Acoustic Science and Technology Laboratory, Harbin Engineering University of China, Harbin 150001, China.
Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University), Ministry of Industry and Information Technology, Harbin 150001, China.
Sensors (Basel). 2018 Oct 29;18(11):3674. doi: 10.3390/s18113674.
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.
提出了一种由纵振单元组成的螺旋声波换能器。该换能器由 8 个均匀分布的径向纵振单元组成，可有效产生低频水下螺旋声波。我们讨论了螺旋声波的产生原理，它可以通过两个相差 90 度的正交声偶极子来合成。给出了用于发射螺旋声波的换能器的激励电压分布和换能器的测量方法。建立了换能器的三维有限元模型（FEM），用于模拟换能器的振动模式和声学特性。进一步，我们根据设计和模拟制作了一个螺旋声波换能器。结果表明，该换能器的谐振频率为 10.8 kHz，发射电压谐振为 140.5 dB。水下声场测量表明，我们基于纵振单元设计的换能器可以成功地产生螺旋声波。
