专家-模糊PID在低速风洞风速控制系统中的应用

介绍北京航空航天大学D-4低速风洞风速控制系统的结构、控制原理和性能特点.为了解决低速风洞风速控制系统建模困难、控制系统复杂、易受外界影响,且自身参数时变不确定、控制难度大的特点,采用了模糊PID调节算法结合专家判断组成专家-模糊智能控制器的方法控制风速.现场调试运行结果表明:这种方法解决了常规PID不能在线进行参数自整定的问题,不仅具有PID控制器高精度的优点,又具有模糊控制器快速性、稳定性、鲁棒性高的特点,并且具有良好的动、稳态特性,可满足低速风洞风速控制要求. 

Parameters self-tuning fuzzy-PID combined with expert control on wind velocity control system of wind tunnels at home

The structure and the characters of wind velocity control system of D-4 low velocity wind tunnel at home having been built in Beijing University of Aeronautics and Astronautics was introduced.Due to the difficulties of establishing mathematical model,the complicated nonlinear characters and the change of parameters,the wind velocity systems is not easy to control in classical PID algorithm.This problem can be solved on the basis of parameters self-tuning fuzzy-PID control algorithm combined with expert decision.The experiment proved,compared with classical PID control,the parameters self-tuning fuzzy-PID control method can decrease the overshoot,enhance the capacity of anti-dynamic disturbance,have certain robustness,resolve the contradictory between rapidity and small overshoot,and is suitable for application in low velocity wind control system.