基于蒙特卡罗法的冲击力溯源系统不确定度评定  

Uncertainty Evaluation on the Traceable Measurement System of the Impact Force Based on a Monte Carlo Method

作　　者：江文松 王中宇[2] 罗哉[1] 张力 胡晓峰[1] JIANG Wen-song;WANG Zhong-yu;LUO Zai;ZHANG Li;HU Xiao-feng(School of Measurement and Testing Engineering,China Jiliang University,Hangzhou,Zhejiang 310018,China;School of Instrumentation Science and Opto-electronics Engineering,Beihang University,Beijing 100191,China;Changcheng Institute of Metrology&Measurement,Beijing 100095,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]北京航空航天大学仪器科学与光电工程学院,北京100191 [3]北京长城计量测试技术研究所,北京100095

出　　处：《计量学报》2020年第4期448-454,共7页Acta Metrologica Sinica

基　　金：国家重点研究计划(2018YFF01012006,2017YFF0206306);国家自然科学基金(51575032);浙江省自然科学基金(LQ20E050016);浙江省重点研究计划(2018C01063)。

摘　　要：利用蒙特卡罗方法对多变量的冲击力溯源系统进行不确定性量化评定。该方法首先建立冲击力溯源系统各不确定变量的表征模型;再根据抽样空间相邻迭代解的误差限,建立样本量的适应度函数;最后利用适应度函数使冲击力测量模型的输入变量最佳逼近总体分布。为了验证该方法的有效性,利用该方法对冲击力溯源系统进行不确定度评定,评定结果表明,在95%的置信水平上,冲击力溯源系统的相对扩展不确定度优于0.818%,其不确定性主要来源于落锤上表面加速度分布不均匀和横向偏摆。A Monte Carlo method(MCM)is applied to evaluate the uncertainty of a traceable measurement system of the impact force with multi-component characteristics.First,the uncertainty components are represented by analyzing its error generation principles.Second,the relative error of adjacent solutions are applied to build the fitness function of the sample size.Third,the inputs of the traceable measurement system can approximate the population distribution by dynamic regulating the sample size of the MCM.The MCM is verified by applying its model to a traceable measurement system of the impact force.The experimental result shows that the relative expansion uncertainty is 0.818% with 95% degree of confidence.It reveals that both the inhomogeneous distribution of acceleration and the lateral oscillations on the hammer are the main uncertainties of this system.

关 键 词：计量学 冲击力溯源 不确定度评定 蒙特卡罗法 适应度函数 

分 类 号：TB936[一般工业技术—计量学]