Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis

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

doi:10.1016/j.ndteint.2007.09.004

Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis

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

Department of Mechanical Engineering

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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 language	English
Pages (from-to)	223-234
Number of pages	12
Journal	NDT and E International
Volume	41
Issue number	3
DOIs	https://doi.org/10.1016/j.ndteint.2007.09.004
Publication status	Published - Apr 2008

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10.1016/j.ndteint.2007.09.004

Author's version
NOTICE: this is the author’s version of a work that was accepted for publication in NDT & E International. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in NDT & E International, vol 41, issue 3, 2008, DOI 10.1016/j.ndteint.2007.09.004
Accepted author manuscript, 257 KBLicence: Unspecified

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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.",

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AU - Neild, Simon A.

AU - Wilcox, Paul D.

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AB - 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.

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JO - NDT and E International

JF - NDT and E International

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ER -

Factors affecting the ultrasonic intermodulation crack detection technique using bispectral analysis

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