We have investigated to optimize the double-panel structure (DPS) with locally resonant sonic crystal (LRSC) to achieve reduction of the low-frequency sound transmission.
We proposed a type of sonic crystal (SC) with slots elongated into the cylindrical shells and called the slot-type Helmholtz resonator array (SHRA).
During the optimization study for broadband sound insulation of DPS with SHRA in the low frequency region lower than 700 Hz, it was shown that it can form and extend the low frequency band gap.
First, the ranges of the slot length and width are determined to form the resonant peak in a given frequency range using the finite element analysis.
Next, the optimizations using the Monte Carlo method are performed for the incidences of the plane waves with uniform and non-uniform spectral densities.
As a result, it is found that our proposed weighted single-objective optimization method is effective in elimination of the transmission peaks and improving the overall sound insulation performance.
The result was published in "Journal of Theoretical and Computational Acoustics" under the title of "Design optimization for broadband sound insulation by double-panel structure with a slot-type Helmholtz resonator low frequency range"(https://doi.org/10.1007/s12648-024-03082-x).
