Triangular reentrant honeycomb metamaterial structure for broadband sound attenuation using shape memory polymers.

ABSTRACT: Passive noise cancellation (PNC) earmuffs are an effective solution for mitigating workplace noise exposure, ensuring compliance with the Health and Safety Executive (HSE) and Occupational Safety and Health Administration (OSHA) guidelines. However, conventional earmuffs require removal to allow for peer communication, exposing users to hazardous noise. This study addresses this issue by proposing a triangular reentrant honeycomb metamaterial design that facilitates the passage of low-to-mid-frequency waves (e.g. speech up to 3000 Hz) while blocking high frequency noise. Finite element modelling was used to evaluate the bandgaps created by the unit cell design and the effects of lattice layers on the resultant frequency response. Experiments performed using an impedance tube showed that th

SUBMITTER: Ejaz M 

PROVIDER: S-EPMC12540689 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature