Dynamic testing of mass flowmeter U-tube based on EMI technology

ZHANG Jun，LUO De-chang，DING Peng-fei
(School of Mechanical Engineering，Anhui University of Science and Technology，Huainan 232001，China)

Abstract: Aiming at the problem that the frequency characteristic of mass flowmeter U-tube (hereinafter referred to as U-tube) had great influence on the performance of mass flowmeter, the U-tube was taken as the research object, the influence of admittance and impedance on the frequency characteristics under the dynamic signal was studied. Firstly, the acoustic experiment and piezoelectric impedance experiment platform were set up to carry out the acoustic and impedance experiments on U-tube. Secondly, the modal analysis of U-tube was carried out, the results of experiment were compared with the results of modal analysis, both results are consistent. Finally, the impedance experimental platform under dynamic signal on U-tube was built to test the resonance region, low-frequency non resonance region and high-frequency non resonance region of the U-tube. The research results indicate that when the sweep signal is close to the added resonance signal, the obvious resonance phenomenon was found, the influence of resonance signal on the inherent characteristics of U-tube is greater than that of non-resonant signal.
Key words: electro-mechanical impedance（EMI）technology; mass flowmeter U-tube; dynamic signal; acoustical experiment；impedance experiment