弹性背腔穿孔管水消声器有限元分析

为提高穿孔管水消声器的消声性能,利用结构声耦合数值分析模型探究弹性壁与水介质的耦合作用对消声器传递损失的影响,分析弹性背腔腔壁的厚度和弹性模量以及采用弧形背腔时的弧形半径对消声性能的影响。数值分析研究结果表明:较刚性背腔条件下,弹性背腔穿孔管水消声器的低频吸声效果得到明显提高;减小弹性背腔壁的厚度和采用更小弹性模量的橡胶材料,或者采用较小半径的弧形弹性背腔可以降低弹性背腔穿孔管水消声器的吸声频率。同时,吸声效果也得到提高。

Finite element analysis of perforated tube water muffler with flexible dorsal cavity

In order to improve the performance of perforated tube muffler noise elimination of water utilization structure acoustic coupling numerical analysis model to explore the coupling effect of elastic wall with water medium the influence of transmission loss of muffler,and study the feasibility of the numerical method,and analyzed the elastic back cavity chamber wall thickness and modulus of elasticity and the arc of back arc radius when the cavity effect on the performance of noise elimination.The results of numerical analysis show that the low-frequency sound absorption effect of the perforated tube water muffler is significantly improved compared with that of the rigid dorsal cavity.Reducing the thickness of the elastic back cavity wall and adopting rubber material with smaller elastic modulus,or adopting curved elastic back cavity with smaller radius,can reduce the sound absorption frequency of the perforated tube water muffler of the elastic back cavity,and at the same time,the sound absorption effect is also improved.