Abstract
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.
Highlights
Spiral electromagnetic waves have been used in aircraft navigation for about 70 years [1].Based on similar navigation principles, spiral sound waves have shown potential applications in underwater navigation
The experimental navigation system is simpler, lighter and easier to use than the traditional underwater navigation system
To realize orthogonal acoustic dipoles, we used eight longitudinally vibrating piezoelectric elements (LVPEs) sharing one tail mass assembled by equal intervals along the circumferential elements (LVPEs) sharing one tail mass assembled by equal intervals along the circumferential direction and they were numbered 1–8 in a counterclockwise direction, as shown in Figure 3a [12,13,14,15]
Summary
Spiral electromagnetic waves have been used in aircraft navigation for about 70 years [1]. A spiral may suffer a low response(TVR), large This makes the transducer (e.g., 90 kHz).
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