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本文介绍了5kNm立式参考式扭矩标准装置的结构形式和组成,并详细描述了有关参考式装置的结构设计及有限元分析、扭矩加载系统以及装置的超限保护机构的研究过程和研究成果。通过不确定度评定,装置的扩展不确定度Urel=0.05%(包含因子k=2)。参考式扭矩标准装置以其高性价比和快速校准的特点,满足了广大计量机构扭矩传感器校准的需求。 相似文献
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本文介绍了扭矩扳子检定仪的两种校准方法,对标准扭矩扳子的校准过程进行了受力分析,对用于标准扭矩扳子校准的参考式扭矩标准装置的结构与工作原理进行了研究,研制了基于气浮轴承的标准扭矩扳子校准装置,其扩展不确定度优于0.05%(k=2)。 相似文献
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本文介绍了克组F2等标准砝码质量值测量结果不确定度评定的过程。即依据检定规程,确定测量方法,建立被测量和影响量之间的数学模型,并计算出各分量的标准不确定度和测量结果扩展不确定度。 相似文献
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实船试航中影响船速测量结果的因素很多,对其进行测量不确定度分析时应考虑的不确定度来源也有很多。采用“测量不确定度表示指南”规定的方法,将船速算法作为不确定度源,对其测量结果进行了不确定度分析。不确定度分析以某油船为例,分别考虑了实际航速平均法和逐点法两种算法,并对两种算法得到的结果作了讨论。 相似文献
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通过对光学平行装置精度测量及数据的分析处理,确定了均方根、合成不确定度和扩展不确定度,为光学平行装置测量精度的校准提供了依据。 相似文献
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A first order mass balance of six different trace metals (Mn, Fe, Pb, Zn, Cu, Ni) was presented for a 1-year period for the different compartments of the Adriatic Sea: compartment 1 (northern Adriatic Sea), compartment 2 (central Adriatic Sea and surface layer of the southern Adriatic Sea) and compartment 3 (deep water of the southern Adriatic Sea). The Adriatic Sea appeared to be a source of dissolved Cu, Mn and Fe for the Mediterranean Sea through the Strait of Otranto whereas for dissolved Zn and Pb the Adriatic Sea appeared to be a net sink. For dissolved Ni, inputs and outputs through the Strait of Otranto balanced each other. The residence times of all metals in compartment 1 were significantly shorter than that of water indicating significant removal. In compartments 2 and 3, residence times of Mn and Fe were relatively short suggesting removal from the water column whereas for the other metals their residence times were similar to that of water. Calculations of turnover times of metals with respect to different processes showed that in compartments 1 and 2, sedimentation was the main process that affected the content of the reservoirs whereas in compartment 3, the water flux exchanges played an important role for Zn, Cu and Ni.Most of the metals clearly undergo a very dynamic cycle of sedimentation/remobilization particularly in the Northern Adriatic Sea. In the northern Adriatic Sea, most of the Mn and Fe in deposited sediment were remobilized. This was related to diagenetic processes involving the utilisation and solubilisation of Mn and Fe oxides, which occur in the surface of the sediment in the northern Adriatic Sea. In the central Adriatic Sea, remobilization of Mn and Fe was less than in the northern Adriatic Sea, suggesting that diagenesis processes appear deeper in the sediment. Advective transport of sediment was a major source of metals for the deep basin. As much as 80% of the sediments in the South Adriatic Pit might be advected from the shelf. Remobilization fluxes in the South Adriatic Pit were significantly less than in the Northern and Central Adriatic Sea reflecting hemi-pelagic sediments. 相似文献
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Abstract This article suggests a method of estimating economic losses for estuary‐dependent faunal species under conditions whereby the impact of a given degrading development on a particular estuary has a significant degree of uncertainty associated with it. The approach draws on standard theories from a variety of disciplines to provide an operational procedure capable of joint application by biologists, economists, and other related disciplines with working responsibility in the subject area. Consideration is given to probability estimation of possible impacts, sensitivity to underlying assumptions, and decisional safety under conditions of uncertainty. Applied results are demonstrated in a simulation of a negative developmental impact on the estuary‐dependent salmon resources of the Fraser River in British Columbia. 相似文献