Digital Drive Method Based on Damped-Signal Tracking for Coriolis Mass Flowmeter

Aiming at the problem that conventional digital driving methods cannot accurately track the natural frequency changes of flow tubes, we analyzed the sources of tracking errors in the natural frequency of flow tubes and proposed a new digital driving method. The method utilizes the amplitude of flow tube vibration to monitor changes in natural frequency, and tracks the natural frequency of the flow tube by estimating the frequency of the attenuation signal after stopping vibration. Then the hardware and software design and implementation of the Coriolis mass flowmeter (CMF) transmitter embedded with the proposed method was carried out, and experiments were conducted on the micro-flow differential CMF experimental platform. The experimental results illustrate that the proposed method can adjust the driving signal frequency timely when the natural frequency changes, improve the tracking accuracy of the digital driving natural frequency, and make the system have better driving performance; when the water temperature rises from [Formula: see text] to [Formula: see text], the measurement accuracy of the CMF embedded in the proposed digital driving method is improved by 37.87% compared to conventional digital drive.