摘要
科里奥利质量流量计由一次仪表和二次仪表组成。为使二次仪表更好地控制流量管振动幅值,需知道流量管振动系统的数学模型。采用机理分析与实验研究相结合的方法,建立流量管振动系统的数学模型。首先通过机理分析,构建流量管振动系统的二阶模型框架;再采用有限长度的正弦波激励流量管,根据速度传感器输出的自由衰减振荡信号、稳态下的激励信号幅值和输出信号幅值确定模型参数。建立单相流工况和气液两相流工况下的流量管振动系统数学模型,分析模型的差异,为流量管振动幅值的控制奠定基础。
The Coriolis mass flowmeter consists of a primary instrument and a secondary instrument. To make the secondary instrument has a better control of the vibration amplitude of flow tube,it is needed to know the mathematical model of the flow tube vibration system( FTVS). In this paper,the mathematical model of FTVS is established by means of mechanism analysis combined with experimental research. Firstly,the second-order model framework of FTVS is constructed through mechanism analysis. Then the finite length sine wave is used to stimulate the flow tube,and the model parameters are determined according to the free attenuation oscillation signal,the steady-state input signal amplitude,and the output signal amplitude. The mathematical model of FTVS under the single-phase flow and the gas-liquid two-phase flow conditions are built,and the differences of the models are analyzed,which lays the foundation for the control of the flow tube vibration amplitude.
出处
《电子测量与仪器学报》
CSCD
北大核心
2018年第6期39-45,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(61573124)资助项目
关键词
科氏质量流量计
流量管振动系统
数学模型
幅值控制
实验
Coriolis mass flowmeter
flow tube vibration system
mathematical model
amplitude control
experiment
