弛豫铁电单晶/压电陶瓷混合激励换能器EI北大核心CSCD

为了降低纵向换能器尺寸并提高发射带宽和发送电压响应,研究了一种弛豫铁电单晶/压电陶瓷混合激励换能器,换能器由011]方向极化PIN-PMN-PT单晶和PZT-4压电陶瓷混合激励,利用多模态振动耦合的原理,通过单晶的32模式振动,可以灵活调整两种振子之间的驱动能力和刚度分配。首先通过四端网络法得到了换能器等效电路并计算了其谐振频率,然后利用有限元方法对换能器进行了仿真优化,最后制作了试验样机并进行了测试分析。换能器样机外径86 mm、长度80 mm,工作频带13~38 kHz,最大发送电压响应为144.9 dB,带内发送电压响应起伏小于6 dB,具有良好的宽带、小尺寸工作性能。

Relaxor ferroelectric single crystal/piezoelectric ceramic hybrid excitation transducer

In order to reduce the size of the longitudinal transducer and increase the emission bandwidth, a relaxor ferroelectric single crystal/piezoelectric ceramic hybrid excitation transducer was studied. The transducer is polarized in the direction of 011] PIN-PMN-PT single crystal and PZT-4 piezoelectric ceramic hybrid excite, using the principle of multi-mode vibration coupling, through single crystal 32-mode vibration, can flexibly adjust the drive capacity and stiffness distribution between the two vibrators. First, the equivalent circuit of the transducer was obtained by the four-terminal network method and its resonance frequency was calculated. Then, the transducer was simulated and optimized by the finite element method. Finally, a test prototype was made and tested and analyzed. The transducer prototype has an outer diameter of 86 mm, a length of 80 mm, a working frequency band of 13~38 kHz, a maximum transmission voltage response of 144.9 dB, and an in-band transmission voltage response fluctuation of less than 6 dB. It has good broadband and small-size working performance.