流量仪表的几种测量方法分析及改进措施
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摘要
流量是工业测控领域十分重要的检测参数,其中相位差的测量精度是影响流量测量精度的关键因素之一。首先介绍了频谱分析法、相关分析法、希尔伯特变换法三种流量仪表中常用的相位差测量方法的基本原理,然后分别对其进行了误差分析,针对三种方法均存在非整周期采样问题,提出了一种抑制非整周期采样的办法,并详细阐述了改进措施的具体实现步骤。仿真分析了各种方法的优缺点,并对改进前后方法进行了对比分析,以证实改进措施的有效性。
Flowmeter plays an important role in modern industry, and the accuracy of phase difference measurement is a key factor which directly influences the accuracy of flow measurement. The fundamental principles of phase difference estimation methods for flowmeters are introduced firstly, including spectrum analytical method, correlation analytical method and Hilbert Transform method. Then, the error of the three phase difference estimation methods is analyzed. In order to improve the performance of phase difference estimation method under the non-integer period sampling conditions, a restrain measure is introduced, and the particular implement process is expounded. Simulation results verify the advantages and disadvantages of the three methods, along with the contrast analysis of the original and the revised method, which validated the effects for the revised measure.
Flowmeter plays an important role in modern industry, and the accuracy of phase difference measurement is a key factor which directly influences the accuracy of flow measurement. The fundamental principles of phase difference estimation methods for flowmeters are introduced firstly, including spectrum analytical method, correlation analytical method and Hilbert Transform method. Then, the error of the three phase difference estimation methods is analyzed. In order to improve the performance of phase difference estimation method under the non-integer period sampling conditions, a restrain measure is introduced, and the particular implement process is expounded. Simulation results verify the advantages and disadvantages of the three methods, along with the contrast analysis of the original and the revised method, which validated the effects for the revised measure.
引文
[1] 叶林,周弘,张洪,等.相位差的几种测量方法和测量精度分析[J].电测与仪表,2006,43(4):11-14.
[2] 沈廷鳌,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):1331-1337.
[3] 路艳洁,席志红,王姜铂.FFT法与数字相关法在相位测量上的比较[J].信息技术,2007(12):105-108.
[4] 左自强,徐阳,曹晓珑,等.计算电容型设备介质损耗因数的相关函数法的改进[J].电网技术,2004,28(18):53-57.
[5] 郑胜峰,陈素明,狄金海,等.一种基于多重互相关的相位差测量新方法[J].宇航计测技术,2012,32(1):34-40.
[6] 张海涛,涂亚庆,牛鹏辉.相位差测量的FFT法和DTFT法误差分析[J].电子测量与仪器学报,2007,21(3):61-65.
[7] DANIEL BELEGA,DARIO PETRI.Sine-wave parameter estimation by interpolated DFT method based on new cosine windows with high interference rejection capability[J].Digital Signal Processing,2014(33):60-70.
[8] 许珉,张文强,王兆强,等.基于加窗递推DFT算法的快速相位差校正法研究[J].电力系统保护与控制,2010,38(14):1-4.
[9] 肖树妹,梅海平,钱仙妹,等.基于希尔伯特变换的湍流随机相位差解调算法研究[J].光学学报,2011,31(7):41-45.
[10] 郭东亮,张铁军,戴宪华.基于信号延拓的采样信号频谱泄露抑制[J].仪器仪表学报,2010,31(3):536-540.
[11] 胡广书.数字信号处理—理论、算法与实现(第二版)[M].北京:清华大学出版社,2003.
[12] 吴国乔,王兆华.基于全相位的零相位数字滤波器的设计方法[J].电子与信息学报,2007,29(3):574-577.
[13] 梁志国,孙璟宇.信号周期的一种数字化测量方法[J].仪器仪表学报,2003,24(S1):195-198.
[2] 沈廷鳌,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):1331-1337.
[3] 路艳洁,席志红,王姜铂.FFT法与数字相关法在相位测量上的比较[J].信息技术,2007(12):105-108.
[4] 左自强,徐阳,曹晓珑,等.计算电容型设备介质损耗因数的相关函数法的改进[J].电网技术,2004,28(18):53-57.
[5] 郑胜峰,陈素明,狄金海,等.一种基于多重互相关的相位差测量新方法[J].宇航计测技术,2012,32(1):34-40.
[6] 张海涛,涂亚庆,牛鹏辉.相位差测量的FFT法和DTFT法误差分析[J].电子测量与仪器学报,2007,21(3):61-65.
[7] DANIEL BELEGA,DARIO PETRI.Sine-wave parameter estimation by interpolated DFT method based on new cosine windows with high interference rejection capability[J].Digital Signal Processing,2014(33):60-70.
[8] 许珉,张文强,王兆强,等.基于加窗递推DFT算法的快速相位差校正法研究[J].电力系统保护与控制,2010,38(14):1-4.
[9] 肖树妹,梅海平,钱仙妹,等.基于希尔伯特变换的湍流随机相位差解调算法研究[J].光学学报,2011,31(7):41-45.
[10] 郭东亮,张铁军,戴宪华.基于信号延拓的采样信号频谱泄露抑制[J].仪器仪表学报,2010,31(3):536-540.
[11] 胡广书.数字信号处理—理论、算法与实现(第二版)[M].北京:清华大学出版社,2003.
[12] 吴国乔,王兆华.基于全相位的零相位数字滤波器的设计方法[J].电子与信息学报,2007,29(3):574-577.
[13] 梁志国,孙璟宇.信号周期的一种数字化测量方法[J].仪器仪表学报,2003,24(S1):195-198.