文档介绍：科氏质量流量管非线性幅值控制方法研究*
李祥刚1 徐科军1,2
(1. 合肥工业大学自动化研究所, 合肥 230009; 2. 工业自动化安徽省工程技术研究中心, 合肥 230009)
摘要: 在批料流和两相流发生的过程中, 流量管的阻尼比迅速增大, 模拟驱动的科里奥利质量流量计由于有限的驱动增益和简单的增益控制算法无法维持流量管的稳幅振动。针对这种情况, 建立科里奥利质量流量计激振系统的时变参数模型, 研究数字驱动中的非线性幅值控制算法, 并提出改进方案。根据牛津大学对两相流进行实验得到的数据, 确定在两相流发生过程中阻尼比变化的规律, 使用Simulink进行仿真, 验证改进的非线性幅值控制算法。
关键词: 科里奥利质量流量计;时变参数模型;非线性幅值控制;批料流;仿真
中图分类号: TB937 文献标识码: A 国家标准学科分类代码:
Research on non-linear amplitude control method of coriolis mass flow-tube
Li Xianggang1 Xu Kejun1,2
(1. Institute of Automation, Hefei University of Technology, Hefei 230009, China;
2 .Engineering Technology Research Center of Industrial Automation, Hefei 230009, China)
Abstract: In the process of batching from empty and two-phase flow, the damping ratio of flow-tube increases quickly, so the analogue driving Coriolis mass flowmeter cannot maintain the fixed amplitude vibration of flow-tube because of the limitation of drive gain and the simple gain control algorithm. In order to solve the problem, a time-varying parameter model of exciting vibration system of Coriolis mass-flow meter is built, the non-linear amplitude control algorithm used in digital driving is researched, and an improved version is proposed in the paper. According to two-phase flow experimental data from Oxford University, the damping change pattern is deduced to reflect the process of two-phase flow, and Simulink is use