基于自适应陷波器的科氏流量计信号频率跟踪新方法

New frequency tracking method for coriolis mass flowmeter based on adaptive notch Filter

为提高对科氏流量计信号频率随机缓慢变化的持续跟踪能力,以对格型ANF、简化格型ANF和基于SMM的新式ANF三种典型自适应陷波器的性能比较分析为基础,提出了一种科氏流量计信号频率跟踪新方法。该方法对频率、幅值和相位均随机游动变化的科氏流量计信号,首先采用新式ANF快速检测信号频率并作短时频率跟踪,待其收敛后简化格型ANF开始并行工作,在简化格型ANF收敛后取代新式ANF持续跟踪信号频率的变化。仿真结果表明,本文方法比格型ANF方法收敛速度更快、频率跟踪精度更高,比单一采用新式ANF方法计算更为简便,是一种科氏流量计信号处理的有效方法。

In order to improve the long-playing frequency tracking ability,a new frequency tracking method for Coriolis Mass Flowmeter is proposed by compared and analyzed the performances of the lattice-based adaptive notch filter（LANF）,the simplified lattice-based adaptive notch filter（SLANF） and the new IIR adaptive notch filter based on SMM.The new IIR adaptive notch filter is applied to detect and track the signal frequency initially whose frequency,amplitude and phase are time-varying based on the random walk model.As its algorithm converges,the SLANF starts to work.After the SLANF algorithm converges,the time-varying frequencies are tracked by SLANF instead of the new IIR ANF.The simulations confirm the validity of the presented method and show that the presented method has advan-tages of fast convergence rate,higher tracking accuracy than the lattice-based adaptive notch filter method and simpli-fier than using the new IIR adaptive notch filter method merely.