作 者：
贾世芳;刘静怡;林贤铣;孙伟圣;郭玺;曹惠敏;王文斌
摘 要：
以中密度纤维板为基材,通过设计穿孔结构及打孔方式,达到拓宽木质穿孔板吸声频带和提高声学性能的目的。利用分层加工工艺制备了带侧孔结构的穿孔纤维板,采用阻抗管传递函数法对穿孔纤维板吸声性能进行了测试。通过正交试验方法,研究了主孔直径、穿孔率、倾斜角度对穿孔纤维板吸声性能的影响,并获得了较优的制备工艺,随后利用控制变量法研究了侧孔深度对穿孔纤维板吸声性能的影响。试验结果表明:影响穿孔纤维板吸声系数峰值的因素主次顺序为倾斜角度>主孔直径>穿孔率;穿孔纤维板获得良好吸声系数峰值的优选工艺参数为主孔直径3 mm、穿孔率3.14%、倾斜角度30°;增加侧孔结构后,穿孔纤维板在中低频、中高频均表现出良好的吸声特性;侧孔深度对穿孔纤维板中高频共振频率和吸声性能影响较大,当侧孔深度为4 mm时,仿生木材结构穿孔纤维板在中高频段共振频率为3 632 Hz,吸声系数峰值可达0.67。本研究为穿孔吸声板的结构设计提供参考,解决了复杂孔型加工的技术难题,对多频段吸声木质穿孔板的工业化应用具有重要意义。
译 名：
Sound absorption performance of bionic perforated wood structure fiberboard
作 者：
JIA Shifang;LIU Jingyi;LIN Xianxian;SUN Weisheng;GUO Xi;CAO Huimin;WANG Wenbin;School of Engineering,Zhejiang A&F University;
关键词：
sound absorption;;perforated fiberboard;;bionic;;wood structure;;side hole
摘 要：
Noise pollution has become a widespread topic as same as water pollution,air pollution and waste pollution.The prevention and control of noise by using sound absorption material,which can absorb sound waves within different frequency bands and then decrease the damage of noise,have attracted many researchers. Perforated wood panel is a kind of resonant sound absorbing structural material,but the existing perforated wood panel just has the absorption effect on the low frequency,which can not satisfy the demand of some special acoustic environments,and the research of wooden perforated boards with a multi-band sound absorbing function has a high value. In this study,the perforated sound absorption panels were prepared with the inspiration of wood multilevel pore structure and using the medium density fiberboard as the matrix. The sound absorption broadband and acoustic intensity performance of the perforated wood panels were greatly improved. The complex hole structure of perforated fiberboard was produced using the layered processing technology and the sound absorption properties of the perforated fiberboards were tested by the impedance tube transfer function method. The effects of main hole diameter,perforation rate and inclined angle on the sound absorption properties of perforated fiberboards were investigated by the orthogonal test method,and the optimal preparation process was achieved. Then the influence of side hole depth on the sound absorption properties of perforated fiberboard was studied using the control variable method. The results showed that the order for affecting the peak sound absorption coefficient of the perforated fiberboard was as the inclined angle > diameter of the main hole >perforation rate; the preferred processing parameters of perforated fiberboard were 3 mm hole diameter,3.14% perforation rate and 30° inclined angle; the sound absorption properties of perforated fiberboard at the low and medium high frequencies were both improved after the addition of side holes; the depth of the side holes had a great influence on the sound absorption property of perforated fiberboard at the high frequency resonance frequency; three resonance absorption peaks were observed over the whole frequency band( 64-6 300 Hz) when the side hole was deeper than 1 mm.The bionic perforated fiberboard showed that the best sound absorption coefficient( 0.67) was at 3 632 Hz when the side hole depth was 4 mm. In this study,the novel perforated sound absorbing panels could be fabricated using the layered processing method,which was important for realizing the industrial production of perforated wood panels with good sound absorption performance.
