Modelling and tracking a vortex flow-meter signal

被引：52

作者：

Ghaoud, T ^{[1
]}

Clarke, DW ^{[1
]}

机构：

[1] Dept Engn Sci, Oxford OX1 3PJ, England

来源：

FLOW MEASUREMENT AND INSTRUMENTATION | 2002年 / 13卷 / 03期

关键词：

vortex flow-meter; signal modelling; zero-crossing algorithm;

D O I：

10.1016/S0955-5986(02)00020-1

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The piezoelectric sensor in a vortex-shedding flow meter produces a raw signal whose average frequency indicates volumetric flow rate. Imposed on this signal are amplitude and frequency variations, together with noise caused by plant-specific pressure pulsations. The objective of this paper is to provide and verify a simulation model of the overall signal, so that different frequency-tracking methods can be compared. In particular the performance of a zero-crossing algorithm is evaluated. A prefilter is designed to extend the tracking ability to lower flow rates, where the signal:noise ratio is poor. Experimental tests in real time on a flow rig demonstrate the improvement in turn-down by a factor of two. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：103 / 117

页数：15

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