Fig. 4: Numerical simulation results in terms of received temporal signals and corresponding analysis.
From: Laser-powder bed fusion printed CrMnFeCoNi high entropy alloys engineered for acoustic insulation
A Temporal waveforms of fully solid, additional damper layer, hollow phononic crystal, and random voids cases, respectively. B Zoomed in view of the temporal waveform from the random voids case.C Fourier transformation obtained acoustic frequency spectrums from the temporal signal in (A). D Time-dependent lateral averaged wave amplitude along the wave propagation direction (sample building direction) Z, showing the localization effect. E Averaged acoustic intensity spatially along the sample length (wave propagation direction) shows Anderson localization-induced exponential decay. The red arrows indicate the localization region F Normalized frequency-dependent sound insulation with respect to a fully solid case. G Frequency-dependent phase delay obtained from the Fourier transformation of the temporal signals shows the acoustic dispersion effects. H Calculated frequency-dependent localization length in the random void case.
