Design and simulation of multilayer hybrid foam material for acoustic application

Abstract

New acoustic multilayer absorber fabricated by coupling closed-cell metallic foam and open-cell polymeric foam, which aimed to develop a practical use of metallic foam in the noise control application. In prior, the individual sound absorption coefficient of both foam materials with different thicknesses measured by the impedance tube method as per ASTM E-1050. Using inverse characterization technique, the intrinsic properties needed for five parameter models in a numerical study are predicted. The measured characteristic impedance, complex wave propagation, and sound absorption coefficient of the individual foams are in close agreement with the prediction. Subsequently, a different configuration of multilayer absorber is modeled using obtained properties, and their acoustic performance is evaluated. The result indicates that the coupling of polymeric foam with metallic one exhibits enhanced sound absorption and usage of closed-cell metallic foam in noise control material. Furthermore, the result demonstrates that absorption capability entirely relies on the placement of polymeric foam in the configuration. The proposed hybrid multilayer absorber coupled with test bench car for interior acoustic study, where 5–30 dB is reduction is noticed in 1/3rd octave plot.

Polymeric Surfactants: Recent Advancement in Their Synthesis, Properties, and Industrial Applications

“…[41] Advanced research revealed numerous advantages of homo copolymer-based surfactants over other types, few of them are their cost-effectiveness and viable characterization. [42] Few such types have reported to be exploited as PMS in emulsion polymerizations. [43,44] Though, few random copolymers were also reported to have limitations because of their functional group adherence on to the particle surface that reduce their efficacy to be used in applications as paints, coatings, finishes, or polishes.…”

Experimentation, simulation, and statistical analysis of nanofillers reinforced bio‐based polyurethane foam for acoustical applications

“…[44] The non-acoustic parameters required for simulating flow resistivity, tortuosity, porosity, VSL, and TCL are obtained by inverse characteristics or by physical experiments. [45][46][47] The novelty of this study focuses on manufacturing biobased PU composite foam using the AHR technique, which is employed in various applications, including regulating equipment noise, automobiles, and aircraft. The impact of the wt% PVDF, MgO, and Ni on sound absorption and noise reduction coefficient are being evaluated.…”

“…[ 44 ] The non‐acoustic parameters required for simulating flow resistivity, tortuosity, porosity, VSL, and TCL are obtained by inverse characteristics or by physical experiments. [ 45–47 ]…”