天平校准不确定度的一种评估方法  

A method to estimate the balance calibration uncertainty

作　　者：刘春风[1] 熊琳[1] 刘家骅[1] 李海燕[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《实验流体力学》2016年第2期84-90,共7页Journal of Experiments in Fluid Mechanics

摘　　要：建立了一套完整的天平校准不确定度评估流程:单独评估校准系统的不确定度、基于检验载荷的残差,通过偏差极限和精度极限评估其它各误差源引入的不确定度、合并得到校准不确定度结果。以BCS-100天平校准系统为例,选择天平TG624C重复校准7次,实现了该评估方法。评估结果表明:(1)天平安装的滚转角和加载时天平的角位移,二者引入的不确定度为主要分量,应作为技术改造的重点;(2)Q、Z和My3个小量单元,受Y和Mz2个大量的干扰,其不确定度值稍大;(3)精度极限相比于偏差极限要小很多。建立的整套评估方法对于其他校准系统也是通用的。A complete uncertainty estimation process for balance calibration is established：assessing the calibration system uncertainty,assessing the bias limit and precision limit based on checking load residuals to estimate the uncertainty from other errors,and combining them to obtain the total uncertainty result.For the BCS-100 calibration system,balance TG624 Cis calibrated seven times repeatedly to implement the method.The result shows that：（1）The uncertainty caused by the roll angle of balance installation and the angular displacement of balance in the calibration are the main components,which shows the direction to upgrade the calibration system;（2）Due to the interference of Yand Mz,the uncertainties of Q、Zand Myare larger;（3）The precision limit is much smaller compared to the bias limit.The method is also applicable to other calibration systems.

关 键 词：不确定度 校准系统 偏差极限 精度极限 重复 

分 类 号：V211.752[航空宇航科学与技术—航空宇航推进理论与工程]