Sensor Placement for Modal Parameter Subset Estimation: A Frequency Response-based Approach

Martin Dalgaard Ulriksen, Dionisio Bernal, Lars Damkilde

    Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

    2 Citations (Scopus)

    Abstract

    The present paper proposes an approach for deciding on sensor placements in the context of modal parameter estimation from vibration measurements. The approach is based on placing sensors, of which the amount is determined a priori, such that the minimum Fisher information that the frequency responses carry on the selected modal parameter subset is, in some sense, maximized. The approach is validated in the context of a simple 10-DOF mass-spring-damper system by computing the variance of a set of identified modal parameters in a Monte Carlo setting for a set of sensor configurations, whose anticipated effectiveness are ranked according to the noted criterion. It is contended that the examined max-min criterion satisfies the objective of optimizing the accuracy of an identification setup more effectively than the more commonly used trace or determinant of the Fisher information matrix (FIM). It is shown that the widely used Effective Independence (EI) method, which uses the modal amplitudes as surrogates for the parameters of interest, provides sensor configurations yielding theoretical lower bound variances whose maxima are up to 30 % larger than those obtained by use of the max-min approach.
    Original languageEnglish
    Title of host publicationProceedings of 8th European Workshop On Structural Health Monitoring (EWSHM 2016)
    EditorsAlfredo Güemes
    Number of pages10
    Place of PublicationMadrid
    PublisherUniversidad Politécnica de Madrid
    Publication date2016
    Publication statusPublished - 2016
    Event8th European Workshop On Structural Health Monitoring (EWSHM 2016) - Bilbao, Spain
    Duration: 5 Jul 20168 Jul 2016
    Conference number: 8
    http://www.ewshm2016.com/

    Workshop

    Workshop8th European Workshop On Structural Health Monitoring (EWSHM 2016)
    Number8
    Country/TerritorySpain
    CityBilbao
    Period05/07/201608/07/2016
    Internet address

    Keywords

    • Sensor placement approaches
    • Modal parameter estimation
    • Fisher information

    Fingerprint

    Dive into the research topics of 'Sensor Placement for Modal Parameter Subset Estimation: A Frequency Response-based Approach'. Together they form a unique fingerprint.

    Cite this