Statistical pattern analysis of ultrasonic signals for fatigue damage detection in mechanical structures

Shalabh Gupta, Dheeraj S. Singh, Asok Ray

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper addresses online monitoring of fatigue damage in polycrystalline alloy structures based on statistical pattern analysis of ultrasonic sensor signals. The real-time data-driven method for fatigue damage monitoring is based on the concepts derived from statistical mechanics, symbolic dynamics and statistical pattern identification. The underlying concept is detection and identification of small changes in statistical patterns of ultrasonic data streams due to gradual evolution of anomalies (i.e., deviations from the nominal behavior) in material structures. The statistical patterns in terms of the escort distributions from statistical mechanics are derived from symbol sequences that, in turn, are generated from ultrasonic sensors installed on the structures under stress cycles. The resulting information of evolving fatigue damage would provide early warnings of forthcoming failures, possibly, due to widespread crack propagation. The damage monitoring method has been validated by laboratory experimentation in real time on a computer-controlled fatigue damage testing apparatus which is equipped with a variety of measuring instruments including an optical travelling microscope and an ultrasonic flaw detector.

Original languageEnglish (US)
Pages (from-to)491-500
Number of pages10
JournalNDT and E International
Volume41
Issue number7
DOIs
StatePublished - Oct 1 2008

Fingerprint

Damage detection
Fatigue damage
ultrasonics
Ultrasonics
damage
Ultrasonic sensors
Statistical mechanics
Monitoring
statistical mechanics
stress cycles
warning
sensors
experimentation
crack propagation
Crack propagation
Microscopes
Detectors
Defects
microscopes
anomalies

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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Statistical pattern analysis of ultrasonic signals for fatigue damage detection in mechanical structures. / Gupta, Shalabh; Singh, Dheeraj S.; Ray, Asok.

In: NDT and E International, Vol. 41, No. 7, 01.10.2008, p. 491-500.

Research output: Contribution to journalArticle

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