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Higher Order Coherences for fatigue crack detection

Sinha, Jyoti K.

AbstractHigher Order Coherences (normalized Higher Order Spectra) are the tools to identify the relationship between the different harmonic components in a signal. The vibration of a structure having a crack also generates several harmonics of the exciting frequency due to its breathing (closing and opening) behaviour which is a non-linear phenomenon. Presently two types of the HOC — namely, the Bicoherence and the Tricoherence, are used for the fatigue crack detection. This paper presents the observations made on the HOC on the numerically simulated experiment of a cantilever beam with and without cracks. The robustness of the HOC in the crack detection even for the noisy response vibration data has also been brought out.

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Higher Order Coherences for fatigue crack detection

Sinha, Jyoti K.

AbstractHigher Order Coherences (normalized Higher Order Spectra) are the tools to identify the relationship between the different harmonic components in a signal. The vibration of a structure having a crack also generates several harmonics of the exciting frequency due to its breathing (closing and opening) behaviour which is a non-linear phenomenon. Presently two types of the HOC — namely, the Bicoherence and the Tricoherence, are used for the fatigue crack detection. This paper presents the observations made on the HOC on the numerically simulated experiment of a cantilever beam with and without cracks. The robustness of the HOC in the crack detection even for the noisy response vibration data has also been brought out.

Higher Order Coherences for fatigue crack detection

Sinha, Jyoti K.

AbstractHigher Order Coherences (normalized Higher Order Spectra) are the tools to identify the relationship between the different harmonic components in a signal. The vibration of a structure having a crack also generates several harmonics of the exciting frequency due to its breathing (closing and opening) behaviour which is a non-linear phenomenon. Presently two types of the HOC — namely, the Bicoherence and the Tricoherence, are used for the fatigue crack detection. This paper presents the observations made on the HOC on the numerically simulated experiment of a cantilever beam with and without cracks. The robustness of the HOC in the crack detection even for the noisy response vibration data has also been brought out.

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Title:

Higher Order Coherences for fatigue crack detection

Contributors:

Sinha, Jyoti K. (author)

Published in:

Engineering Structures ; 31 ; 534-538

Publication date:

2008-10-03

Size:

5 pages

ISSN:

DOI:

https://doi.org/10.1016/j.engstruct.2008.10.004

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Fatigue crack , Vibration responses , Higher Order Coherences , Bicoherence , Tricoherence

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