-
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 is proposed in this work. 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 is established by the transfer matrix method, and the calculated results are consistent with the finite element simulation results. The impedance frequency response characteristics, vibration modes, radiation acoustic field and vibration displacement of this transducer are discussed by the finite element method, and a comparative analysis is conducted with the catenary-shaped transducer. The results show that the maximum sound pressure and vibration displacement of the ABH transducer under the same mode are 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 utilized as a small-scale acoustic chemical reactor. Finally, a prototype of this transducer is fabricated, then its impedance characteristics and vibration modes are experimentally measured. The experimental results are in agreement with the simulation results.
-
Keywords:
- acoustic black hole structure /
- ultrasonic transducer /
- flexural vibration /
- transfer matrix method
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] -
悬链线共振
频率/kHz声黑洞共振频率/ kHz m =1.8 m = 2.1 m = 2.4 m = 2.7 m = 3 一阶 2.5 3.1 2.3 1.8 1.5 1.2 二阶 5.9 6.4 5.8 5.3 4.8 4.4 三阶 10.1 10.9 10.0 9.4 8.9 8.4 四阶 15.0 16.1 15.0 14.1 13.5 13.0 五阶 20.8 22.4 20.8 19.6 18.8 17.9 六阶 27.7 29.9 27.7 26.1 24.7 23.7 
DownLoad: CSV
材料 钢 PZT-4 铝 密度/
(kg·m–3)7850 7500 2700 泊松比 0.28 — 0.33 杨氏模量
/GPa或
弹性矩阵
/GPa205 ${\left[ {\begin{array}{*{20}{c}} {139}&{77.8}&{74.3}&0&0&0 \\ {77.8}&{139}&{74.3}&0&0&0 \\ {74.3}&{74.3}&{115}&0&0&0 \\ 0&0&0&{25.6}&0&0 \\ 0&0&0&0&{25.6}&0 \\ 0&0&0&0&0&{30.6} \end{array}} \right]}$ 70
DownLoad: CSV
振动频率/kHz 误差/% 理论 仿真 一阶 1.293 1.289 0.31 二阶 4.448 4.432 0.36 三阶 8.518 8.649 1.51 四阶 13.161 13.045 0.88 五阶 18.202 17.979 1.24 六阶 23.948 23.645 1.28
DownLoad: CSV
入水深度/mm 声黑洞结构 悬链线结构 共振频率/kHz 最大声压/Pa 共振频率/kHz 最大声压/Pa 25 22.815 9.57×105 26.680 3.01×105 50 22.211 4.22×105 26.035 3.42×104 75 21.719 4.96×104 25.476 6.54×103
DownLoad: CSV
-
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22]
DownLoad:
Catalog
Metrics
- Abstract views: 1622
- PDF Downloads: 31
- Cited By: 0