Higher Order Coherences for fatigue crack detection

Jyoti K. Sinha

doi:10.1016/j.engstruct.2008.10.004

Higher Order Coherences for fatigue crack detection

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Abstract

Higher 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. © 2008 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	534-538
Number of pages	4
Journal	Engineering Structures
Volume	31
Issue number	2
DOIs	https://doi.org/10.1016/j.engstruct.2008.10.004
Publication status	Published - Feb 2009

Keywords

Bicoherence
Fatigue crack
Higher Order Coherences
Tricoherence
Vibration responses

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title = "Higher Order Coherences for fatigue crack detection",

abstract = "Higher 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. {\textcopyright} 2008 Elsevier Ltd. All rights reserved.",

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AB - Higher 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. © 2008 Elsevier Ltd. All rights reserved.

KW - Bicoherence

KW - Fatigue crack

KW - Higher Order Coherences

KW - Tricoherence

KW - Vibration responses

U2 - 10.1016/j.engstruct.2008.10.004

DO - 10.1016/j.engstruct.2008.10.004

M3 - Article

SN - 0141-0296

VL - 31

SP - 534

EP - 538

JO - Engineering Structures

JF - Engineering Structures

IS - 2

ER -

Higher Order Coherences for fatigue crack detection

Abstract

Keywords

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