摘要
针对某水泥厂煤磨房主排风机排风筒50~5000 Hz宽频噪声的特点,设计了多孔吸声材料、无纺布和多孔板复合结构的阻性片式消声器。结合多孔吸声材料DB-Miki模型理论、声波透反射原理和声致循环流原理,建立消声器消声区域的等效声阻抗率数学模型,然后结合有限元法和传递矩阵法求解阻性片式消声器的传递损失,通过与实验测试的结果对比证明了该方法的正确性。在此基础上对阻性片式消声器内玻璃纤维棉的体积密度和纤维直径进行参数优化,结果表明选用纤维直径为10μm、体积密度为60 kg·m^(-3)规格的玻璃纤维棉的降噪效果最好。最后通过工程实例证明阻性片式消声器设计的合理性,为解决排风管道噪声问题提供了一定的参考。
According to the characteristics of 50−5000 Hz broadband noise in the main exhaust air duct of coal mill house in a cement plant,a resistive chip muffler composed of porous sound-absorbing material,non-woven fabric and porous plate composite structure is designed.Combined with the theory of porous sound absorbing material DB-Miki model,the principle of sound transmission and reflection as well as the principle of sound-induced circulation flow,the mathematical model of equivalent acoustic impedance in the silencing area of the muffler is established,and then the transmission loss of resistive plate muffler is solved by combining the finite element method and transfer matrix method.The correctness of this method is proved by comparing with the experimental results.On this basis,the volume density and fiber diameter of glass fiber cotton in the resistive chip muffler are optimized.The results show that the glass fiber cotton with the fiber diameter of 10μm and the volume density of 60 kg·m^(-3) has the best noise reduction effect.Finally,an engineering example is given to prove the rationality of the design of resistive plate muffler,which provides a certain reference for solving the noise problem of exhaust duct.
作者
杜云凯
王东强
张君浩
李忠文
董学武
DU Yunkai;WANG Dongqiang;ZHANG Junhao;LI Zhongwen;DONG Xuewu(School of Mechatronics Engineering,Zhongyuan University of Technology,Zhengzhou 450007,Henan,China;The Ministry of Advanced Textile Equipment Technology jointly established a collaborative innovation center,Zhongyuan University of Technology,Zhengzhou 450007,Henan,China;Zhengzhou Expert Technology Co.,Ltd.,Zhengzhou 450051,Henan,China;Henan Luchuang Engineering Design Co.,Ltd.,Zhengzhou 450061,Henan,China)
出处
《声学技术》
CSCD
北大核心
2023年第5期633-641,共9页
Technical Acoustics
基金
2020年度河南省高等学校重点科研项目(20A460030)
河南省高等学校青年骨干教师培养计划资助。
关键词
宽频噪声
阻性片式消声器
等效声阻抗率
玻璃纤维棉
broadband noise
resistive chip muffler
equivalent acoustic impedance
glass fiber cotton
