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首页> 外文会议>International Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation; 20070924-26; Vienna(AT) >Problems in the averaging of neutron diffraction stress data from round- robin campaigns
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Problems in the averaging of neutron diffraction stress data from round- robin campaigns

机译：循环运动中子衍射应力数据平均的问题

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摘要

In recent years the use of a special Bayesian approach on averaging 'round-robin' residual stress data has been implemented. This averaging approach is useful in that it copes with the situation where systematic errors have occurred in one or more of the measurements and thus diminishes the influence of these particular 'wrong value' outlier data points. The analyses not only take into account the measurand value, but also the uncertainties associated with each measurand. It should deal with data that may contain individual members with uncertainties larger than the stated error and assumes that the quoted error bar is only a lower bound on the uncertainty. This work shows what could happen when there is a 'strong mismatch' in uncertainties when averaging over a limited amount of data. It has been observed that in a case where there are few data points (for example 5 or less), a strong bias can occur towards data points with a relatively small quoted uncertainty compared to other data points with larger quoted uncertainties. A 'mismatch' in uncertainty quotation can arise when averaging very good data with poorer data or when averaging with data obtained from other measurement techniques. This effect is demonstrated in this work by using fictitious data and also based on the example of real measurement data obtained by neutron diffraction.
机译：近年来，已经采用了一种特殊的贝叶斯方法来平均“循环”残余应力数据。这种平均方法很有用，因为它可以应对一种或多种测量中发生系统误差的情况，从而减少了这些特定“错误值”离群数据点的影响。这些分析不仅考虑了被测量价值，而且还考虑了与每个被测量有关的不确定性。它应该处理的数据可能包含不确定性大于所述误差的单个成员，并假定引用的误差线仅是不确定性的下限。这项工作显示了在对有限数量的数据进行平均时，如果不确定性存在“严重不匹配”，将会发生什么。已经观察到，在数据点很少（例如5个或更少）的情况下，与具有较大引用不确定性的其他数据点相比，具有较大引用不确定性的数据点可能会出现强烈的偏差。当将非常好的数据与较差的数据进行平均时，或者与从其他测量技术获得的数据进行平均时，不确定性报价中可能会出现“不匹配”的情况。通过使用虚拟数据并以中子衍射获得的实际测量数据为例，可以证明这一效果。

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