Fuzzy control on automatic frequency tracking of ultrasonic vibration system with high power and high quality factor Q  

作　　者：朱武 张佳民 刘洪利 孟逢逢 张智明 

机构地区：[1]Shanghai University of Electric Power

出　　处：《Journal of Harbin Institute of Technology(New Series)》2009年第2期275-278,共4页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the Natural Science Foundation of Shanghai Education Committee(Grant No.05LZ13);Shanghai Leading Academic Discipline Project(Grant No. P1303);Shanghai Elitist Project(Grant No.04YQHB126)

摘　　要：In order to realize automatic tracking drift of resonance frequency of ultrasonic vibration system with high power and high quality factor Q, adaptive fuzzy control was studied with a self-fabricated ultrasonic plastic welding machine. At first, relations between amplitude of vibration and frequency as well as main loop current and amplitude of vibration were analyzed. From this analysis, we deduced that frequency tracking process of the vibration system can be concluded as an optimizing problem of one dimensional fluctuant extremum of main loop current in vibration system. Then a method of self-optimizing fuzzy control, used for the realization of automatic frequency tracking in vibration system, is presented on the basis of serf-optimizing adaptive control approach and fuzzy control approach. The result of experiments shows that the fuzzy self-optimizing method can solve the problem of tracking frequency drift very well. Response time of tracking in the system is less than 50 ms, which basically meets the requirements of frequency tracking in ultrasonic plastic welding machine.In order to realize automatic tracking drift of resonance frequency of ultrasonic vibration system with high power and high quality factor Q,adaptive fuzzy control was studied with a self-fabricated ultrasonic plastic welding machine.At first,relations between amplitude of vibration and frequency as well as main loop current and amplitude of vibration were analyzed.From this analysis,we deduced that frequency tracking process of the vibration system can be concluded as an optimizing problem of one dimensional fluctuant extremum of main loop current in vibration system.Then a method of self-optimizing fuzzy control,used for the realization of automatic frequency tracking in vibration system,is presented on the basis of self-optimizing adaptive control approach and fuzzy control approach.The result of experiments shows that the fuzzy self-optimizing method can solve the problem of tracking frequency drift very well.Response time of tracking in the system is less than 50 ms,which basically meets the requirements of frequency tracking in ultrasonic plastic welding machine.

关 键 词：automatic frequency tracking fuzzy control ultrasonic vibration system resonant frequency 

分 类 号：TP273.2[自动化与计算机技术—检测技术与自动化装置] TP274.2[自动化与计算机技术—控制科学与工程]