摘要
纤维材料以其良好的吸声效果而被广泛应用于减震降噪功能,可以作为吸声材料应用于航空航天、汽车等领域。通过试验与Delany-Bazley经验模型、经验模型和微观结构分析模型的交叉对比,校验微观结构分析模型表征多孔材料声学性能的有效性。基于微观结构分析模型,研究纤维半径和孔隙率对材料吸声性能的影响,比较单重和双重纤维多孔材料的吸声性能。进一步地,借助数值优化设计方法,获得最优声学性能的材料微观特征参数。结果表明,优化后的纤维多孔吸声材料在相同厚度的基础上,在选定频段内的吸声能力有所提升,并且双重孔隙材料表现出更加优异的低频吸声性能。
Fibrous materials are widely used in the function of shock absorption and noise reduction because of their excellent sound absorption performance,and can be used as sound absorption materials in aerospace,automobile and other fields.The effectiveness of the microstructure analysis model to characterize the acoustic properties of porous materials was verified by cross-comparison of experiments with Delany-Bazley empirical model,empirical model and microstructure analysis model.The effects of fiber radius and porosity on the sound absorption properties of the materials were studied by the microstructural analysis model,and the sound absorption properties of the single and dual porosity materials were compared.Furthermore,by means of numerical optimization design method,the material microscopic characteristic parameters of optimal acoustic properties were obtained.The results show that,on the basis of the same thickness,the sound absorbing ability of the optimized fibrous porous materials in the selected frequency band is improved.Moreover,the dual porosity materials exhibit better low-frequency sound absorption performance.
作者
曹海琳
丁莉
李丹
CAO Hailin;DING Li;LI Dan(Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Shenzhen Aerospace New Material Technology Co.,Ltd.,Shenzhen 518057,China)
出处
《电声技术》
2022年第12期14-20,共7页
Audio Engineering
基金
广东省重点领域研发计划项目(2020B010190002)
关键词
纤维材料
吸声系数
经验模型
优化设计
微观结构
fibrous materials
sound absorption coefficient
empirical formula
optimization design
microstructure
作者简介
曹海琳(1974—),女,博士,教授,研究方向为先进复合材料、特种工程材料。
