Modal Analysis Based on the Random Decrement Transform

J. C. Asmussen, Rune Brincker, S. R. Ibrahim

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    Abstract

    During the last years several papers utilizing the Random Decrement transform as a basis for extraction of modal parameters from the response of linear systems subjected to unknown ambient loads have been presented. Although the Random Decrement technique was developed in a decade starting from the introduktion in 1968 the technique seems still to be attractive. This is probably due to the simplicity and the speed of the algorithm and the fact that the theory of the technique has been extended by introducing statistical measures such as correlation functions or spectral densities. The purpose of this paper is to present a state-of-the-art description of the Random Decrement technique where the statistical theory is outlined and examples are given. But also new results such as estimation of frequency response functions and quality assessment are introduced. Special attention is given to the theoretical background for the application of the Random Decrement transform to ambient measurements.
    Original languageEnglish
    Place of PublicationAalborg
    PublisherDept. of Building Technology and Structural Engineering, Aalborg University
    Number of pages17
    Publication statusPublished - 1998
    SeriesFracture and Dynamics
    Number110
    VolumeR9821
    ISSN1395-7953

    Bibliographical note

    Presented at NATO ASI on Modal Analysis and Testing, Sesimbra, Portugal, May 3-15, 1998

    PDF for print: 25 pp.

    Keywords

    • Random Decrement Technique
    • RDD
    • Modal Parameters
    • Unknown Ambient Loads
    • Correlation Functions
    • Spectral Densities
    • Frequency Response Functions
    • Quality Assessment
    • Ambient Measurements

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