Abstract:The proposal and development of membrane-type acoustic metamaterials bring hope for the use of lightweight structures to effectively solve the problem of low-frequency noise. However, limited by the local-resonance mechanism, single-layer membrane-type acoustic metamaterials can only have excellent low-frequency sound insulation performances in a very narrow frequency range, which is difficult to meet the practical needs of broadband noise reduction for ship power equipment. In order to break through the narrow-band limitation of the local-resonance mechanism and to achieve excellent low-frequency broadband sound insulation performances, multi-layer membrane-type acoustic metamaterials with different configurations are proposed. Based on the concept of equivalent areal density, a sound insulation calculation model of the membrane-type acoustic metamaterial composite structures was established; In addition, through the double-reverberation method, the sound insulation performances of several configurations of large-scale membrane-type acoustic metamaterial composite structures under reverberation-field excitations were carried out to verify the effectiveness of the calculation model and to compare and analyze the low-frequency broadband sound insulation performances. This work provides a certain reference value for the analysis and practical engineering application of composite structures based on membrane-type acoustic metamaterials.
Key words: acoustics;wave motion;acoustic metamaterials;composite structures;sound insulation
杨坤1,杨明月2,崔世明2,吴恒亮2. 大尺寸薄膜型声学超材料复合结构低频宽带隔声性能研究[J]. 振动与冲击, 2022, 41(22): 14-22.
YANG Kun1,YANG Mingyue2,CUI Shiming2,WU Hengliang2. Low-frequency and broadband sound insulation performance of large-scale composite structures based on membrane-type acoustic metamaterials. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(22): 14-22.
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