Crack identification in a cantilever beam from modal response

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

A damage detection and assessment algorithm is developed based on system identification using a finite element model and the measured modal response of a structure. The measurements are assumed to be sparse and polluted with noise. A change in an element constitutive property from a baseline value is taken as indicative of damage. An adaptive parameter grouping updating scheme is proposed to localize the damage zones in the structure and a Monte Carlo method is used with a data perturbation scheme to provide a statistical basis for assessing damage. Damage indices computed from the Monte Carlo sample of data perturbations are used to assess damage. The threshold values, which distinguish damage from measurement noise, are established through Monte Carlo simulation on the baseline structure. The proposed algorithm is applied to the problem of locating a crack in a cantilever beam. A Bernoulli-Euler beam model and a plane stress model are employed to illustrate the use of the method and compare the efficacy of the two models for crack detection.

Original languageEnglish (US)
Pages (from-to)527-545
Number of pages19
JournalJournal of Sound and Vibration
Volume198
Issue number5
DOIs
StatePublished - Dec 19 1996
Externally publishedYes

Fingerprint

cantilever beams
modal response
Cantilever beams
cracks
damage
Cracks
Crack detection
Damage detection
Identification (control systems)
Monte Carlo methods
Euler-Bernoulli beams
perturbation
plane stress
system identification
noise measurement
Monte Carlo method
thresholds

ASJC Scopus subject areas

  • Engineering(all)
  • Mechanical Engineering

Cite this

Crack identification in a cantilever beam from modal response. / Hjelmstad, Keith; Shin, S.

In: Journal of Sound and Vibration, Vol. 198, No. 5, 19.12.1996, p. 527-545.

Research output: Contribution to journalArticle

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