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Andi Haris,Heow Pueh Lee 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
In this study, an impedance tube test was conducted to investigate low frequency sound transmission loss (STL) ofa sandwich panel with milli-perforated honeycomb core. Three different configurations of perforated honeycomb cores with3 mm diameter orifices are explored: (1) a global spiral, (2) four orifices per cell, and (3) six orifices per cell. It is found thatthe 3D-printed PLA honeycomb sandwich panel shows STL values from 34 dB to 59 dB within the frequency range of 100-1600 Hz. The spiral configuration outperforms the unmodified sandwich whereas the four and six orifice configurationsexhibit higher STL than the spiral for frequencies between 650 Hz and 900 Hz. Moreover, the in-plane and out-of-planecompression tests were performed to determine the effect of having milli-orifices on the mechanical properties of thehoneycomb core. It is concluded that the milli-perforated honeycomb core has the potential to produce a lightermultifunctional honeycomb sandwich panel with enhanced low frequency STL without a significant degradation in in-planecompression properties.