摘要
研究了基于增材制造的多孔材料制备方法,并开展了材料吸声特性的试验研究。基于熔融沉积成形(FDM)增材制造技术,构建了可快速实现多孔材料几何模型的直接填充法。建立了工艺参数与多孔材料结构参数的联系,通过设定打印件厚度、填充形式、填充率、打印线宽、打印层高、铺层角度等工艺参数,可以有效地控制多孔材料的厚度、孔结构形式、孔隙率、丝线尺寸、丝线角度等关键参数,避免了繁琐的大量微结构详细建模过程。采用双传声器阻抗管测试吸声系数,系统研究了多孔材料的厚度、丝线尺寸、孔结构形式等参数对吸声性能的影响规律。结果表明,对吸声峰值的大小影响最显著的是孔隙率(丝线间距),当孔隙率从20%增加至30%,吸声峰值从0.8增加至0.98;当孔隙率从30%增加至60%,吸声峰值从0.98减小至0.6。对吸声峰值对应的共振频率的大小影响最显著的是材料厚度,当材料厚度从10 mm增加至30 mm,吸声峰值对应的共振频率从6000 Hz减小至1750 Hz。研究工作验证了采用增材制造实现具有精确几何特征的多孔材料的可行性,为满足特定吸声性能需求的多孔材料定制开辟了广阔的途径。
The preparation method of porous material based on additive manufacturing was studied,and the experimental study on the sound absorption characteristics of the material was carried out.Based on the additive manufacturing technology of fused deposition modeling(FDM),a direct filling method which could quickly realize the geometric model of porous materials was constructed.The relationship between the process parameters and the structural parameters of porous materials was established.By setting the process parameters such as thickness of the printed part,filling form,filling rate,printing line width,printing layer height and layer angle,the key parameters such as thickness,pore structure form,porosity,bar size and angle of the porous materials can be effectively controlled,which avoids the tedious and detailed modeling process of a large number of microstructures.The sound absorption coefficient was measured by double microphone impedance tube.The effects of thickness,bar size and pore structure of porous material on sound absorption performance were systematically studied.The results show that the porosity(bar spacing)has the most significant influence on the sound absorption peak.When the porosity increases from 20%to 30%,the sound absorption peak increases from 0.8 to 0.98.When the porosity increases from 30%to 60%,the sound absorption peak decreases from 0.98 to 0.6.The most obvious influence on the resonant frequency corresponding to the sound absorption peak is the material thickness.When the material thickness increases from 10 mm to 30 mm,the resonant frequency corresponding to the sound absorption peak decreases from 6000 Hz to 1750 Hz.The research work in this paper verifies the feasibility of using additive manufacturing to realize porous materials with accurate geometric characteristics,and opens up a broad way for the customization of porous materials to meet specific sound absorption performance requirements.
作者
陈文炯
常润鑫
王小鹏
CHEN Wenjiong;CHANG Runxin;WANG Xiaopeng(Dalian University of Technology,Dalian 116023,China)
出处
《航空制造技术》
CSCD
北大核心
2022年第14期58-66,共9页
Aeronautical Manufacturing Technology
基金
国家自然科学基金(12072058)。
关键词
增材制造(AM)
工艺参数
多孔材料
直接填充法
吸声性能
Additive manufacturing(AM)
Process parameters
Porous materials
Direct filling method
Sound absorption performance
