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Rongzhen Guo
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China

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Communication
Published: 23 February 2021 in Sensors
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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.

ACS Style

Jiuling Hu; Lianjin Hong; Lili Yin; Yu Lan; Hao Sun; Rongzhen Guo. Research and Fabrication of Broadband Ring Flextensional Underwater Transducer. Sensors 2021, 21, 1548 .

AMA Style

Jiuling Hu, Lianjin Hong, Lili Yin, Yu Lan, Hao Sun, Rongzhen Guo. Research and Fabrication of Broadband Ring Flextensional Underwater Transducer. Sensors. 2021; 21 (4):1548.

Chicago/Turabian Style

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

Journal article
Published: 19 July 2019 in Sensors
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This paper realizes an underwater spiral wave sound source by using three omni-directional spherical transducers with three different phases. The pressure distribution of the sound field for a phased array is derived using the superposition theory of sound field. The generation of spiral wave field is presented, the relationship between the performance of phased array sound field and the array parameters is analyzed, and also verified by the finite element method (FEM). A spiral wave sound source with three spherical piezoelectric ceramic transducers is then designed and fabricated based on FEM simulation, and the performance of the sound source is analyzed. Measurements are made in a reverberation pool, and the result shows that the fabricated spiral wave sound source is capable of producing a spiral sound wave. Under a frequency of 3.5 kHz, the phase directivity has a fluctuation of ±21°, and the amplitude directivity range is 4.3 dB, which verifies the realization of the spiral wave sound source.

ACS Style

Wei Lu; Rongzhen Guo; Yu Lan; Hao Sun; Shichang Li; Tianfang Zhou; Lu; Guo; Lan; Sun; Li; Zhou. Underwater Spiral Wave Sound Source Based on Phased Array with Three Transducers. Sensors 2019, 19, 3192 .

AMA Style

Wei Lu, Rongzhen Guo, Yu Lan, Hao Sun, Shichang Li, Tianfang Zhou, Lu, Guo, Lan, Sun, Li, Zhou. Underwater Spiral Wave Sound Source Based on Phased Array with Three Transducers. Sensors. 2019; 19 (14):3192.

Chicago/Turabian Style

Wei Lu; Rongzhen Guo; Yu Lan; Hao Sun; Shichang Li; Tianfang Zhou; Lu; Guo; Lan; Sun; Li; Zhou. 2019. "Underwater Spiral Wave Sound Source Based on Phased Array with Three Transducers." Sensors 19, no. 14: 3192.

Journal article
Published: 29 October 2018 in Sensors
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A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite element modeling (FEM)of the transducer was established for simulating the vibration modes and the acoustic characteristics of the transducers. Further, we fabricated a spiral sound wave transducer based on our design and simulations. It was found that the resonance frequency of the transducer was 10.8 kHz and that the transmitting voltage resonance was 140.5 dB. The underwater sound field measurements demonstrate that our designed transducer based on the longitudinal elements could successfully generate spiral sound waves.

ACS Style

Wei Lu; Yu Lan; Rongzhen Guo; Qicheng Zhang; Shichang Li; Tianfang Zhou. Spiral Sound Wave Transducer Based on the Longitudinal Vibration. Sensors 2018, 18, 3674 .

AMA Style

Wei Lu, Yu Lan, Rongzhen Guo, Qicheng Zhang, Shichang Li, Tianfang Zhou. Spiral Sound Wave Transducer Based on the Longitudinal Vibration. Sensors. 2018; 18 (11):3674.

Chicago/Turabian Style

Wei Lu; Yu Lan; Rongzhen Guo; Qicheng Zhang; Shichang Li; Tianfang Zhou. 2018. "Spiral Sound Wave Transducer Based on the Longitudinal Vibration." Sensors 18, no. 11: 3674.