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Open AccessCommunication

Research and Fabrication of Broadband Ring Flextensional Underwater Transducer

by 1,2,3,4, 1,2,3, 1,2,3,4, 1,2,3,*, 1,2,3 and 1,2,3
1
Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China
2
Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University), Ministry of Industry and Information Technology, Harbin 150001, China
3
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
4
Shenyang LiaoHai Equipment CO., LTD., Shenyang 110000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Sensors 2021, 21(4), 1548; https://doi.org/10.3390/s21041548
Received: 31 January 2021 / Revised: 9 February 2021 / Accepted: 19 February 2021 / Published: 23 February 2021
(This article belongs to the Special Issue Underwater Acoustic Sensors and Applications)
At present, high-speed underwater acoustic communication requires underwater transducers with the characteristics of low frequency and broadband. The low-frequency transducers also are expected to be low-frequency directional for realization of point-to-point communication. In order to achieve the above targets, this paper proposes a new type of flextensional transducer which is constructed of double mosaic piezoelectric ceramic rings and spherical cap metal shells. The transducer realizes broadband transmission by means of the coupling between radial vibration of the piezoelectric rings and high-order flexural vibration of the spherical cap metal shells. The low-frequency directional transmission of the transducer is realized by using excitation signals with different amplitude and phase on two mosaic piezoelectric rings. The relationship between transmitting voltage response (TVR), resonance frequency and structural parameters of the transducer is analyzed by finite element software COMSOL. The broadband performance of the transducer is also optimized. On this basis, the low-frequency directivity of the transducer is further analyzed and the ratio of the excitation signals of the two piezoelectric rings is obtained. Finally, a prototype of the broadband ring flextensional underwater transducer is fabricated according to the results of simulation. The electroacoustic performance of the transducer is tested in an anechoic water tank. Experimental results show that the maximum TVR of the transducer is 147.2 dB and the operation bandwidth is 1.5–4 kHz, which means that the transducer has good low-frequency, broadband transmission capability. Meanwhile, cardioid directivity is obtained at 1.4 kHz and low-frequency directivity is realized. View Full-Text
Keywords: low frequency; broadband; flextensional transducer; flexural vibration; finite element low frequency; broadband; flextensional transducer; flexural vibration; finite element
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MDPI and ACS Style

Hu, J.; Hong, L.; Yin, L.; Lan, Y.; Sun, H.; Guo, R. Research and Fabrication of Broadband Ring Flextensional Underwater Transducer. Sensors 2021, 21, 1548. https://doi.org/10.3390/s21041548

AMA Style

Hu J, Hong L, Yin L, Lan Y, Sun H, Guo R. Research and Fabrication of Broadband Ring Flextensional Underwater Transducer. Sensors. 2021; 21(4):1548. https://doi.org/10.3390/s21041548

Chicago/Turabian Style

Hu, Jiuling; Hong, Lianjin; Yin, Lili; Lan, Yu; Sun, Hao; Guo, Rongzhen. 2021. "Research and Fabrication of Broadband Ring Flextensional Underwater Transducer" Sensors 21, no. 4: 1548. https://doi.org/10.3390/s21041548

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