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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.
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 StyleWei 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 StyleWei 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.
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.
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 StyleWei 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 StyleWei 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.
A bender disk transducer can generate low-frequency sound in a small size and light weight. But traditional bender disk transducer only works at single frequency by using first order bending mode and emits moderate levels of power. In this work, a double resonance bander disk low frequency transducer is investigated by using finite element model. The double resonance bender disk transducer consists of two segmented 3-3 mode piezoelectric ceramic disk on the both side of hollow metal disc, which could generate larger displacement in order to increase power radiation. A simple elastic mass system placed inside the hollow metal disc is introduced in the system to produce other lower resonance modes. Through the FEM calculations, it is found that the transmitting voltage response (TVR) of bender disk transducer could enhance 4dB in the first order bending mode resonance frequency, which is compared with traditional bender disk transducer with the same size. The TVR of lower resonance mode which is produced by additional central simple support elastic mass system in segmented bender disk transducer is more than 130dB. Through the optimization of finite element simulation, a double resonance bender disk transducer is designed, and its resonance frequency is 600Hz and 1kHz, respectively. The value of TVR is 130dB and 134dB corresponding to two resonance frequency. The double resonance bender disk transducer is compact dimension, low weight and it is a high performance low frequency transducer.
Wei Lu; Yu Lan; Tianfang Zhou. Finite element analysis of double resonance bender disk low frequency transducer. MATEC Web of Conferences 2019, 283, 05008 .
AMA StyleWei Lu, Yu Lan, Tianfang Zhou. Finite element analysis of double resonance bender disk low frequency transducer. MATEC Web of Conferences. 2019; 283 ():05008.
Chicago/Turabian StyleWei Lu; Yu Lan; Tianfang Zhou. 2019. "Finite element analysis of double resonance bender disk low frequency transducer." MATEC Web of Conferences 283, no. : 05008.
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.
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 StyleWei 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 StyleWei 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.
Improved d33 (412 pC/N), (553 pm V−1), Qm (583), ferroelectricity, and temperature stability were achieved in PZT-PMnN piezoceramics by SPS.
Li-Qian Cheng; Ze Xu; Chunlin Zhao; Hao-Cheng Thong; Zhen-Yong Cen; Wei Lu; Yu Lan; Ke Wang. Significantly improved piezoelectric performance of PZT-PMnN ceramics prepared by spark plasma sintering. RSC Advances 2018, 8, 35594 -35599.
AMA StyleLi-Qian Cheng, Ze Xu, Chunlin Zhao, Hao-Cheng Thong, Zhen-Yong Cen, Wei Lu, Yu Lan, Ke Wang. Significantly improved piezoelectric performance of PZT-PMnN ceramics prepared by spark plasma sintering. RSC Advances. 2018; 8 (62):35594-35599.
Chicago/Turabian StyleLi-Qian Cheng; Ze Xu; Chunlin Zhao; Hao-Cheng Thong; Zhen-Yong Cen; Wei Lu; Yu Lan; Ke Wang. 2018. "Significantly improved piezoelectric performance of PZT-PMnN ceramics prepared by spark plasma sintering." RSC Advances 8, no. 62: 35594-35599.
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.
Tianfang Zhou; Yu Lan; Qicheng Zhang; Jingwen Yuan; Shichang Li; Wei Lu. A Conformal Driving Class IV Flextensional Transducer. Sensors 2018, 18, 2102 .
AMA StyleTianfang 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 StyleTianfang Zhou; Yu Lan; Qicheng Zhang; Jingwen Yuan; Shichang Li; Wei Lu. 2018. "A Conformal Driving Class IV Flextensional Transducer." Sensors 18, no. 7: 2102.