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激光烧结复合仿生木材多孔结构的吸声性能

The Sound Absorption Performance of Laser-Sintered Composite Biomimetic Wood Porous Structures.

作者信息

Zou Li, Zhang Aitian, Liu Zhenbo, Du Pengfei, Guo Yanling

机构信息

College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China.

College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China.

出版信息

Polymers (Basel). 2024 Nov 26;16(23):3290. doi: 10.3390/polym16233290.

DOI:10.3390/polym16233290
PMID:39684035
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11644403/
Abstract

This study investigates the development of biomimetic sound-absorbing components through laser sintering technology, drawing inspiration from wood's natural porous structure. Using a pine wood powder/phenolic resin composite, various specimens were fabricated with different structural configurations (solid, fully porous, and varying straight-pore ratios) and cavity thicknesses. Sound absorption performance was evaluated using the impedance tube transfer function method. The effect of different composite structures, placement orientations, and cavity thicknesses on sound absorption performance was evaluated. The results demonstrate that solid laser-sintered samples exhibit inherent sound absorption properties due to microscopic pores, with absorption coefficients exceeding 0.234. The biomimetic wood-like structure, featuring multi-scale porosity at both microscopic and mesoscopic levels, shows enhanced broadband sound absorption, particularly in mid-high frequencies, with characteristic double-peak absorption curves. The study reveals that absorption performance can be optimized by adjusting structural parameters and thickness, enabling targeted frequency-specific sound absorption. This research establishes the feasibility of creating multi-frequency sound-absorbing materials using laser-sintered biomimetic wood structures, providing a foundation for future applications and development in acoustic engineering.

摘要

本研究通过激光烧结技术，借鉴木材的天然多孔结构，对仿生吸声部件的开发进行了研究。使用松木粉/酚醛树脂复合材料，制备了具有不同结构配置（实心、全多孔以及不同直孔率）和腔体厚度的各种试样。采用阻抗管传递函数法评估吸声性能。评估了不同复合结构、放置方向和腔体厚度对吸声性能的影响。结果表明，固体激光烧结样品由于微观孔隙而具有固有吸声特性，吸声系数超过0.234。具有微观和介观多尺度孔隙率的仿生木材状结构表现出增强的宽带吸声性能，特别是在中高频，具有特征性的双峰吸收曲线。研究表明，通过调整结构参数和厚度可以优化吸收性能，实现特定频率的靶向吸声。本研究确立了使用激光烧结仿生木材结构制造多频吸声材料的可行性，为声学工程的未来应用和发展奠定了基础。

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