Abstract
The combination structure of a porous metal and microperforated panel was optimized to develop a low frequency sound absorber. Theoretical models were constructed by the transfer matrix method based on the Johnson-Champoux-Allard model and Maa's theory. Parameter optimizations of the sound absorbers were conducted by Cuckoo search algorithm. The sound absorption coefficients of the combination structures were verified by finite element simulation and validated by standing wave tube measurement. The experimental data was consistent with the theoretical and simulation data, which proved the efficiency, reliability, and accuracy of the constructed theoretical sound absorption model and finite element model. The actual average sound absorption coefficient of the microperforated panel + cavity + porous metal + cavity sound absorber in the 100-1800 Hz range reached 62.9615% and 73.5923%, respectively, when the limited total thickness was 30 mm and 50 mm. The excellent low frequency sound absorbers obtained can be used in the fields of acoustic environmental protection and industrial noise reduction.
| Original language | English |
|---|---|
| Article number | 1507 |
| Journal | Applied Sciences (Switzerland) |
| Volume | 9 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 11 Apr 2019 |
Keywords
- Combination structure
- Experimental validation
- Finite element simulation
- Low frequency sound absorption
- Microperforated panel
- Parameter optimization
- Porous metal
ASJC Scopus subject areas
- General Materials Science
- Instrumentation
- General Engineering
- Process Chemistry and Technology
- Computer Science Applications
- Fluid Flow and Transfer Processes