环/柱结构磁电复合振子的磁控谐振频率偏移  

Magnetically Tunable Resonance Shift of Ring/Column Magnetoelectric Composite Vibrator

作　　者：高蓉[1] 罗小彬[1] 王巍[1,2] 

机构地区：[1]南京师范大学物理科学与技术学院,江苏南京210023 [2]南京大学近代声学教育部重点实验室,江苏南京210093

出　　处：《南京师大学报（自然科学版）》2017年第4期57-63,共7页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：江苏省高校自然科学基金(15KJD430007);南京师范大学国家自然科学基金预研项目(XYY2015015)

摘　　要：从磁电耦合的角度,探讨磁场对环/柱结构压电/磁致伸缩复合振子谐振频率的调控作用.利用磁致伸缩Tb_xDy_(1-x)Fe_(2-y)(TDF)和压电材料Pb(Zr,Ti)O_3(PZT)构成的环柱磁电复合结构,分别从理论和实验两方面研究了磁场对复合振子谐振频率的影响.从压电相和磁致伸缩材相的本构方程出发,理论推导了压电相电容与磁场、谐振频率和材料参数的函数关系,数值模拟了环/柱状磁电复合振子的基频和一级谐振频率随磁场的变化;实验研究了环/柱状复合振子的谐振频率随磁场的偏移规律,即复合振子的基频和一级谐振频率都随磁场的增加先向高频偏移然后又转向低频方向偏移.当磁场为200 Oe时,谐振频率偏移量达到最大值,分别为9.50 kHz和3.50 kHz;数值模拟谐振频率偏移量与实验基本吻合.In consideration of magnetoelectric coupling effect,magnetically tunable electromechanical resonance with a dc bias magnetic field is proposed. Using PZT（Pb（Zr,Ti）O3） ring/TDF（TbxDy1-xFe2-y） column magnetoelectric composite vibrator,magnetically tunable resonance shift are theoretically studied and experimentally measured,respectively. Constitutive equations of piezoelectric and magnetostrictive phase are employed to describe the electric elastic and magnetic elastic coupling,and piezoelectric phase capacitance is a function of magnetic field,resonance frequency and material parameters. Frequency dependent capacitances of the PZT ring/TDF column composite vibrator are numerically simulated under different magnetic field intensities. The resonance frequency shift rule of the composite vibrator was experimental studied. With magnetic field increasing,the fundamental frequency and primary resonance frequency of the composite vibrator increase to high frequencies and then to low frequencies,the resonance shift reaches maximum under H=200 Oe,the resonance frequency offsets are 9.50 kHz and 3.50 kHz,respectively. Numerical simulation of the resonant frequency offset curve is consistent with the experimental results.

关 键 词：磁电耦合效应 环柱磁电复合结构 谐振频率 本构方程 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]