涡街信号处理中基于FFT幅值区间约束的自适应滤波算法  

Adaptive Filter Algorithm with FFT Interval-amplitude Constraint in Vortex Signal Processing

作　　者：樊辰阳 陈洁[1] 刘晓佳[1] 黄绍锋[1] 丁旭冰 

机构地区：[1]上海大学机电工程与自动化学院,上海200072 [2]浙江迪元仪表有限公司,浙江义乌322001

出　　处：《工业控制计算机》2015年第4期54-56,共3页Industrial Control Computer

摘　　要：在对涡街流量计的信号进行处理时,一般着重研究如何滤除干扰信号,对有效的涡街信号进行统计分析。但当现场环境恶劣时,信噪比很小,噪声的强度甚至超过有效信号,很难区分其是否为噪声,从而无法对其进行有效过滤。通过对涡街信号特点的研究,分析FFT在涡街信号处理中的可行性,提出FFT幅值区间约束的概念,对中低频涡街信号频率进行估计,并用该估计频率设计自适应滤波器进行信号处理。实验结果表明,该方法可得出很好的测量精度,并且有很强的抗噪声能力。In the vortex fIowmeter signaI processing,researchers areused to focus on how to fiIter the noise signaI to anaIyse the frequency of effective vortex signaI.In adverse circumstances,the signaI-to-noise ratio is smaI that the strength of the noise even more than effective signaIs,so it is difficuIt to distinguish whether it is noise.It is unabIe to carry on the effective fiIter. In this paper,through the study of the characteristics of the vortex signaI andthe feasibiIity of FFT anaIysis in the vortex sig-naI processing,and puts forward the concept of intervaI-ampIitude constraint by FFT,to estimate the frequency of Iow-fIowvortex signaI.Then the estimated frequency is used to design adaptive fiIter for signaI processing.

关 键 词：涡街信号 幅值约束 自适应滤波 抗噪声 

分 类 号：TN911.7[电子电信—通信与信息系统]