Abstract: [Objective] In order to provide theoretical basis for the development of bionic wood sound absorption materials, the sound absorption structure of the bionic wood is designed according to the wood structure. Then, tests on various structural factors of the absorption structure are carried out in this study.[Method] The model of bionic wood sound absorption structure is built by Rhinoceros 3D software. The resonant sound absorption structure is prepared by 3D printed technology.[Result] 1) At low frequency,with the increase of perforation rate,the resonant frequency of 3D printed bionic wood sound absorption structure moves to high frequency,the peak value of sound absorption coefficient decrease; at high frequency,the resonant frequency moves to low frequency,the peak value of sound absorption coefficient increases. 2) At low frequency, with the increase of the diameter of the main pore,the resonant frequency of 3D printed bionic wood sound absorption structure is basically unchanged,the peak value of sound absorption coefficient decrease; at high frequency,the resonant frequency moves to high frequency,the sound absorption coefficient basically unchanged. 3) With the depth of accessory pore increase, the resonant frequency of 3D printed bionic wood sound absorption structure increases firstly and then decreases,but the sound absorption coefficient basically unchanged.4) There are two significant resonant frequencies in 3D printed bionic wood sound absorption structure,300 Hz and 3 500 Hz,respectively.[Conclusion] Perforation rate,diameter of the main pore and depth of the accessory pore present great influence on the sound absorption properties of 3D printed bionic wood sound absorption structure. 3D printed bionic wood sound absorption structure exhibit good sound absorption performance in low frequency 300 Hz and high frequency 3 500 Hz, which has similarities and differences with traditional wood absorbing materials.

Key words: wood, bionic, sound absorption, 3D printing, perforated plates