The influence of baffle fairings on the acoustic performance of rectangular splitter silencers
The influence of baffle fairings on the acoustic performance of rectangular splitter silencers
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DOI：
10.1121/1.2010267
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发表时间：
2005-10
影响因子：
2.4
通讯作者：
R. Kirby
中科院分区：
文献类型：
--
作者：
R. Kirby
建立了一种基于有限元法的有限长度HVAC分流消声器的数值模型。该模型包括一个任意数量的散装反应分离器从气道分离的薄穿孔金属片，并容纳在入射声场中的高阶模式。每个穿孔板连接到位于分流器两端的刚性、不渗透的金属整流罩。的消声器的传输损失是量化的点配置技术的应用，并预测文献中报道的实验测量结果进行比较。分离器整流罩显着影响消声器的性能，特别是当高阶入射模式存在。它的结论是，实验室测量，理论预测，主要是基于平面波声源是不可能准确地反映在一个真实的管道系统中的HVAC消声器的真实性能。
A numerical model based on the finite element method is developed for a finite length, HVAC splitter silencer. The model includes an arbitrary number of bulk-reacting splitters separated from the airway by a thin perforated metal sheet and accommodates higher-order modes in the incident sound field. Each perforated sheet is joined to rigid, impervious, metallic fairing situated at either end of a splitter. The transmission loss for the silencer is quantified by application of the point collocation technique, and predictions are compared to experimental measurements reported in the literature. The splitter fairing is shown to significantly affect silencer performance, especially when higher-order incident modes are present. It is concluded that laboratory measurements, and theoretical predictions, that are based on a predominantly plane wave sound source are unlikely to reflect accurately the true performance of an HVAC silencer in a real ducting system.