Dynamic NumericalAnalysis And Structural Optimization Of Coriolis Mass Flowmeter

Coriolis mass flowmeter (CMF) is used to measure the mass flow meterof the fluid directly by measuring the Coriolis Effect of the vibratingliquid-filled pipes. It has many advantages such as high accuracy, lesssusceptible to temperature, density, flow state, and also has a wide range ofmeasurable compared with other flowmeter.In order to improve the measuring accuracy of the CMF and save cost,numerical analysis is particularly important. A variety of factors affectcoupling frequency and measuring accuracy are analysised by thefluid-structure interaction numerical analysis method. The results haveguiding significance for its structural optimization.The main works are given as follows:(1) Development of fluid-structure interaction numerical analysismethod of CMFThis paper describes the method of fluid-structure interaction numericalanalysis by ADINA. Taking the Coriolis mass flowmeter with a straighttube for example, the phase difference between the sensing points S1andS2under different velocities is calculated. The results are good agreementwith the literature data, and this verified the correctness of the numericalanalysis method.(2) Coupling modal and vibration analysis for double U-CMFThe coupling modal analysis and vibration analysis of the U-CMF isstudied using the numerical methods, and the influence of the additionalmass of exciter and signal sensor, the thickness and location of thedamping plate and other factors on modal and phase difference arediscussed. Fine-tuning device can be designed according the trend of frequency and phase difference under different factors, which caneffectively avoid the interference of the low-frequency vibration in theindustrial field and improve the measurement accuracy of the CMF.(3) Vibration analysis of the double U-CMF measurement tubeThe vibration analysis of the measuring tube is studied, and theinfluence of damping, amplitude of excitation force and excitationfrequency is discussed. The results show that the effect of exciting force onamplitude ratio can be ignored, and the resonance frequency decreaseswith the increase of the damping ratio.(4) Structural optimization of the diamond-shaped CMFFinally, the main parameters of the measuring tube shape for thediamond-shaped CMF are discussed. The results show that the measuringtube with flat shape has larger rotational inertia, and the measurementaccuracy is also high. The results have important significance for structuraloptimization of the diamond-shaped CMF.