作者：黄丹平1,2,3, 汪俊其1, 于少东1,2, 王磊1
作者单位：1. 四川理工学院, 四川 自贡 643000;
2. 人工智能四川省重点实验室, 四川 自贡 643000;
3. 过程装备与控制工程四川省高校重点实验室, 四川 自贡 643000
关键词：科式质量流量计;非整周期;改进的Hilbert算法;相位差
摘要：
针对工程应用中现有算法处理科式质量流量计两路时变信号相位差计算准确度不高的问题,采用一种基于小波变换和改进Hilbert算法结合的方法,对其两路时变信号进行分析处理,从而快速、准确计算出两路输出信号相位差。该算法首先采用基于小波变换重构的方法对信号进行逐层滤波,滤除现场环境中各种干扰信号并保持检测正弦信号滤波后相位不变,最后应用改进Hilbert算法计算出所测两路信号实时相位差。通过实验可知:该算法可行有效,实时性强,测量准确度高,能够实现科式质量流量计的高准确度测量。
Signal processing of coriolis mass flow meters based on wavelet transform and improved Hilbert transform
HUANG Danping1,2,3, WANG Junqi1, YU Shaodong1,2, WANG Lei1
1. Sichuan University of Science & Engineering, Zigong 643000, China;
2. Artificial Intelligence Key Laboratory of Sichuan Province, Zigong 643000, China;
3. Sichuan Provincial Key Lab of Process Equipment and Control, Zigong 643000, China
Abstract: The accurate measurement of the phase difference plays a key role in the Coriolis Mass Flow Meter. A new method based on wavelet transform and improved Hilbert algorithm is used to analyze and deal with the two signals because it is no high precision that phase difference of two signals were measured by existing algorithms in engineering application. First of all, the algorithm based on the reconstruction of the wavelet transform method is applied to filter out all kinds of interference signals in the field environment and it can keep the phase of the sinusoidal signal constant after two signals were filtered. And then the Hilbert algorithm is used to calculate the phase difference between two signals. Experiments show that improved algorithm is feasible, real time and high accuracy, and can realize the high precision measurement of the Coriolis Mass Flow Meter.
Keywords: coriolis mass flow meter;non integral period;improved Hilbert transform;phase difference
2016, 42(6): 37-41 收稿日期: 2015-09-23;收到修改稿日期: 2015-11-03
基金项目: 人工智能四川省重点实验室项目(2013RYY03);过程装备与控制工程四川省高校重点实验室项目(GK201209);四川理工学院校内科研项目(2012KY03)
作者简介: 黄丹平(1969-),男,副教授,博士后,研究方向为测控技术。
参考文献
[1] 沈延鳌,涂亚庆,李明,等. 数据延拓式相关的相位差测量方法及验证[J]. 仪器仪表学报,2014,35(6):1331-1336.
[2] 杨辉跃,涂亚庆,张海涛,等. 一种基于SVD和Hilbert变换的科式流量计相位差测量方法[J]. 仪器仪表学报,2012, 33(9):2101-2106.
[3] 路伟涛,杨文革,洪家财. 新的小波滤波算法及其甚长基线干涉测量中的应用[J]. 信号处理,2014,30(5):553-560.
[4] 涂亚庆,沈延鳌,李明,等. 基于多次互相关的非整周期信号相位差测量算法[J]. 仪器仪表学报,2014,35(7):1578-1583.
[5] 沈延鳌,涂亚庆,刘翔宇,等. 基于相关原理的非整周期相位差测量算法[J]. 仪器仪表学报,2014,35(9):2153-2160.
[6] 刘维来,赵璐,王克逸,等. 基于希尔伯特变换的科式流量计信号处理[J]. 计量学报,2013,34(5):446-451.
[7] MICHELETI R. Phase-angle measurement between two sinusoidal signals[J]. IEEE Trans Instrum Meas,1991(40):40-42.
[8] 叶敦范,李星,等. 基于LabVIEW的多重相关法测量相位研究[J]. 中国测试,2014,40(6):95-98.
[9] 徐科军,徐文福. 基于AFF和SGA的科式质量流量计信号处理方法[J]. 计量学报,2007,28(1):48-51.
[10] 刘玉周,赵斌. 移相相关法计算相位差的研究[J]. 激光技术,2014,38(5):638-641.
