计量学报2024，Vol.45Issue(9)：1348-1352,5.DOI:10.3969/j.issn.1000-1158.2024.09.12
基于数据拟合法的三角形薄壁堰明渠流量测量不确定度优化
Optimization of Flow Measurement Uncertainty in Open Channel with Triangular Thin-walled Weir Based on Data Fitting Method
摘要
Abstract
Aiming at the problem of low measurement accuracy of triangular thin-walled weir open channel flowmeter when used at non-fixed points,based on the uncertainty pre-assessment results,it is proposed to use curve fitting instead of linear interpolation to calculate the flow coefficient,and a digital output magnetostrictive water level sensor is used to measure the water head,which significantly reduces the uncertainty items that contribute more to the original method.The frequency sampling method is improved based on the Froude's similarity criterion,which improves the accuracy level of the measurement results.The uncertainty of the measurement method is improved from 1.6％to 0.56％.The calibration experiments of the triangular thin-walled weir open-channel flowmeter are carried out by the standard meter method open-channel flow rate standard device,and the experimental results show that the measurement error is reduced from 2％to less than 1％after the improved method.关键词
流量计量/三角形薄壁堰/明渠流量计/拟合算法/采样频率/不确定度/磁致伸缩水位传感器Key words
flow measurement/triangular thin-walled weirs/open channel flowmeter/fitting algorithm/sampling frequency/uncertainty/magnetostrictive water level sensor分类
通用工业技术引用本文复制引用
高明,郭辉,贾志卓..基于数据拟合法的三角形薄壁堰明渠流量测量不确定度优化[J].计量学报,2024,45(9):1348-1352,5.基金项目
国家市场监督管理总局科技计划(2020MK011,2021MK017) （2020MK011,2021MK017）
河北省市场监督管理局计量技术规范制修计划(冀市监函[2023]201号) （冀市监函[2023]201号）
河北省市场监督管理局地方标准制修订项目(冀市监函[2023]403号) （冀市监函[2023]403号）
