基于模拟电路方法的科氏质量流量传感器特性研究

提出了一种基于等效电路研究科氏质量流量传感器结构优化、动态响应的新方法.首先,基于测量管微元的力学平衡关系,构建了科氏质量流量传感器时域振动的数学模型.其次,基于振动模型构建了科氏质量流量传感器等效电路模型,并验证了等效电路的可行性.最后,通过研究等效电路,实现了科氏质量流量传感器在不同参数结构下振动响应的输出信号的获取,并得出科氏质量流量传感器灵敏度和固有频率随测量管长度L变化呈非线性反相关的结论,为科氏质量流量传感器的结构优化提供了新方法、新思路.

A Method to simulate the vibrating characters of the Coriolis Mass Flowmeter based on equivalent circuit

This paper proposes a study method of Coriolis mass flowmeter (CMF) based on the circuit in order to solve the problems such as CMF structure optimization. Firstly, basing on Euler-Bernoulli beam theory, the vibration equation of resonant beam is derived, and the parameter excitation characteristic equation of the CMF is established. Then, the analog circuit is established innovatively to substitute the characteristic equation of the CMF under ideal and damping states. Because the analog circuit is equivalent to the vibration equation, we can study the CMF by changing the structure and the parameter of the equivalent circuit to obtain the output waveform for further study. Finally, this paper provide a model of the circuit with typical parameters. By studying this model, we verify the feasibility and the accuracy of the CMF equivalent equation.