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Titolo: A direct transform method for the analysis of laser Doppler anemometry engine data
Autore: Roberts, JB; Hilton, ADM;
 Indirizzi:
 Univ Sussex, Sch Informat Technol & Engn, Brighton BN1 9QT, E Sussex, England Univ Sussex Brighton E Sussex England BN1 9QT BN1 9QT, E Sussex, England Univ Surrey, Ctr Vis Speech & Signal Proc, Guildford GU2 5XH, Surrey, England Univ Surrey Guildford Surrey England GU2 5XH ord GU2 5XH, Surrey, England
 Titolo Testata:
 PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART DJOURNAL OF AUTOMOBILE ENGINEERING
fascicolo: D6,
volume: 215,
anno: 2001,
pagine: 725  738
 SICI:
 09544070(2001)215:D6<725:ADTMFT>2.0.ZU;2K
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 FLOW;
 Keywords:
 internal combustion engines; incylinder flow; laser Doppler anemometry (LDA) measurements; cycletocycle variation; turbulence; flow models;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Engineering, Computing & Technology
 Citazioni:
 12
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Roberts, JB Univ Sussex, Sch Informat Technol & Engn, Brighton BN1 9QT, E Sussex, England Univ Sussex Brighton E Sussex England BN1 9QT Sussex, England



 Citazione:
 J.B. Roberts e A.D.M. Hilton, "A direct transform method for the analysis of laser Doppler anemometry engine data", P I MEC E D, 215(D6), 2001, pp. 725738
Abstract
A new, computationally efficient method of fitting a specific parametric stochastic model of incylinder flow to real laser Doppler anemometry (LDA) internal combustion engine data, obtained either at a single position in space or over a range of spatial positions at effectively one point in the engine cycle (scanning data) is proposed. The model, which is fully specifiedin terms of a set of parameters, assumes that the velocity variations can be modelled as the sum of ail ensembleaveraged mean component, a nonstationary 'turbulence' component and a random 'cycletocycle' component, the last of these being phase locked to the engine cycles. The fitting techniqueis based on a direct transform of the velocity data obtained in each cycleand leads to an identification of the meansquare magnitudes of the turbulence and cycletocycle components. A unique advantage of this approach is that it is possible to determine, theoretically, confidence limits for the estimates of the statistics or the fluctuation components. This provides a theoretical means or designing experiments to achieve a prescribed level ofaccuracy. The estimation method, and the theoretical determination of confidence limits, is validated initially through application to some simulateddata which fully capture all the characteristics inherent in real data. Finally some results of analysing real incylinder LDA data, of the scanning type, are presented. Although the approach proposed here is applied to a particular model of incylinder flow it is, in principle, extendable to othermodels.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 06:50:17