双质量块薄膜型声学超材料的隔声特性分析OA

Based on the principle of metamaterial sound insulation,a type of dual-mass membrane-type acoustic metamaterial is proposed and its sound insulation characteristics is studied by experiments and finite element method,and based on the numerical method,the influencing factors of its acoustic inslulation characteristiccs are furtherly analyzed.Research results show that the dual-mass membrane-type acoustic metamaterial can produce two peaks of acoustic loss in the middle and low frequency.Increasing the radius or thickness of the mass block on the membrane makes the sound transmission loss curve move to the low-frequency region.With Increasing the distance between the mass blocks,the corresponding frequencies of the first and second acoustic insulation peaks decrease and then increase.When the distance between the mass blocks is near 1.2 mm,the minimum of the frequency corresponding to the first sound insulation peak is 440 Hz.When the distance between the mass blocks is near 2.4 mm,the minimum of the frequency corresponding to the second sound insulation peak is 685 Hz.Reducing film thickness or pre-stress makes the sound transmission loss curve move to the low-frequency region.