关键词: 声学, 扩张式消声器, 内插管, 有限元

Abstract:

This article focuses on acoustic performance of expansion chamber mufflers with intubation pipes, Transmission losses of expansion muffler is obtained by using the finite element method, the difference was analyzed with intubation expansion muffler and without intubation, and the influence on acoustic performance with different intubation structure is compared. The calculation suggests that there is no noise reduction for some pass frequency without intubation expansion muffler, and it can eliminate these pass frequency increase intubation. When the flow area is maintained constant, the acoustic performance is improved using parallel structure with multiple intubations at high frequency substantially.