Abstract
The average sound absorption coefficient of a composite absorber from 0 to 1.6 kHz was maximized using a teaching–learning-based optimization algorithm, where the geometric parameters were used as optimization variables. The effective-medium model and transfer-matrix method were used to calculate the sound absorption coefficient, and optimized sound absorption coefficient was maximized at 0.938. The specific acoustic impedance of the material is almost perfectly matched with air thanks to the optimized size of the lateral plates, micro-perforated plates, and cavities. Experimental results confirm the theoretical calculation, showing the investigated passive acoustic design method of designing sound absorber.
| Original language | English |
|---|---|
| Article number | 108288 |
| Journal | Applied Acoustics |
| Volume | 183 |
| DOIs | |
| State | Published - 1 Dec 2021 |
Keywords
- Broadband sound absorption
- Composite absorber
- Equivalent medium models
- JCA model
- Optimal design
- Transfer-matrix method