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Titolo:
Analysis of low frequency acoustic response in a damped rectangular enclosure
Autore:
Pan, J; Elliott, SJ; Baek, KH;
Indirizzi:
Univ Western Australia, Dept Mech & Mat Engn, Nedlands, WA 6907, AustraliaUniv Western Australia Nedlands WA Australia 6907 nds, WA 6907, Australia Univanduthampton, Inst Sound & Vibrat Res, Southampton SO9 5NH, Hants, Engl Univ Southampton Southampton Hants England SO9 5NH n SO9 5NH, Hants, Engl
Titolo Testata:
JOURNAL OF SOUND AND VIBRATION
fascicolo: 4, volume: 223, anno: 1999,
pagine: 543 - 566
SICI:
0022-460X(19990617)223:4<543:AOLFAR>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Pan, J Univ Western Australia, Dept Mech & Mat Engn, Nedlands, WA 6907, Australia Univ Western Australia Nedlands WA Australia 6907 6907, Australia
Citazione:
J. Pan et al., "Analysis of low frequency acoustic response in a damped rectangular enclosure", J SOUND VIB, 223(4), 1999, pp. 543-566

Abstract

This paper is concerned with the prediction of acoustic response in a welldamped rectangular enclosure. The acoustic characteristics of the enclosure are modelled using the modal expansion approach, with suitable modification of the damping and frequency shift introduced into the rigid wall acoustic modes of the enclosure. The prediction of acoustical transfer impedance in the enclosure has demonstrated that a frequency dependent modal parameter may be used to describe the acoustic response. This modal parameter is defined as the specific acoustical modal admittance, which describes the contribution of all the boundaries (locally and modally reactive and air leakage) to the modal damping and the shift of nature frequencies. The sound absorption properties of each boundary type and its effect on the response of the enclosure are analysed. The predicted and measured space-average acoustic transfer impedances in a damped rectangular enclosure are compared and reasonable agreement is found. The Helmholtz resonance effect of the cockpit in a helicopter is also included in the model. The measured dip at about 23Hz in the space-average acoustic impedance inside the passenger cabin of the helicopter is accurately predicted. (C) 1999 Academic Press.

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Documento generato il 30/11/20 alle ore 03:18:21