Simulation and Experimental Investigation on End Plate Flexibility of Helmholtz Resonators

This study investigates the effect of varying mechanical properties of flexible materials on the resonance frequency of Helmholtz resonators. A simulation model was developed using COMSOL Multiphysics, which coupled the acoustic pressure field with the mechanical structural field to obtain the dynamic response of resonators with different end plate materials. The simulations were per-formed for two primary materials-PVC and aluminum foil-selected based on their contrasting me-chanical properties. To validate the simulation results, a hexagonal resonator prototype was fabricated using 3D printing technology with PLA material. The setup includes a speaker driven by a signal generator as the sound source. Two microphones were used to measure acoustic pressure. For the PVC material, an amplification peak was observed around 440 Hz, while for the aluminum material, two peaks were observed around 260 Hz and 570 Hz in both the experimental and simulation meth-ods. The results showed a good correlation between the experimental and simulation data. Using the developed model, a simulation was conducted by varying the Young’s modulus. The results illus-trated that as the stiffness of the material increases, the system's resonance frequency shifts upwards. This study highlights the potential of using flexible materials in Helmholtz resonator designs to fine-tune acoustic performance. The validated simulation model can serve as a tool for optimizing the acoustic behavior of resonators for various applications, such as noise attenuation and energy har-vesting, by adjusting material properties to achieve desired resonance characteristics.

Simulation and Experimental Investigation on End Plate Flexibility of Helmholtz Resonators Keywords:

Helmholtz resonator , flexible plate , resonance frequency , simulation