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Based on the advantages of the acoustic black hole(ABH) structure in energy focusing and displacement amplification during the regulation of flexural waves, a new type of ABH sandwich-shaped flexural vibration transducer was proposed. This transducer consists of a sandwich-shaped flexural vibration transducer and an ABH probe. Based on the Timoshenko beam theory, the theoretical model of the overall flexural vibration of the transducer was established using the transfer matrix method, and the calculated results were consistent with the finite element simulation results. The impedance frequency response characteristics, vibration modes, radiation acoustic field and vibration displacement of this transducer were discussed using the finite element method, and a comparative analysis was conducted with the catenary-shaped transducer. The results showed that the maximum sound pressure and vibration displacement of the ABH transducer under the same mode were greater than those of the catenary-shaped transducer, indicating that the ABH structure can efficiently enhance the displacement of flexural vibration and the radiation performance of the transducer, and is expected to be applied as a small-scale acoustic chemical reactor. Finally, a prototype of this transducer was fabricated, then its impedance characteristics and vibration modes were experimentally measured. The experimental results were in agreement with the simulation results.
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Keywords:
- acoustic black hole structure /
- ultrasonic transducer /
- flexural vibration /
- transfer matrix method
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