A Criterion for Piece-wise mid-frequency vibro-acoustic modelling using the condensed transfer function approach

Zhongyu Hu, Laurent Maxit, Li Cheng

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

1 Citation (Scopus)

Abstract

Analyses of vibro-acoustic systems in the mid-to-high frequency range aretechnically challenging due to the complex wavelength composition involved in different vibro-acoustic components. The problem needs to be tackled in order to cope with the crying need in various applications fields such as vehicles and buildings. In the present paper, an improved condensed transfer function (CTF) approach is proposed, using a benchmark model consisting of a plate-cavity system. In the improved CTF approach, the uncoupled subsystems are firstly modelled separately, by decomposing the force and velocity on the coupling surfaces between subsystems over a set of CTFs. The entire coupled system can then be assembled and solved by applying the force equilibrium and velocity continuity conditions over the coupling surfaces. The modelling efficiency is shown to be greatly increased by properly selecting the condensation functions in terms of their type and size. Itis shown that a better spatial match between the wavy feature of the condensation functions and the wavelength of the system would allow a more efficient modelling within a prescribed frequency range. Given a set of truncated CTF series, a piece-wise convergence behavioris observed, leading to the proposal of a convergence criterion. The proposed convergence criterion allows the entire system to be modelled in any prescribed frequency band, one at a time in a piece-wise manner, thus resulting in a great reduction in the computational time. The proposed criterion is then tested using various excitation and damping configurations in one-third octave bands.
Original languageEnglish
Title of host publicationINTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet
PublisherInstitute of Noise Control Engineering
Publication statusPublished - 1 Jan 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong Convention and Exhibition Centre (HKCEC), Hong Kong, Hong Kong
Duration: 27 Aug 201730 Aug 2017

Conference

Conference46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
Country/TerritoryHong Kong
CityHong Kong
Period27/08/1730/08/17

Keywords

  • Mid and high frequency
  • Substructure method
  • Vibro-acoustic

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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