Abstract
A micro-perforated panel (MPP) is perceived as the next generation of sound absorbers which has an outstanding absorbing performance in the mid to high frequency range. However, MPPs often suffer from narrow absorption bandwidth and poor sound absorption in the low frequency range below 500Hz. Therefore, an MPP is backed by a panel-type resonator with installed multiple resonators (MPR), forming an MPP-MPR composite structure is proposed, which is able to improve the sound absorption performance in the low frequency region. The present study is aimed to optimize the resonators' resonant frequencies to further improve the low frequency absorption performance. A coupled vibroacoustic model is presented and particle swarm optimization (PSO) is employed to optimize the sound absorption performance. It is found that the optimization of all four resonators converged to four different resonant frequencies, improving absorption valleys. The optimization algorithm has demonstrated its ability to optimize the resonant frequencies of the resonators in improving the low frequency absorption, while also extending the half-absorption bandwidth.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: INTER-NOISE and NOISE-CON Congress and Conference Proceedings
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
