高频磁致伸缩换能器谐振频率特性分析与控制

本文研究了工作温度和负载变化对换能器谐振频率的影响规律并设计了反馈控制系统以实现谐振频率跟踪.首先基于磁致伸缩换能器机电等效电路,推导了以工作温度T和负载F为自变量的谐振频率计算模型,搭建了温度可控、负载可调的谐振频率测试系统;然后对实验测试数据进行分段线性拟合和曲面数值拟合,得到了满足线性相关度和曲面拟合优度要求的谐...

Analysis and control of resonance frequency characteristics ofhigh-frequency magnetostrictive transducers

This paper studies the influence rule of operating temperature and load changes on the resonant frequency of the transducer anda feedback control system is designed to realize the resonant frequency tracking. Firstly, the resonant frequency calculation model withoperating temperature T and load F as independent variables is derived based on the electromechanical equivalent circuit of themagnetostrictive transducer, a temperature-controllable and load-adjustable resonant frequency test system is built; then, the methods ofsegmental linear fitting and surface numerical fitting are performed experiment on the tested data, and a binary function model of resonantfrequency with respect to the temperature and load variables is obtained to meet the requirements of linear correlation and surface fittinggoodness, and the relevant parameters of the resonant frequency calculation model are determined. Finally, based on the caculationmodel, a frequency tracking feedback control system reflecting temperature and load changes was designed and the output characteristicsof the transducer were tested. The results show that the vibration acceleration amplitude of the transducer is increased by about 31. 11%in average, and the resonant frequency could be automatically adjusted according to the temperature and load changes to achieve highefficiency and stable operation.