Spectral Estimation by the Random Dec Technique

Rune Brincker, Jacob L. Jensen, Steen Krenk

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    Abstrakt

    This paper contains an empirical study of the accuracy of the Random Dec (RDD) technique. Realizations of the response from a single-degree-of-freedom system loaded by white noise are simulated using an ARMA model. The Autocorrelation function is estimated using the RDD technique and the estimated functions are compared to an analytic solution. The RDD and FFT techniques are compared, and the influence og trig level, damping ratio, type og trig window, and selection og trig points is investigated. The RDD technique appears to be accurate and fast compared to the FFT technique, and the technique is accurate also at small damping ratios and when the estimated functions contain only few points. It is illustrated how bias might be introduced or removed by the choice of trig window and the selection of trig points.
    OriginalsprogEngelsk
    TitelProceedings of the 9th International Conference on Experimental Mechanics : 20-24 August 1990, Copenhagen Denmark
    Antal sider10
    ForlagTechnical University of Denmark (DTU)
    Publikationsdato1990
    Sider2049-2058
    ISBN (Trykt)8777400356
    StatusUdgivet - 1990
    BegivenhedThe International Conference on Experimental Mechanics - Copenhagen, Danmark
    Varighed: 20 aug. 199024 aug. 1990
    Konferencens nummer: 9

    Konference

    KonferenceThe International Conference on Experimental Mechanics
    Nummer9
    LandDanmark
    ByCopenhagen
    Periode20/08/199024/08/1990

    Emneord

    • RDD
    • Random Dec technique
    • ARMA Models
    • FFT

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