Modal moment index for damage detection in beam structures

    Authors

    D. W. Nicholson;K. A. Alnefaie

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Acta Mech.

    Keywords

    Mechanics

    Abstract

    Health monitoring and damage detection in structures such as airframes are crucial to their safety and performance. Damage-induced changes in natural frequencies, damping ratios and mode shapes can be detected using experimental modal analysis (EMA), which has recently enjoyed intense research for application in structural health monitoring. A main theme of the current research has been to formulate a parameter, calculated using the measured changes in eigenparameters, which exhibits a significant "jump" at the damage location and whose value is a direct measure of the severity of the damage. A damage-sensitive parameter thus serves to localize the damage and to assess its severity, and it should likewise minimize the likelihood of false indications or of missing damage. Here, using finite element analysis of the damaged cantilevered beam. we study several existing parameters and introduce a new parameter called the Modal Moment Index (MR II). MMI is shown to jump sharply at the damage site and to have a direct relationship to the damage level.

    Journal Title

    Acta Mechanica

    Volume

    144

    Issue/Number

    3-4

    Publication Date

    1-1-2000

    Document Type

    Article

    Language

    English

    First Page

    155

    Last Page

    167

    WOS Identifier

    WOS:000166375400003

    ISSN

    0001-5970

    Share

    COinS