Abstract:By combining the double layer honeycomb core with the perforated medium density fiberboard(MDF) facing sheet, a new type of wooden acoustic board is presented and it demonstrates an improved sound absorption performance across full frequency range. With the standing wave tube test, the orthogonal test revealed that the key influential structural parameters on sound absorption performance are the thicknesses of first honeycomb core and second honeycomb core instead of the perforated rate and hole diameter on facing sheet. In terms of the optimal structural parameters, the noise reduction coefficient(NRC) can achieve 60.17%, and the sound absorption rate at 250, 500, 1 000 and 2 000 Hz reach 24%, 60%, 70% and 90% respectively, showing a remarkable improvements in both absorption intensity and the frequency range.