Acoustoelastic MetaWall as Industrial Noise Barriers with Simultaneous Energy Harvesting Capability

摘要

In this article, the concept of simultaneous noise filtering and energy harvesting are fused to propose metamaterial (MetaWall) bricks made of rubber-metal-concrete composite, as an industrial building material. The MetaWall bricks are capable of filtering acoustics noises more effectively than conventional barriers while harvesting the electrical energy from the trapped acoustic pressure generated by the sound and vibration. MetaWall bricks are made of Acousto-Elastic Metamaterial (AEMM) unit cells as energy harvesting component in the wall. A unit AEMM cell of the brick consists of the concrete exterior, soft rubber inclusions and hard metallic resonators. To exploit the local resonance of the resonator and recover the trapped strain energy in the soft constituents of AEMM, piezoelectric wafers are placed inside each AEMM unit cell. The primary objective of the work is to examine the performance of the MetaWall bricks. A prototype of the MetaWall brick is simulated to verify the concept. The results show that the model could generate about 1.73mW power under 10KΩ resistive load.