磁致伸缩铁氧体材料的声学磁力谐振效应研究

Acoustic magnetic resonance effect of magnetostrictive ferrite materials

部分铁氧体材料凭借其优良的磁致伸缩效应,能有效地将电磁能转化为机械能和声能。针对这一现象,首先建立了磁力谐振力学模型,预测了磁声共振现象的特征。其次利用铁氧体棒磁声实验装置定量研究了镍锌和锰锌铁氧体棒在交流磁场信号下的磁致伸缩现象,基于前人的实验成果进一步采集了不同频率下的磁声信号,结合前文Jiles-Atherton磁滞模型系统研究了交流磁场频率、铁氧体棒的长度、材料类型、线圈电压等实验变量对铁氧体棒磁声共振现象的影响。研究结果表明理论模型与实验结果符合较好。目前强磁场下的磁性测量还有待进一步发展和完善,希望可以通过利用J-A磁滞与铁氧体磁致伸缩效应的结合给出新的思路。

Some ferrite materials can effectively transform electromagnetic energy into mechanical energy and sound energy by virtue of their excellent magnetostrictive effect.Aiming at this phenomenon,a magnetic resonance mechanics model is established to predict the characteristics of magnetoacoustic resonance.Secondly,the magnetostrictive phenomena of ni-Zn and Mn-Zn ferrite rods under AC magnetic field signals were quantitatively studied by using ferrite rod acoustic experimental device.Based on previous experimental results,magneto-acoustic signals at different frequencies were further collected.Combined with the Jiles-Atherton hysteresis model mentioned above,the effects of experimental variables such as ac magnetic field frequency,ferrite rod length,material type and coil voltage on the magneto-acoustic resonance of ferrite rods are studied.The results show that the theoretical model is in good agreement with the experimental results.At present,magnetic measurement under strong magnetic field needs to be further developed and improved.It is hoped that A new idea can be given by combining J-A hysteresis with ferrite magnetostriction effect.