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Modelling and tracking a vortex flow-meter signal

机译:建模和跟踪涡街流量计信号

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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.
机译:涡流流量计中的压电传感器产生原始信号,其平均频率表示体积流量。振幅和频率变化以及由工厂特定的压力脉动引起的噪声都施加在该信号上。本文的目的是提供并验证整个信号的仿真模型,以便可以比较不同的频率跟踪方法。特别是评估了过零算法的性能。预过滤器旨在将跟踪能力扩展到较低的流率,从而降低信噪比。在流动钻机上进行的实时实验测试表明,调节比降低了两倍。

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