FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment, namely to methods and facilities intended for measurement of liquid flow rate, and can be used in various industries for purposes of control, regulation and accounting of medium flows. In particular, the invention can be used for determination of liquid flow rate in a well by a vortex flow meter under conditions of action of low-frequency vibration loads. Method of determining liquid flow rate consists in continuously receiving a signal which includes a useful frequency component which characterizes the velocity of the liquid flow and a noise frequency component which characterizes the intensity of vibration. PT signal obtained at the current moment of time is digitized and placed into the spectrum. Vibration sensor measures vibration, digitizes the measured VS signal and spreads it into a spectrum. Further, the useful signal spectrum is picked up by subtracting the signal spectrum VS from the spectrum of the PT signal. Derived spectrum of the useful signal is used to calculate the vortex generation frequency from which the fluid flow rate is determined, which determines the flow rate of the liquid at the current moment in order to transmit information on the determined liquid flow to the consumer. Vortex flow meter configured to supply voltage to power-requiring elements and comprising series-connected primary transducer (PT), processing device (hereinafter, PD), vibration sensor (further, VS). PD is configured to decompose in the spectra of the digitized PT signal and the VS signal, extracting the useful signal spectrum from the PT signal spectrum, application of a useful adaptive filtration signal in the form of a Hamming Window to the said selected spectrum and evaluation of weight functions, calculation of the vortex generation frequency, calculation of the liquid flow rate value at the current moment in time, automatic adjustment of the PT signal level, filtration of its low frequency.
EFFECT: high accuracy of determining the frequency of vortex formation, especially during strong vibration action due to: higher vibration stability of the vortex flow meter, possibility of excluding false measurement of flow rate and increasing the minimum measured level of flow rate in conditions of influencing the flow meter of dynamically varying vibration loads.
12 cl, 6 dwg
