Abstract：A core component of a zero-equivalent-mass metamaterial underwater acoustic projector based on acoustic metamaterials——the emission cover is designed, and the local resonance acoustic emission mechanism and the multi-unit synergistic coupling acoustic emission mechanism are revealed. The structure obtains a large surface vibration speed through local resonance when the equivalent mass is zero, thereby achieving a higher sound pressure level. Through the synergistic coupling between multiple units, the structure achieves local resonance at different positions, and widens the working frequency band. A new type of small-size low-frequency broadband metamaterial underwater acoustic projector based on this mechanism is designed, the parameters are optimized by finite element method, and the prototype is made according to the optimization results, its diameter is 400mm, height is 240mm, and total weight is 46kg. The test result shows that the projector has a good emission response within 40-1050Hz, and the average transmitting current response is about 146dB, which is consistent with the theoretical simulation calculation results. This new research of this paper provides a new idea for the development and improvement of metamaterial underwater acoustic projector, and has application prospects.
雷云中，王轲，吴九汇. 低频大宽带超结构水声发射换能器研制[J]. 振动与冲击, 2022, 41(7): 167-173.
LEI Yunzhong, WANG Ke, WU Jiuhui. Development of underwater acoustic projector with low frequency, large bandwidth and superstructure. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 167-173.
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