摘要
为实现科氏流量计实际应用中测量性能的最大化,提出一种基于相关运算和Hilbert变换的正交解调算法(CH-QD算法).该算法利用自相关的同频余弦特性和Hilbert变换的相移特性产生正交解调所需的同频参考信号,有效解决了传统正交解调算法需预知信号频率、对频率检测算法的性能敏感等问题,提高了算法的检测精度,并实现了信号频率、相位差的联合估计.性能仿真测试表明,本文算法具有较高的检测精度、抗噪性和动态跟踪性能.在基于TMS320F28335DSP研制的科氏流量计变送器上实现本文算法,并进行性能分析和水流量标定实验.标定结果表明,在量程比20∶1的范围内,系统测量误差小于0.1%,重复性小于0.05%,具有较好的实用价值.
In order to maximize the measurement performance of Coriolis flowmeter in practical application,a quadrature demodulation algorithm based on correlation operation and Hilbert transform(CH-QD algorithm)is proposed.The proposed algorithm uses the same-frequency cosine frequency characteristic of autocorrelation and the phase-shift characteristic of Hilbert transform to generate the reference signals required by quadrature demodulation,which effectively solves the problem that the traditional quadrature demodulation algorithm needs to predict the signal frequency and is sensitive to the performance of the frequency detection algorithm,which improves the detection accuracy of the algorithm,and realizes the joint estimation of signal frequency and phase difference.Simulation results show that the proposed algorithm has high detection accuracy,noise resistance and dynamic tracking performance.Based on TMS320F28335DSP,the algorithm is implemented on Coriolis flowmeter transmitter,and the performance analysis and water flow calibration experiments are carried out.The calibration results show that the measurement error of the system is less than 0.1%and the repeatability is less than 0.05%in the range of range ratio of 20∶1.
作者
鲍喜荣
张红
张石
BAO Xi-rong;ZHANG Hong;ZHANG Shi(School of Computer Science&Engineering,Northeastern University,Shenyang 110169,China)
出处
《东北大学学报(自然科学版)》
北大核心
2025年第5期20-28,共9页
Journal of Northeastern University(Natural Science)
基金
辽宁省科学技术计划项目(2021JH1/10400011)
辽宁省科学技术计划项目(2020JH2/10100031)。
