Sound absorption of face-centered cubic sandwich structure with micro-perforations. (15th January 2020)

• Record Type: Journal Article
• Authors: Wang, Dong-Wei; Wen, Zhi-Hui; Glorieux, Christ; Ma, Li
• Is Part Of: Materials & design. Volume 186(2020)
• Publication Date: 2020-01-15
• Subjects: Sound absorption coefficient -- Micro-perforation -- Face-centered cubic -- Multifunction; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2019.108344
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: This paper presents a novel ultra-lightweight micro-perforated sandwich structure with face-centered cubic (FCC) core as a sound absorber, which encompasses excellent mechanical features as well as acoustic properties. The structure, which consists of air cavities and small perforations on both the top panel and the corrugated plates, is considered as a combination of multi-layered micro-perforated panel absorbers (MPPAs). A theoretical model that makes use of an equivalent electrical circuit (EEC) approach is established. Validation of the model with experimental results and numerical simulations shows good agreement. The dependence of the acoustic absorption on features of the perforations and of the FCC structure is discussed. Based on the observations, an optimized structure is proposed by using simulated annealing method to yield good acoustic absorption property in the low frequency range. Graphical Abstract: Unlabelled Image Highlights: Face-centered cubic sandwich structure is found to have the potential of acoustic insulation and absorption. The structure makes use of series and parallel micro-perforated panel absorbers and yields good performance in sound absorption. Simulated annealing method is applied to optimize the absorption performance at low frequencies. A rich palette of parameter design is possible for the multifunctional structure to yield good acoustic absorption performance at low frequencies.