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Yu Lan
Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China

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Research article
Published: 14 August 2021 in Journal of Applied Physics
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In the process of multiplexing acoustic orbital angular momentum to realize underwater acoustic communication, the demodulation process is always affected by the larger divergence angle of higher-order acoustic vortex beams. To restrain the influences of this problem, proposed here are discrete active helical arrays with different heights and radii to generate topologically diverse underwater acoustic vortex beams, and the reasons for the different divergence angles of acoustic vortex beams with different orders are analyzed. In finite-element analysis and experiments, the same divergence angle of acoustic vortex beams with different orders is obtained, and an effective method is provided for emitting underwater acoustic vortex beams. The proposed design has potential applications in underwater acoustic communication.

ACS Style

Wei Lu; Hao Sun; Yu Lan; Rongzhen Guo. Generation of topologically diverse acoustic vortex beams with same divergence angle using discrete active helical arrays. Journal of Applied Physics 2021, 130, 064501 .

AMA Style

Wei Lu, Hao Sun, Yu Lan, Rongzhen Guo. Generation of topologically diverse acoustic vortex beams with same divergence angle using discrete active helical arrays. Journal of Applied Physics. 2021; 130 (6):064501.

Chicago/Turabian Style

Wei Lu; Hao Sun; Yu Lan; Rongzhen Guo. 2021. "Generation of topologically diverse acoustic vortex beams with same divergence angle using discrete active helical arrays." Journal of Applied Physics 130, no. 6: 064501.

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: 01 December 2019 in AIP Advances
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ACS Style

Bocheng Ji; Chunying Wang; Lianjin Hong; Yongjie Sang; Yu Lan. Aspect ratio dependence of the effective electromechanical coupling coefficient Ke of the transverse vibration mode for a piezoelectric rectangular thin plate. AIP Advances 2019, 9, 125338 .

AMA Style

Bocheng Ji, Chunying Wang, Lianjin Hong, Yongjie Sang, Yu Lan. Aspect ratio dependence of the effective electromechanical coupling coefficient Ke of the transverse vibration mode for a piezoelectric rectangular thin plate. AIP Advances. 2019; 9 (12):125338.

Chicago/Turabian Style

Bocheng Ji; Chunying Wang; Lianjin Hong; Yongjie Sang; Yu Lan. 2019. "Aspect ratio dependence of the effective electromechanical coupling coefficient Ke of the transverse vibration mode for a piezoelectric rectangular thin plate." AIP Advances 9, no. 12: 125338.

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: 13 May 2019 in Wave Motion
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This paper introduces a model for the propagation of multiple types of waves in a compressed granular chain placed on an elastic V-shaped rail. The system possesses translational, rotational, and torsional degrees of freedom, and the different waves interact due to the presence of Hertzian contacts between adjacent spheres and between the spheres and the rail. Additional tangential force and torque between the spheres and the rail governed by the Hertz–Deresiewicz law are accounted for. This allows an exclusive tuning of the shear and torsional stiffness coefficients and leads to a complex coupled wave dynamics. Tunable dispersion relations including zero group velocity mode, accidental degeneracy and mode hybridisation are investigated in the linear regime. It is shown that the tangential force-dependent shear stiffness between the spheres and the rail strongly influences the dispersion relations, while the influence of the torque-dependent torsional stiffness is much weaker. The inclination angle of the rail is examined as another tunable degree of freedom, which modifies the wave dispersion not only by changing the shear coupling but also by influencing the coupling among different types of waves. The tunability of the wave dynamics in the granular chain evidenced in this work offers a flexible way of designing acoustic systems for selective vibration filtering and wave manipulation.

ACS Style

Qicheng Zhang; Rodolfo Venegas; Olga Umnova; Yu Lan. Tuning coupled wave dispersion in a granular chain on a V-shaped rail. Wave Motion 2019, 90, 51 -65.

AMA Style

Qicheng Zhang, Rodolfo Venegas, Olga Umnova, Yu Lan. Tuning coupled wave dispersion in a granular chain on a V-shaped rail. Wave Motion. 2019; 90 ():51-65.

Chicago/Turabian Style

Qicheng Zhang; Rodolfo Venegas; Olga Umnova; Yu Lan. 2019. "Tuning coupled wave dispersion in a granular chain on a V-shaped rail." Wave Motion 90, no. : 51-65.

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.

Journal article
Published: 30 June 2018 in Sensors
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Class IV Flextensional Transducers (FTs) are the most popular among various FTs used as low-frequency and high power underwater acoustic sources. However, an undeniable fact exists in Class IV FTs is that the resonance frequency of breathing mode regulator used is fairly raised by its longitudinal driver stacks. In this research, a conformal driving Class IV FT in which the driver stacks are kept conformal with its oval shell was proposed aiming at the limitations of conventional driving Class IV FTs described above. The device exhibits competitive Transmitting Voltage Responses (TVRs) but much lower operation frequencies with respect to conventional driving Class IV FTs, through the designs of conformal and segmentally controlled driver stacks. Geometric parameters analysis was carried out extensively by Finite Element (FE) simulations for the design optimizations and then a conformal driving Class IV FT resonating at 510 Hz (45% approximately lower than that of conventional driving Class IV FT with the same shell geometry) was finalized. Subsequently the conformal driving Class IV was fabricated and tested in the anechoic tank experimentally. Good agreements of both FE predictions and experimental results demonstrate its low-frequency and small-size acoustic performance.

ACS Style

Tianfang Zhou; Yu Lan; Qicheng Zhang; Jingwen Yuan; Shichang Li; Wei Lu. A Conformal Driving Class IV Flextensional Transducer. Sensors 2018, 18, 2102 .

AMA Style

Tianfang Zhou, Yu Lan, Qicheng Zhang, Jingwen Yuan, Shichang Li, Wei Lu. A Conformal Driving Class IV Flextensional Transducer. Sensors. 2018; 18 (7):2102.

Chicago/Turabian Style

Tianfang Zhou; Yu Lan; Qicheng Zhang; Jingwen Yuan; Shichang Li; Wei Lu. 2018. "A Conformal Driving Class IV Flextensional Transducer." Sensors 18, no. 7: 2102.