Abstract
Nonlinear interference components exist in the output signals of dual-tube Coriolis mass flowmeters (CMFs) which affect the sensitivity and accuracy of the devices. This nonlinearity still appears under zero flow, which is manifested when the output signal contains a frequency doubling signal. This study (1) investigated an additional-mass method to suppress the nonlinear frequency doubling phenomenon, (2) established a coupling system vibration model with additional mass, built a dynamic differential equation for the vibration of the double-beam coupling system from the Lagrange equation, (3) obtained amplitude frequency information using a fourth-order Runge–Kutta method, (4) determined the suppression effect of the additional mass on the nonlinear frequency doubling phenomenon, and (5) experimentally verified the CMF. The results showed that the base coupled the vibrations of two beams, and the symmetric additional mass suppressed the nonlinear frequency doubling phenomenon, thus suppressing low or high frequencies. Also, the effect of pipeline defects simulated under asymmetric additional mass was obtained through numerical analysis and experimental data. Flowmeters with a required measuring frequency range had the optimal suppression effect on nonlinear frequency doubling and provided theoretical guidance for the nondestructive testing of measuring tubes.
Highlights
Because the exciting unit of the Coriolis mass flowmeters (CMFs) was arranged in the centre of the U tube, considering the effect of additional mass in the exciting unit, the experimental results showed that the additional mass had less effect on the nonlinear frequency doubling, but the random noise could be reduced by additional mass
In this study, based on previous theoretical derivations and actual industrial demand, the effect of symmetric and asymmetric additional masses on the nonlinear frequency doubling of a coupling system was studied by introducing additional mass into the theoretical model
The final experimental and numerical analysis results were basically consistent; that is, the nonlinear frequency doubling phenomenon can be addressed based on industrial requirements from the two perspectives of low-frequency suppression and high-frequency suppression
Summary
To trace the nonlinear phenomenon of a CMF, many studies have analyzed the fluid properties [3], fluid-structure interaction [4,5], key parameters [6], and installation ef-. To trace the nonlinear phenomenon of a CMF, many studies have analyzed the fluid properties [3], fluid-structure interaction [4,5], key parameters [6], and installation effects [7,8] of measuring tubes, nonideal boundary conditions [9,10,11], defects resulting from fects [7,8] of measuring tubes, nonideal boundary conditions [9,10,11], defects resulting from structural inhomogeneity [12,13], etc. Synchronization generally takes in or two or more coupled and nonlinear omous oscillation systems of similar size. Synchronization is a fundamental theme in linear phenomena and is a currently popular topic of research in the control field [16].
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