冲击加速度国际关键比对与参考值确定

International Key Comparison of Shock Acceleration and Determination of the Reference Value

介绍了中国计量科学研究院主导的冲击加速度国际关键比对(CCAUV.V-K4)。分析了比对样品冲击测量链各部分动态特性,并与实验室实际校准的冲击加速度激励信号相结合,说明了作为测量结果的冲击灵敏度与冲击激励的关系。针对比对参考值及其相应不确定度计算的问题,详细说明了3种方法的计算过程,包括国际比对推荐的计算方法和2种基于贝叶斯推断的计算方法。特别对基于贝叶斯统计的方法,结合实际校准过程的信息,采用了不同的统计模型和先验分布,利用马尔科夫链-蒙特卡洛(MCMC)数值计算方法得到了比对参考值的后验分布。对3种方法计算结果的进行了比较,并说明了3种方法的统一性及优缺点。

The National Institute of Metrology,as pilot laboratory for the first international key comparison for shock acceleration(CCAUV.V-K4)is proposed.Technical protocol is illustrated by combination of dynamic characteristics of shock acceleration measuring chain and spectral contents of shock excitation.Three different approaches are used to calculate the reference value of comparison,including recommended method by international comparison and two methods based on Bayesian inference.It is argued that Bayesian approach with different statistical model is compatible with the practice of metrology,with different prior distribution and MCMC method to obtain the posterior distribution.The equivalence and divergence of three methods are illustrated through comparison of results obtained.