锥管结构消声性能的有限元分析-噪声与振动控制.PDF

第34 卷 第5 期 噪 声 与 振 动 控 制 Vol 34 No.5 2014 年10月 NOISE AND VIBRATION CONTROL Oct. 2014 文章编号：1006-1355(2014)05-0214-05 锥管结构消声性能的有限元分析 司 斌 ，陈 剑，李家柱 （合肥工业大学 噪声振动工程研究所，合肥 230009 ） 摘 要：声学性能和空气动力学性能是评价消声器的两项重要指标，锥管结构因其良好的空气动力学性能和低频 消声性能受到相关研究人员的关注。运用有限元数值计算方法，以传递损失作为评价指标，探索其结构参数对扩张式 消声器消声性能的影响。研究发现，随着锥角增大，锥管消声频带向高频方向扩展；锥管长度主要影响消声带宽；扩散 管口与收缩管口面积比主要影响消声峰值；锥管结构运用于扩张式消声器中对传递损失曲线具有移频、降幅、改善通 过频率处消声性能的作用。 关键词：声学；锥管结构；有限元法；结构参数；传递损失 + 中图分类号：U464.134 文献标识码：A DOI 编码：10.3969/j.issn. 1006-1335.2014.05.046 FiniteFinite ElementElement AnalysisAnalysis ofof AcousticAcoustic AttenuationAttenuation PerformancePerformance ofof ConicalConical SilencingSilencing StructureStructure SI Bin , CHEN Jian , LI Jia-zhu ( Institute of Noise and Vibration, Hefei Polytechnical University, Hefei 230009, China ) AbstractAbstract : Acoustic performance and aerodynamic performance are two important indexes for muffler’s evaluation. Conical silencing structure has attracted more and more attentions for its low frequency acoustic and low flow-resistance characteristics. In this paper, using the finite element method and taking the transmission loss as the evaluation index, the influence of the structural parameters on the acoustic characteristics of the conical silencer is analyzed. The results show that when the cone angle increases, the anechoic band will extend in the direction to the high frequency. The length of the conical structure mainly affects the anechoic bandwidth, and the area ratio of the diffusion tube to the cont