基于特性图分析的科氏质量流量计模拟驱动研究

Research on Analog Drive of Coriolis Mass Flowmeter Based on Characteristic Graph Analysis

针对模拟驱动流量管易停振、启振慢等问题,利用特性图法,分析了经典模拟驱动的驱动特性,并对两种典型的模拟驱动改进方法进行了研究,提出一种改进的差分驱动。研制4种模拟驱动的实现电路,进行了气液两相流驱动实验和启振实验。实验结果表明,新型模拟驱动的驱动信号幅值更稳定,启振更快;差分驱动显著提高了驱动能量;与经典模拟驱动相比,改进的差分驱动的驱动信号和传感器信号幅值分别提高了4.2倍、3.8倍,驱动信号幅值的标准差仅为0.08,启振时间减少至2.3 s。

Aiming at the problems of easy-to-stop vibration and slow start-up of analog drive flow tube,the characteristic simulation method is used to analyze the drive characteristics of classical analog drive,and two typical analog drive improvement methods are studied.An improved differential drive is proposed.Four kinds of analog drive implementation circuits are developed,and gas-liquid two-phase flow drive experiments and vibration experiments are carried out.The experimental results show that the differential drive significantly increases the driving energy;the driving signal of the new analog driving is more stable and the start-up is faster;Compared with the classical analog drive,the amplitude of drive signal and sensor signal of the improved differential drive are increased by 4.2 times and 3.8 times,the standard deviation of the drive signal amplitude is only 0.08,and the start-up time is reduced to 2.3 s.