62
earplugs are nearly an order below the control response of the system, indicating significant damping at these frequencies.
While both earplugs dampen greatly in this range, the PU Foam dampens nearly a magnitude more than the Triple Flange at
certain frequencies. In contrast, both earplugs have a comparatively high response magnitude at 8, 9, and 10 kHz, showing
less effective damping of pressure at these ranges.
Fig. 11.4 FRF results over a broad frequency range comparing two earplugs to the response of the system with no earplug inserted
Fig. 11.5 3D topology and pore magnification at 100× of the PU Foam earplug
S. de Oliveira et al.
earplugs are nearly an order below the control response of the system, indicating significant damping at these frequencies.
While both earplugs dampen greatly in this range, the PU Foam dampens nearly a magnitude more than the Triple Flange at
certain frequencies. In contrast, both earplugs have a comparatively high response magnitude at 8, 9, and 10 kHz, showing
less effective damping of pressure at these ranges.
Fig. 11.4 FRF results over a broad frequency range comparing two earplugs to the response of the system with no earplug inserted
Fig. 11.5 3D topology and pore magnification at 100× of the PU Foam earplug
S. de Oliveira et al.