科氏质量流量计振幅对零点影响  

Influence of Coriolis Mass Flowmeter Amplitude on Zero Point

作　　者：黄雅 徐科军[1,2] 刘陈慈 HUANG Ya;XU Ke-jun;LIU Chen-ci(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei,Anhui,230009,China;Engineering Technology Research Center of Industrial Automation,Anhui Province,Hefei,Anhui,230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]工业自动化安徽省工程技术研究中心,安徽合肥230009

出　　处：《计量学报》2023年第2期211-218,共8页Acta Metrologica Sinica

摘　　要：针对科里奥利质量流量计振幅改变引起零点漂移的问题,首先通过简化模型建立流量管的弯曲振动方程,求解两检测点的位移响应,得到零点相位差与振幅之间的线性关系;然后采集不同振幅下的传感器放大信号,编写过零检测算法,计算零点相位差,建立零点与振幅之间关系的直线,实验验证零点与振幅的线性关系;最后结合检定规程和零点计算结果,定性和定量地分析振幅改变引入的零点漂移导致的测量误差,结果表明,振幅改变越大,引入的测量误差越大,当流量为10 kg/min时,振幅改变10 mV引入的测量误差达0.727%。Aiming at the problem of the zero drift caused by the change of the Coriolis mass flowmeter amplitude,the flexural vibration equation of the flow tube is first established by simplifying the model,the displacement response of the two detection points is solved,and the linear relationship between the zero phase difference and the amplitude is obtained;Then,the amplified signals of the sensors under different amplitudes are collected,a zero-crossing detection algorithm to calculate the zero-point phase difference is written,a straight line between the zero point and the amplitude is established,and the linear relationship between the zero point and the amplitude through experiments is verified;Finally,combined the verification procedures and the zero point calculation results,the measurement error introduced the zero point drift caused by the amplitude change is analyzed qualitatively and quantitatively,the results show that the greater the amplitude change,the greater the measurement error introduced,when the flow rate is 10 kg/min,the amplitude change 10 mV introduces a measurement error of 0.727%.

关 键 词：计量学 科氏质量流量计 振幅 零点漂移 误差 

分 类 号：TB937[一般工业技术—计量学]