Theoretical and experimental investigation on the low-frequency vibro-acoustic characteristics of a finite locally resonant plate

This study investigates the low-frequency vibro-acoustic characteristics of a finite locally resonant (LR) plate. A dynamic model LR plate consisting periodic arrays beam-like resonators attached to thin aluminum with simply supported boundary conditions is established, and average vibration response radiated efficiency are theoretically determined by using modal-superposition harmonic-balance methods. In addition, influence parameters number additional on performance Finally, experiment 8 × 10 uniformly distributed validates theoretical analysis results. The numerical experimental results show that has bandgap can suppress noise structure, position close resonance frequency resonators. bandgaps be influenced changing ranging from 370 425 Hz, which consistent prediction. plates proposed in this find potential applications attenuation noise.