Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis

Charles R. P. Courtney, Bruce W. Drinkwater, Simon A. Neild, Paul D. Wilcox

Research output: Contribution to journalArticle

41 Citations (Scopus)
43 Downloads (Pure)

Abstract

This paper concerns the development of ultrasonic intermodulation as a method of robustly detecting cracks in engineering components. The bispectrum signal processing technique is used to analyse the nonlinear response of a sample to continuous excitation at two frequencies. The increased nonlinearity due to defects such as fatigue cracks is detected. The technique is shown to be insensitive to the support conditions and excitation positions. The importance of the shape of the excited modes is demonstrated and suggests that global inspection can be achieved only by exciting multiple modes. This multimode approach is then applied to the detection of cracking of a steel steering actuator bracket.
Original languageEnglish
Pages (from-to)223-234
Number of pages12
JournalNDT and E International
Volume41
Issue number3
DOIs
Publication statusPublished - Apr 2008

Fingerprint

Crack detection
Intermodulation
intermodulation
Steel
Signal processing
Actuators
cracks
ultrasonics
Inspection
Ultrasonics
Cracks
Defects
brackets
excitation
signal processing
inspection
actuators
nonlinearity
steels
engineering

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Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis. / Courtney, Charles R. P.; Drinkwater, Bruce W.; Neild, Simon A.; Wilcox, Paul D.

In: NDT and E International, Vol. 41, No. 3, 04.2008, p. 223-234.

Research output: Contribution to journalArticle

Courtney, Charles R. P. ; Drinkwater, Bruce W. ; Neild, Simon A. ; Wilcox, Paul D. / Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis. In: NDT and E International. 2008 ; Vol. 41, No. 3. pp. 223-234.
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