Breakthrough acoustic shield cancels noise without airflow loss

Researchers at Boston University’s Zhang Lab have developed a novel broadband acoustic silencer called the Phase Gradient Ultra-Open Metamaterial (PGUOM) that effectively cancels noise across a wide range of frequencies while preserving airflow. Unlike previous narrowband sound shields, PGUOM adapts to dynamic, real-world noise environments—such as airports, offices, and factories—where sound frequencies and volumes fluctuate unpredictably. The device uses a phase-gradient structure to convert incoming sound waves into surface waves that dissipate along the material, with a design that includes open central cells to maintain ventilation without sacrificing noise reduction. This innovation marks a significant advancement over earlier fixed, uniform designs by offering customizable frequency ranges and airflow levels tailored to specific applications. The PGUOM’s ability to balance broad-spectrum noise suppression with minimal airflow resistance makes it highly suitable for integration into commercial ventilation systems and public infrastructure. The research team has progressed from simulations to physical prototypes and is working on scalable manufacturing methods. Motivated by the health impacts