基于模糊PI控制的超声波换能器谐振频率跟踪系统仿真  

Ultrasonic Transducer Resonant Frequency Tracking System Simulation Based on Fuzzy PI Control

作　　者：廖晓辉[1] 王晓伟[1] 

机构地区：[1]郑州大学电气工程学院,郑州450002

出　　处：《河南科学》2015年第3期411-415,共5页Henan Science

基　　金：河南省科技攻关项目(132102210403);郑州大学创新创业训练计划资助项目(201310459043)

摘　　要：对于超声波换能器谐振系统,利用传统谐振频率跟踪方法动态性能不甚理想,故而采用模糊控制与PI控制相结合的模糊PI控制方法.首先对超声波发生器系统进行建模,再由模糊规则表、模糊化、反模糊化以及在线仿真整定,确定PI控制器参数,最后以相位差作为模糊PI控制器的输入量,进而得到新的驱动频率控制量,新的驱动频率信号驱动逆变器得到换能器此时所需要的控制频率,即换能器谐振频率.计算机仿真结果表明,模糊PI控制方法使整个系统具有更好的动态和静态性能,能有效地使换能器工作在谐振频率.For the resonant system of ultrasonic transducers, the dynamic performance is not ideal by using the traditional tracking method of resonant frequency, so the fuzzy PI control method which combines fuzzy control and PI control is used. First, by modeling the ultrasonic generator system, and then by the fuzzy rules, fuzzy defuzzification and online simulation setting, the parameters of PI controller are determined. The phase difference is as the input of fuzzy PI controller, and the driving frequency control amount is gotten. New driving frequency signal drives inverter to produce need control frequency of the transducer, namely the transducer resonance frequency. The computer simulation results show that the static and dynamic characteristics of the system are better. The fuzzy PI control method can effectively make the transducer work in the resonant frequency.

关 键 词：超声波发生器系统 谐振频率跟踪 模糊PI控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]