一种高精度科氏流量计数模混合驱动系统的研究与设计

Digital and Analog Mixed Differential Drive System in Coriolis Mass Flowmeter

驱动系统是科氏流量计的关键组成部分。模拟驱动系统可以实现频率无偏跟踪,但不易控制,起振时间也比较长,在复杂的情况下还容易停振。数字驱动系统虽然控制灵活,起振快,但频率跟踪精度会受到一定限制。为解决上述问题,本团队经过充分理论分析、模拟仿真、精心设计出了一种高精度的科氏流量计数模混合驱动系统。经多次反复试验、验证,证明该系统具有模拟驱动系统和数字驱动系统的主要优点,跟踪精度和测量精度都得到了很大提高,达到了预期设计目标,同时该系统适应性更强,易于推广应用。

The driving system is the key of Coriolis mass flowmeter(CMF). Analog driver system tracking frequency is accurate, but it’s amplitude control is simple, the vibration start time is long, and easy to stop vibration in complex situations. Digital driver system has flexible control and rapid vibration, but it limits the measurement accuracy of the system. As a result, a test system based on digital and analog mixed differential drive is designed. The test shows that the system has the advantages of vibration stability, high measurement accuracy and easy to apply.