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.
Highlights
Lightweight sandwich structures have been widely applied in machinery, aviation, construction and transportation thanks to their superior properties in terms of high specific stiffness and strength [1]
The validation of the model and effects of the geometric parameters in terms of perforation and sandwich structure are discussed
In order to validate the presented model and its assumptions, its predictions were compared with results in available literature, from experiments carried out using a standing wave tube, and of the finite element (FE) simulations
Summary
Lightweight sandwich structures have been widely applied in machinery, aviation, construction and transportation thanks to their superior properties in terms of high specific stiffness and strength [1]. Tang et al [10,11] proposed a hybrid structure with perforated honeycomb-corrugation core and yielded excellent values for the sound absorption coefficient (SAC) at low frequencies. Wang and coauthors [21] studied the acoustic properties of the parallel MPPAs with different cavity depths and extended the work to a periodic pattern [22]. In their papers, the local resonances of the parallel MPPA array resembled those of the individual MPPA. Lee and Kim [24] studied a parallel-arranged multilayer MPPs with a variety of cavity depths in order to enhance sound absorption performance. The structure has the potential in acoustic absorption at low frequencies and to be a multi-functional structure integrating mechanics, sound insulation as well as sound absorption
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