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首页> 外文期刊>Advances in Mechanical Engineering >3D Acoustic Modelling of Dissipative Silencers with Nonhomogeneous Properties and Mean Flow
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3D Acoustic Modelling of Dissipative Silencers with Nonhomogeneous Properties and Mean Flow

机译：具有非均质特性和平均流量的耗散消音器的3D声学建模

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摘要

A finite element approach is proposed for the acoustic analysis of automotive silencers including a perforated duct with uniform axial mean flow and an outer chamber with heterogeneous absorbent material. This material can be characterized by means of its equivalent acoustic properties, considered coordinate-dependent via the introduction of a heterogeneous bulk density, and the corresponding material airflow resistivity variations. An approach has been implemented to solve the pressure wave equation for a nonmoving heterogeneous medium, associated with the problem of sound propagation in the outer chamber. On the other hand, the governing equation in the central duct has been solved in terms of the acoustic velocity potential considering the presence of a moving medium. The coupling between both regions and the corresponding acoustic fields has been carried out by means of a perforated duct and its acoustic impedance, adapted here to include absorbent material heterogeneities and mean flow effects simultaneously. It has been found that bulk density heterogeneities have a considerable influence on the silencer transmission loss.
机译：提出了一种用于汽车消音器声学分析的有限元方法，该方法包括具有均匀轴向平均流量的穿孔导管和带有异质吸收材料的外室。这种材料可以通过其等效的声学特性（通过引入异质堆积密度和相应的材料气流电阻率变化来考虑坐标依赖）来表征。已经实施了一种方法来解决非运动的非均质介质的压力波方程，这与在外腔中传播声音的问题有关。另一方面，考虑到存在移动介质，已经根据声速势求解了中央管道中的控制方程。两个区域和相应的声场之间的耦合是通过穿孔的导管及其声阻抗来实现的，在此适用于同时吸收吸收材料的异质性和平均流动效应。已经发现，堆积密度的异质性对消音器的传输损耗有很大的影响。

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