Abstract
Duct noise control is an important practical problem. This paper explores the vibro-acoustic mechanism of duct noise through the membrane in tandem. Validity and feasibility of the proposed analytical model is demonstrated by comparing existing simplified models and full direct aeroacoustic simulation solved with the CE/SE model. It is shown that the coupling effect between two membranes in tandem is not negligible to predict system response. Moreover, introduction of multimembranes is important or even the only efficient way to apply this passive control method in practice.
Highlights
How to obtain better duct noise control method has long been a long-term studying problem in industrial field [1,2,3]
In 2001, Huang [4] creatively proposed a new passive control method theoretically based on wave reflection and structural damping of a flexible membrane inspired by the investigation on flexible tube in human respiratory systems
An aeroacoustic model based on direct aeroacoustic simulation (DAS) approach is employed in the present study. e aeroacoustic problem is governed by the twodimensional compressible Navier–Stokes equations together with ideal gas law for calorically perfect gas. e normalized Navier–Stokes equations without the source can be written in the strong conservation form as follows: zU + z F − Fv + z G − Gv 0, (8)
Summary
How to obtain better duct noise control method has long been a long-term studying problem in industrial field [1,2,3]. Fan et al [10,11,12] conducted systematic numerical analysis on Huang’s flexible membrane model from the viewpoint of aeroacousticstructural interaction based on the conservation element and solution element (CE/SE) method; they found that the presence of flow with the incident wave in the flow direction mainly weakens the reflection. For the practical application of flexible membrane, the request of high tension force may be one of major barriers since larger tension force can produce better sound insulation effect [4]. To solve this problem, our idea is to introduce another membrane in tandem.
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