一种换能器频率跟踪与振幅稳定方法的研究  

Research on a Method of Frequency Tracking and Vibration Stabilization for Transducer

作　　者：屈百达[1] 韩志刚[1] 

机构地区：[1]江南大学轻工过程先进控制教育部重点实验室,江苏无锡214122

出　　处：《压电与声光》2014年第5期845-848,共4页Piezoelectrics & Acoustooptics

基　　金：高等学校学科创新引智计划基金资助项目(B12018);江苏高校优势学科建设工程基金资助项目;江苏省产学研联合创新基金资金项目(120767)

摘　　要：针对超声波换能器工作过程中换能器的谐振频率漂移及其振幅不稳定问题,对一种同时实现振幅稳定和频率跟踪的方法进行了研究。通过正交相关法对换能器匹配网络的复阻抗幅值与相位进行分析。通过比例-积分-微分(PID)控制算法对超声波发生器输出电压的频率和幅值进行调节,从而实现换能器频率的跟踪和振幅稳定。对频率28kHz的换能器进行了实验,实验表明,正交相关法和PID控制算法的结合能实现换能器的谐振频率跟踪和振幅稳定。Aiming at the problem of the resonant frequency dritt and the amphtude InStability of the transaucer during operation, a method of achieving stable amplitude and frequency tracking simultaneously is studied. The amplitude and phase of the complex impedance of the matching network is analyzed by the orthogonal correlative meth od, the frequency and amplitude of the output voltage of the ultrasonic generator is regulated by the proportional integral-differential （PID） control algorithm,then the frequency tracking and vibration stabilization is achieved. The experiment on the frequency of 28 kHz transducer is carried out and it indicates that the combination of orthogonal correlative method and PID control algorithm can achieve the frequency tracking and vibration stabilization of transducer.

关 键 词：换能器 频率跟踪 振幅稳定 正交相关方法 比例-积分-微分(PID) 

分 类 号：TM935[电气工程—电力电子与电力传动]