自由端盖Ⅲ型宽带弯张换能器的设计  

Design on broadband ClassⅢflextensional transducer with decoupling end caps

作　　者：吴光未 莫喜平[1,2] 柴勇 刘永平[1,2] WU Guangwei;MO Xiping;CHAI Yong;LIU Yongping(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;Beijing Engineering Technology Research Center of Ocean Acoustic Equipment,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院声学研究所,北京100190 [2]北京海洋声学装备工程技术研究中心,北京100190 [3]中国科学院大学,北京100049

出　　处：《声学学报》2022年第4期495-502,共8页Acta Acustica

基　　金：国家自然科学基金项目(11804367)资助。

摘　　要：提出了一种利用多模耦合实现低频、宽带、大功率特性的新结构Ⅲ型弯张换能器。通过在压电陶瓷堆内部嵌入与凹型弯张壳体相连的弹性辅助弯曲梁结构,并用弯曲圆盘作为顶部自由端盖,增加有效工作模态。利用有限元方法对换能器进行了设计优化,分析结果显示换能器在低频段存在4个主要工作模态。根据优化结果,加工制作了换能器样机,水池实验的测试结果表明:在1.5~5.5 kHz范围内,换能器样机的发送电压响应均大于135 dB;1.5~4 kHz内的最大发送电压响应大于142 dB,响应起伏小于6 dB。研究结果表明自由端盖Ⅲ型弯张换能器不仅能够在小尺寸设计下实现大功率工作,还能获得低频宽带发射性能。A new ClassⅢflextensional transducer with low frequency,broadband and high power using multimode coupling technique is proposed.By adding an elastic auxiliary flexural beam connected to a concave flextensional shell,and using a bender disk as the end cap,the more useful working modes could be used.The Finite Element Method(FEM)is used to design and analyze the transducer.The FEM results show that the transducer has four main modes in the low frequency band.A prototype of the flextensional transducer is developed,and measurement results show that the Transmitting Voltage Response(TVR)of the transducer is greater than 135 dB in the range of 1.5~5.5 kHz.The maximum transmitting voltage response is greater than 142 dB and the fluctuation of the TVR is less than 6 dB from1.5 kHz to 4 kHz.The result proves that the ClassⅢflextensional transducer with decoupling end caps could not only transmit high power in small size,but also achieve low frequency and broadband performance.

关 键 词：换能器 工作模态 有限元方法 发射性能 水池实验 端盖 压电陶瓷 尺寸设计 

分 类 号：TB51[理学—物理]