基于噪声模板与互相关计算的涡街流量计抗强振动方法  

The Anti-strong Vibration Method Based on Noise Templateand Cross Correlation Calculation for Vortex Flowmeter

作　　者：徐科军[1,2] 王沁[1] 方敏[1] 邵春莉 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]工业自动化安徽省工程技术研究中心,安徽合肥230009

出　　处：《计量学报》2015年第1期37-42,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金(61074164)

摘　　要：根据涡街流量计在工作现场受强振动噪声干扰的情况，搭建振动实验平台，进行振动实验。对采集的数据进行功率谱分析和带宽特征分析，建立噪声模板，并量化描述噪声的带宽特性。进行噪声模板与传感器输出信号功率谱的互相关计算，提出利用噪声和涡街信号归一化互相关系数曲线进行噪声判别的抗强振动干扰的方法。对振动实验中采集的传感器数据进行处理，验证了该方法的有效性。A vibration experimental set-up of the vortex flowmeter is built and the vibration experiments are performed according to practical conditions of vortex flowmeter subjected to the strong vibration noise in industrial fields. The experimental data are analyzed by the power spectrum to obtain the features of frequency bandwidth. The noise templates are built up, and the frequency bandwidth characteristics of noise are described quantitatively. Cross correlation between the noise template and the power spectrum of vortex sensor output signal is calculated. A new kind of method is proposed by using the normalized cross correlation coefficient curves of the noise and vortex signal so as to distinguish the vortex signal from the strong vibration noise. The experimental data collected in the vibration experiments are processed with this algorithm to verify its effectiveness.

关 键 词：计量学 涡街流量计 强振动干扰 噪声模板 互相关计算 归一化互相关系数曲线 

分 类 号：TB937[一般工业技术—计量学]