标准表法流量计算及不确定度评估分析
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摘要
以圆柱齿轮流量计做为标准流量计为例,介绍了在标准表法流量标准装置中非定点使用的标准流量计的几种典型流量计算方法,并给出各种流量算法引入的不确定度评定方法。实例对比表明,采用最小二乘法拟合计算,选择与流量计自身特性匹配的拟合阶次可有效降低算法引入的不确定度;选用流量修正值计算流量,对于低流量区域算法引入的相对不确定度较大;采用仪表系数和流量修正系数计算流量引入的不确定度比较接近。
Taking the cylindrical gear meter that is used as master flow meter as an example,several typical flow calculation methods for the master flow meter used in the non-fixed point in the standard flow facility by master meter are introduced,and the uncertainty of each flow calculation method is evaluated. The comparison of the examples shows that using the least squares fitting calculation and selecting the fitting order matching the characteristics of the flowmeter can reduce the uncertainty introduced by the algorithm obviously,the method of selecting the flowrate correction value to calculate the flow rate is relatively inefficient for the low flow range,and the uncertainty introduced by using the meter factor is relatively close with that introduced by using the flow rate correction coefficient.
Taking the cylindrical gear meter that is used as master flow meter as an example,several typical flow calculation methods for the master flow meter used in the non-fixed point in the standard flow facility by master meter are introduced,and the uncertainty of each flow calculation method is evaluated. The comparison of the examples shows that using the least squares fitting calculation and selecting the fitting order matching the characteristics of the flowmeter can reduce the uncertainty introduced by the algorithm obviously,the method of selecting the flowrate correction value to calculate the flow rate is relatively inefficient for the low flow range,and the uncertainty introduced by using the meter factor is relatively close with that introduced by using the flow rate correction coefficient.
引文
[1]苏彦勋.流量检测技术[M].北京:计量质检出版社.2012.
[2]王池,王自和.流量测量技术全书[M].北京:化学工业出版社,2012.
[3]国家质量监督检验检疫总局.JJG 643-2003标准表法流量标准装置检定规程[S].北京:中国计量出版社,2003.
[4]周艳茁.Excel在最小二乘法不确定度评定中的应用[J].理化检验(化学分册),2006,42(6):445-447.
[5]梁志国,孙璟宇,李滨.最小二乘独立线性度的测量不确定度[J].计测技术,2002,22(4):28-33.
[6]金正一,李凤岐.一元线性参数最小二乘法中斜率及截距的不确定度[J].沈阳工业学院学报,2000,19(1):73-76.
[7]李慎安.JJF 1059-1999《测量不确定度评定与表示》讨论之三十六采用内插计算结果的不确定度[J].工业计量,2011,21(5):27-27.
[8]黄向阳,李长武,罗强.标准表法气体流量标准装置及不确定度分析[J].计量技术,2006(7):45-48.
[9]JJG 667-2010液体容积式流量计检定规程[S].北京:中国计量出版社,2010.
[10]刘海生,占树言,谢文华,等.基于间隙流态外层流的容积式流量计计量特性研究[J].机床与液压,2017,45(7):44-48.
[2]王池,王自和.流量测量技术全书[M].北京:化学工业出版社,2012.
[3]国家质量监督检验检疫总局.JJG 643-2003标准表法流量标准装置检定规程[S].北京:中国计量出版社,2003.
[4]周艳茁.Excel在最小二乘法不确定度评定中的应用[J].理化检验(化学分册),2006,42(6):445-447.
[5]梁志国,孙璟宇,李滨.最小二乘独立线性度的测量不确定度[J].计测技术,2002,22(4):28-33.
[6]金正一,李凤岐.一元线性参数最小二乘法中斜率及截距的不确定度[J].沈阳工业学院学报,2000,19(1):73-76.
[7]李慎安.JJF 1059-1999《测量不确定度评定与表示》讨论之三十六采用内插计算结果的不确定度[J].工业计量,2011,21(5):27-27.
[8]黄向阳,李长武,罗强.标准表法气体流量标准装置及不确定度分析[J].计量技术,2006(7):45-48.
[9]JJG 667-2010液体容积式流量计检定规程[S].北京:中国计量出版社,2010.
[10]刘海生,占树言,谢文华,等.基于间隙流态外层流的容积式流量计计量特性研究[J].机床与液压,2017,45(7):44-48.