辐射头对磁致伸缩换能器输出特性的影响

The Effect of Radiation Head on the Output Features of Magnetostrictive Transducer

辐射头作为磁致伸缩换能器的最终输出部分,对其输出特性有显著影响。该文在换能器工作机理及压磁-压电比拟法的基础上,借助ANSYS工程应用软件,分析辐射头对换能器输出特性的影响。模拟结果表明,不同形状的辐射头中,长方体辐射头换能器的基振频率最低,动态位移最大;不同材料的辐射头中,45#钢辐射头的基振频率最低,动态位移最大;在非共振低频激励条件下,换能器的输出为同频正弦周期信号;在共振条件下,换能器位移变化不再是正弦波形,但其输出的瞬时位移有明显提高,能达到25μm。

The radiation head as the final output part of the magnetostrictive transducer has significant influence on the output features of the transducer.The effect of the radiation head on the output features of transducer has been analyzed based on the working mechanism of the transducer and piezomagnetic-piezoelectric analogy method with the assistance of ANSYS engineering application software.The results show that,among different types of radiation head,the cuboid radiation head transducer has the lowest vibration frequency and the most significant dynamic displacement; while among different materials of radiation head,45# steel radiation head has the lowest vibration frequency and the most significant dynamic displacement.Under non-resonant low frequency excitation condition,the output of the transducer is a same frequency sine periodical signal; while under resonance condition,the displacement of the transducer is no longer sine wave shape,but the output of its instantaneous displacement has improved significantly,which can reach 25 μm.