1-1-3型压电复合材料宽带换能器

Research on 1-1-3 piezocomposite broad-band transducers

1-3型压电复合材料换能器带宽的拓展一般采用匹配层的方法,但匹配层的特性会随着时间的变化而变化,这会造成换能器性能的不稳定.将单端激励的原理引入1-3型压电复合材料,提出了一种新的压电复合材料结构,即1-1-3型压电复合材料.应用ANSYS软件建立1-1-3型压电复合材料换能器的有限元模型,然后进行结构优化,最终制作了一个利用一阶、二阶和三阶厚度振动模态的1-1-3型压电复合材料宽带换能器,其工作带宽为112 kHz～450 kHz,发送电压响应最大值为174 dB.研究结果表明:利用1-1-3型压电复合材料的一阶、二阶和三阶厚度振动模态可以拓展压电复合材料换能器的带宽,同时也给出了一种高频换能器实现宽带发射的方法.

The matching layer is commonly used to expand the bandwidth of 1-3 piezocomposite transducers.But as time passes,the performance of matching layers will change,this change may cause performance instability of the transducer.By applying the concept of single-ended excitation to 1-3 piezocomposite material,a new piezocomposite structure,that is 1-1-3 piezocomposite material,was achieved.The finite element model of a 1-1-3 piezocomposite transducer was set up with ANSYS software and the structure of the transducer was optimized.A final 1-1-3 piezocomposite transducer was designed which used the first,second,and third thickness modes.The bandwidth of the transducer was 112-450kHz,in which the peak transmitting voltage response was 174dB.Several conclusions can be reached from the research： The bandwidth of piezocomposite transducers can be expanded by the first,second,and third thickness modes.Also,a method was given to achieve the broad-band projection performance of a high-frequency transducer.