Tuning an Acoustic Metamaterial Using Iso-Geometric Analysis and Evolutionary Shape Optimization

In this study a novel acoustic metamaterial design is proposed and optimized to enhance the sound intensity at a targeted frequency. The analyses were performed by combining Isogeometric analysis and high order farfield expansion absorbing boundary conditions. The shape optimization was performed using Differential Evolution efficiently with control point locations defined as design variables. Numerical and experimental experiments confirmed the possibility of customizing the proposed metamaterial to enhance the amplitude of the incoming sound at desired frequencies. As a result, the proposed metamaterial can serve as the basis of developing novel low-cost acoustic sensors.