A time-domain analysis for aeroacoustics-structure interaction of flexible panel

H. K.H. Fan, Chi Kin Randolph Leung, G. C.Y. Lam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

A time domain numerical method is proposed to investigate flow effect to acoustics in a duct with flexible panel in the present paper. When a mean flow carrying a plane wave is passing over a flexible panel in a duct, complex aeroacoustics-structure interaction (ASI) will occur. The acoustic wave and flow will induce vibration of the panel. The vibration will then re-radiate wave back to the fluid. The flow, acoustics and flexible panel dynamics are affecting each other. A numerical model is developed to correctly solve such kind of ASI problem. The numerical model introduced in the paper involves three parts: aeroacoustic model, structural dynamic model and numerical coupling. The aeroacoustic model resolves flow dynamic and acoustics; and the structural dynamic model resolves the panel vibration. A numerical methodology is developed to make sure two models are strongly coupled together. The ASI model is verified with theoretical analysis. For a single frequency incident wave propagating in duct, we calculated transmission loss for different panel length. Actually, the flexible panel in duct can effectively reduce transmission of acoustic wave. The mechanism of transmission loss due to flexible panel will be discussed. However, the duct system behaves different when a mean flow is present. Cases with Mach number = 0.1, 0.5 and 0.8 are calculated. The transmission loss is found generally much smaller than cases without flow. The flow affects propagation of flexural wave on the panel and effect transmission loss change. This effect of flow will be discussed.
Original languageEnglish
Title of host publication19th AIAA/CEAS Aeroacoustics Conference
Pages129
Number of pages1
Publication statusPublished - 16 Sep 2013
Event19th AIAA/CEAS Aeroacoustics Conference - Berlin, Germany
Duration: 27 May 201329 May 2013

Conference

Conference19th AIAA/CEAS Aeroacoustics Conference
CountryGermany
CityBerlin
Period27/05/1329/05/13

ASJC Scopus subject areas

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

Cite this