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Membrane-type acoustic metamaterial can decrease sound transmission by 500% over mass law predictions in the frequency range of 100Hz to 1000Hz. Membrane-type acoustic metamaterial stresses the structure design of elements, in order to reduce the best sound insulation frequency, broaden frequency range of the sound insulation and increase transmission loss(TL) magnitude. In this work, we established a membrane-type acoustic metamaterial element with high density polyethylene (HDPE) membrane and lead. Numerical simulation showed that this membrane-type acoustic metamaterial element has strong sound insulation effect at frequencies (20Hz-100Hz) and broadens the low frequency sound insulation range greatly. The central mass significantly influences the TL, and we found that the best sound insulation frequency can be acquired by adjusting the mass magnitude of centrally single mass. In addition, we designed a kind of membrane-type acoustic metamaterials with multimasses, and studied the sound insulation property by changing the number, distribution type and mass magnitude of surrounding masses on the membrane. Result showed that the number, distribution type and mass magnitude of surrounding masses have different impacts on the sound insulation frequency, the peak number of TL, and the frequency band of sound insulation

Transmission loss of thin membrane-type acoustic metamaterials with multi-masses