Sound Insulation Characterisitics of a New Sandwich Metamaterial with Active Resonators

The sandwich metamaterial is a kind of artificial periodic sandwich structure. Due to its special properties such as negative equivalent density and negative equivalent volume modulus, it has great properties in vibration isolation performance and lightweight characteristics, which is now opening up a new research field of vibration and noise reduction. To improve its sound insulation performance, a new sandwich acoustic metamaterial with built-in active resonators is designed. Its sound insulation performance is verified by numerical simulation, and the influence of its internal parameters is analyzed.