论文部分内容阅读
提出了一种针对层合磁电换能结构的谐振频率控制方法。该层合结构由片状压电陶瓷和超磁致伸缩材料复合而成。利用逆压电效应，通过调节压电驱动层的直流电压调整磁电层合结构的预应变，实现对谐振频率的控制。测试和分析了层合结构的谐振频率、磁电电压系数以及两者与压电驱动层的直流电压之间的关系。实验表明：1）偏置磁场一定，在压电驱动层极化方向施加-170V～170V的直流电压时，层合结构谐振磁电电压系数变化不大，其一阶纵振频率的可控幅度达1KHz；2）直流电压与谐振频率之间近似为线性关系；3）偏置磁场为0Oe～225Oes时，直流电压对一阶纵振的控制幅度不受偏置磁场大小的影响。?“,”A new method to control the resonance frequency of magnetoelectric laminated composite is presented. It is compounded by piezoelectric ceramic and giant magnetostrictive material. Based on the inverse piezoelectric effect, we could control the pre-strain and resonance frequency of magnetoelectric laminated composite by changing the DC voltage (VDC) of a piezoelectric actuator layer in laminated composite. Resonance frequency 、ME voltage coefficient and their relationship with the VDC have been calculated and analyzed. The results show that: (i) if the magnitude of VDC is in -170V~170V, the control range of resonance frequency is 1KHz and changes of ME voltage coefficient could be neglected. (ii) There is a linear relationship between resonance frequency and VDC. (iii) The control range of resonance frequency doesn’t vary with the bias magnetic field(Hbias) when Hbias is equal to 0Oe~225Oe.