科氏流量计驱动系统模糊PID控制器设计及仿真

Design and Simulation of Fuzzy-PID Controller for Driving System of Coriolis Mass Flowmeter

针对科氏流量计驱动系统具有非线性和时变性的特点,为改善对测量管振动的控制,采用模糊PID控制策略设计了驱动增益模糊PID控制器,并利用MATLAB中的Fuzzy Logic Toolbox和Simulink工具建立了驱动系统仿真模型,分别采用常规PID控制和模糊PID控制进行了仿真试验和比较,结果表明模糊PID控制提高了系统的起振性能和追踪测量管振幅变化的能力,具有较好的综合控制性能。

For the characteristics of nonlinear and time-vary, a fuzzy-PID control method was presented in the driving system of Coriolis mass flowmeter. A Fuzzy-PID controller for driving gain control was designed, and a simulated model was set up by Fuzzy Tool box and Simulink of the MATLAB. A simple PID controller and a Fuzzy-PID controller were applied and compared re- spectively in the model. The results show that the performance of the measuring tube in the outset of oscillation and the tracing a- bility of the variation of the measuring tube＇s amplitude can be improved by the Fuzzy-PID control, and better integrated perform- ance of automatic gain control of the driving system can be acquired.