O₂-HF体系避免了此类问题,并加快了样品消解速度。研究了样品基体对²⁰⁸Pb/²⁰⁷Pb比值测定及最终结果的影响,在保证精密度的情况下,通过逐级稀释的方式可降低测定过程中大量锡基体的干扰。建立了Sn-Ag-Cu系焊锡中高、低含量铅的准确测定方法,并对测定结果的不确定度进行了评定。CCQM-P119和CCQM-K88“无铅焊锡”中铅的国际比对结果表明,同位素稀释质谱法与传统方法相比,准确度高、不确定度小,测定结果获得了很好的等效度,从而进一步验证了方法的准确性和可靠性。该方法同样适用于焊锡基体标准物质的定值。     

不同标准溶液对ICP-OES法测定钡定值样品的影响

采用不同的标准溶液、不同的稀释介质配制钡标准系列和钡定值样品,用电感耦合等离子发射光谱法（ICP—OES）测定定值样品中钡的浓度。结果表明由于配制的标准系列和定值样品存在体系间的差异,定值样品中钡的测定结果存在偏差用1％HNOs稀释测定的结果相对标准偏差为3．6％;用水稀释测定的结果相对标准偏差为13．3％。保持标准曲线和分析溶液基体匹配,可有效地消除“酸效应”和“盐效应”带来的测定误差。     

Φ1.2m F/1.5抛物面主镜补偿器

用于Φ1200 F/1.5主镜面形检验的补偿器,需要补偿0.087mm的非球面度,并实现0.033λ（RMS）面形检测要求。详细介绍了该补偿器的设计、误差分析、加工、标校及最终主镜检测的情况;用于主镜检测前用计算全息（CGH）对补偿器标校显示：补偿器产生的抛物面面形误差为0.012λ（RMS）,二次曲面常数K的误差0.0064%;主镜最终的补偿检测结果为：面形0.027λ（RMS）,二次曲面常数K的误差0.0306%,与分析的结果相符合。结果表明：补偿器设计合理,建立的误差分析原则和方法可行,加工质量可靠,这将为更大口径高陡度非球面主镜的补偿检验奠定坚实基础。     

CCAP为汽车及零部件产业发展保驾护航——专访中汽认证中心主任 强毅

<正>随着我国经济的快速发展,汽车产业作为支柱产业的地位已初步形成。在此背景下,开展汽车及零部件产品认证工作具有重要意义。在认证活动的推广和发展中,质量认证已是汽车行业健康发展的重要基础和关键。随着市场经济全球化的发展,以及WTO有关规则在国内汽车行业的逐步落实和关税降低,汽车的进出口国际贸易得到蓬勃而迅速发展。质量认证不仅     

亚 50 nm 台阶高度标准物质的可控制备及定值研究

纳米台阶高度标准物质可以传递准确、可溯源的纳米高度量值。 针对我国缺乏可控的高质量亚 50 nm 台阶高度标准物 质制备技术的问题,提出了基于原子层沉积结合湿法刻蚀的纳米台阶高度标准物质研制方法,通过工艺过程优化实现了台阶高 度亚纳米量级精确可控,制备出了最小公称高度仅为 5 nm 的亚 50 nm 台阶高度标准物质系列。 其定值结果可溯源到米定义波 长基准,扩展不确定度不超过 2. 0 nm,均匀性和稳定性较好,不同测试仪器一致性水平较高。 研究结果表明,所研制的纳米台 阶高度标准物质可以用于亚 50 nm 高度量值传递以及多种测量仪器之间量值的比对测量,其产业化批量生产的前景也将为半 导体产业提供完善的计量保障。     

Composite-friendly approach to certification of advanced materials and fabrication methods used in aviation industry

An analysis of the applicability of metal-based certification methods to composite structures, as applied to materials and processes qualification, is presented. The major drawbacks of the above approach, such as the large amount of testing required and the impossibility of achieving the required weight efficiency of aircraft, are shown and the basic principles of a composite-friendly certification approach are formulated. The necessity to capture the impact of manufacturing factors on structural performance on all scales of the Building Block is stressed. A brief review of domestic studies on simulation of the influence of process parameters on the strength of structures as applied to processes currently used in the aviation industry is offered.     

引进合金钢标准物质复验

简单介绍了对引进国外合金钢标准物质分析复验情况,合金铜标准物质复验分析中使用的仪器和方法。对于适合微量元素钼、钴和铜的分析方法进行了研究。与国内标准物质进行了比较,经不同人员、不同方法、不同仪器验证,其均匀性、稳定性好,定值准确,各元素覆盖范围宽,可以作为标准物质使用,使用过程中必须定期复验。通过本文的总结,使大家对合金钢标样的国内外现状有更清晰的认识,更准确地应用国外的标准物质。     

微区原位元素及同位素分析标准物质研究进展

微区原位分析技术具有简单、快速、实时在线、空间分辨率高等优点,近年来广泛应用于地球科学、材料科学、生命科学等领域.微区原位分析时,样品前处理过程的省略不可避免地产生显著的基体效应,制约着微区原位分析结果的准确性和可靠性.在测量中使用微区分析标准物质,尤其是与待测样品基体匹配的标准物质对结果进行校正,是克服基体效应最直接...     

针对电梯结构强度的CAE分析

采用大型有限元软件Ls-dyna,根据国家《轿壁机械强度》试验标准,用非线性隐式有限元方法对某型观光电梯整体结构进行了强度仿真分析,所建立的三维仿真模型考虑复杂整体电梯结构中各部件的相互作用关系,分析得到在任意载荷作用下所产生的变形与应力分布,此方法可以为企业电梯产品的结构设计,质量鉴定提供参考依据。     

Novel method for evaluating surface roughness by grey dynamic filtering

The evaluation of surface roughness is of great importance for manufacturing industries as the roughness of a surface has a considerable influence on its quality and the function of products. For surface roughness evaluation, to find an appropriate reference line is of the utmost importance. A smooth grey reference line obtained by grey dynamic filtering is proposed to evaluate surface roughness. The primary sampling data of the measured surface need not obey the typical distributions and the surface profile with less data can also be evaluated without losing primary data. Through sample analysis, the grey reference line is well consistent with ISO Gaussian reference line and their evaluation results for surface roughness are in agreement. The grey reference line can be used as one of complements for Gaussian reference line.