Spectral Estimation by the Random DEC Technique

Rune Brincker, J. Laigaard Jensen, S. Krenk

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    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 of trig level, damping ratio, type of trig window, and selection of trig points is investigated. The RRD 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 be choice of trig window and the selection of trig points.
    ForlagDept. of Building Technology and Structural Engineering, Aalborg University
    Antal sider10
    StatusUdgivet - 1990
    NavnFracture and Dynamics

    Bibliografisk note

    PDF for print: 14 pp.

    Presented at the 9th International Conference on experimental Mechanics, Lyngby, Copenhagen, August 20-24, 1990


    • RDD
    • ARMA Models
    • Random Dec
    • Auto-Correlation Functions
    • Analytic Solution
    • Trig Level
    • Damping Ratio
    • Trig Points

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