Numerical analysis and test of vibration and interference characteristics of dual U-tube Coriolis flowmeter

Abstract

The Coriolis flowmeter is a resonant instrument that can be easily affected by environmental vibration interference factors. Therefore, it is necessary to study the vibration characteristics of the Coriolis flowmeter, as well as the on-site environmental interference vibrations. In this paper, a full-scale numerical model of the flowmeter, including the support pipe and flange, was established, and the vibration characteristics of the Dual U-Tube Coriolis flowmeter were analyzed using structural dynamics and fluid-structure coupling calculation methods. The first to sixth natural frequencies and vibration modes were obtained. A mass flowmeter of the same model was selected from the oil transportation station, and vibration analysis and testing were carried out on the Dual U-Tube Coriolis flowmeter. The driving frequency of the Coriolis mass flowmeter and the frequency of external interference vibration signals during the distribution process were obtained through Fast Fourier transform, which verified the correctness of the numerical calculation model. It was found that the natural frequency of the Coriolis flowmeter varies with the installation conditions, and it was pointed out that external vibration signals can interfere with the operation of the Coriolis flowmeter during field operations. This work in this paper has significant reference value for the actual field installation and noise reduction of the Coriolis mass flowmeter.