Improved Sound Absorption Properties in Polyurethane Foams by the Inclusion of Al2O3 Nanoparticles

<div>(a) PU foam and (b) Al2O3/PU foam acoustic cavity section sound pressure topography in 125 Hz, 375 Hz, 625 Hz, 875 Hz, 1125 Hz, and 1250 Hz. (c) The average sound pressure change curve of PU foam and Al2O3/PU foam.</div>

Shock and Vibration

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Figure 5

Figure 5: Improved Sound Absorption Properties in Polyurethane Foams by the Inclusion of Al2O3 Nanoparticles