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Measurement of unsteady flowrate through pipelines and equipment is very important to analyze dynamic characteristics of hydraulic control systems.In this research, we propose two approaches, the remote and quasi-remote measurement method for instantaneous flowrate using hydraulic pipeline dynamics which are well-established in the form of transfer matrix relating to the pressures and flowrates between two cross sections (distance L) of the pipeline.In particular, the remote measurement method of instantaneous flowrate for estimating flowrate through an arbitrary cross section from the measured values of pressure and flowrate at the another remote cross section are investigated in detail.The estimated flowrate waveforms are compared with the measured flowrate waveforms directly by another cylindrical choke type instantaneous flowmeter, which is used for calibration. The excellent agreement obtained between the estimated and directly measured flowrate waveforms illustrates the validity of the proposed method.It is shown that the remote measurement method of instantaneous flowrate proposed here is useful in estimating flowrate through the arbitrary cross section of hydraulic pipeline under unsteady laminar flow.

An approach for remote measurement of instantaneous flowrate by making use of hydraulic pipeline dynamics.