School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
Sensors (Basel). 2018 Sep 17;18(9):3128. doi: 10.3390/s18093128.
A free-flooded transducer that couples the vibration of a longitudinal vibration transducer and the fluid cavity of an aluminum ring was investigated. Given the transducer is based on a fluid cavity structure and has no air cavity, it can resist high hydrostatic pressure when working underwater, which is suitable for application in the deep sea. At first, the structure and working principle of the transducer were introduced. Then, the axisymmetric finite element model of the transducer was established; and the transmitting voltage response, admittance, and radiation directivity of the transducer were simulated using the finite element method. According to the size of the finite element model, a prototype of the transducer was designed and fabricated, and the electro-acoustic performance of the prototype was measured in an anechoic water tank. The experimental results were consistent with the simulation results and showed a good performance of the transducer. Finally, the improvement of the radiation directivity of the transducer by the optimal design of the free-flooded aluminum ring was obtained using the finite element method and verified by experiments.
研究了一种自由淹没换能器，该换能器将纵向振动换能器的振动与铝环的流体腔耦合。由于该换能器基于流体腔结构且没有气腔，因此在水下工作时可以抵抗高静水压力，适用于深海应用。首先，介绍了换能器的结构和工作原理。然后，建立了换能器的轴对称有限元模型；并使用有限元法模拟了换能器的发射电压响应、导纳和辐射指向性。根据有限元模型的尺寸，设计并制造了换能器的原型，并在消声水池中测量了原型的电声性能。实验结果与模拟结果一致，表明换能器性能良好。最后，通过有限元法和实验验证了通过优化自由淹没铝环来提高换能器辐射指向性的效果。
