Numerical/Experimental Validation of Muffler Performance with Perforated Tubes

以數值分析及實驗法驗証穿孔管消音器性能

羅浩(H. Luo) ； 黃河潤(H. J. Huang) ； 吳鼎文(T. W. Wu) ； 曾智義(C. I. Tseng)

《中華民國振動與噪音工程學會論文集》 1997 (1997/05) Pp. 113-121

https://doi.org/10.30028/CSSVANNUAL.199705.0113

摘要

工業上廣泛使用之消音器內部有複雜元件，如薄板、支管、穿孔管等，其中以穿孔管最難模擬分析。本文以直接混體邊界元素法來預測穿孔管消音器之傳輸損失，且與實驗值做比對，並充份討論三型不同穿孔率消音器之特性。為節省計算時間，電腦程式可依低頻、高頻之不同需求自動調整邊界元網格，並以三點法取代傅統之四埠法來計算傳輸損失。結果顯示數值解與實驗值十分吻合，穿孔管消音器之特性可預測。

並列摘要

Mufflers and silencers widely used in industry usually contain complex internal geometry such as extended inlet/outlet tubes, thin baffles, branched cavities, and perforated tubes. In this paper, we use a direct mixed-body boundary element method (BEM) to predict the transmission loss (TL) and compare the results with experimental data. Three cylindrical mufflers with concentric perforated tubes, but with different perforation, are evaluated. The computer program has been set up in such a way that it automatically re-meshes at each frequency to save a significant amount of computational time. The transmission loss is evaluated by a direct three-point method, instead of the conventional four-pole theory. The numerical solutions show fairly good comparison with experimental data.