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.

• 摘要工业上广泛使用之消音器内部有复杂元件，如薄板、支管、穿孔管等，其中以穿孔管最难模拟分析。