A study on crack detection using eigenfrequency test data

Lee, Young-Shin; Chung, Myung-Jee

doi:10.1016/s0045-7949(99)00194-7

Cited by 193 publications

(68 citation statements)

References 12 publications

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“…Various theoretical and experimental works [3][4][5][6][7][8][9][10] performed over the last three decades have indicated that the change in modal properties (natural frequencies and modes shapes) may be useful for the detection of a crack, as well as for the identification of both crack depth and location. Moreover, the influence of opening and closing of crack due to the shaft self-weight for various orientations of the shaft has been investigated [3,11] and showed the effectiveness of the change in natural frequencies versus the orientation of the shaft to detect the orientation of the crack front.…”

Section: Introductionmentioning

confidence: 99%

The influence of cracks in rotating shafts

Sinou

Lees

2005

Journal of Sound and Vibration

163

100

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In this paper, the influence of transverse cracks in a rotating shaft is analyzed. The paper addresses the two distinct issues of the changes in modal properties and the influence of crack breathing on dynamic response during operation. Moreover, the evolution of the orbit of a cracked rotor near half of the first resonance frequency is investigated. The results provide a possible basis for an on-line monitoring system. In order to conduct this study, the dynamic response of a rotor with a breathing crack is evaluated by using the Alternate Frequency/Time Domain approach. It is shown that this method evaluates the non-linear behaviour of the rotor system rapidly and efficiently by modeling the breathing crack with a truncated Fourier series. The dynamic response obtained by applying this method is compared with that evaluated through numerical integration. The resulting orbit during transient operation is presented and some distinguishing features of a cracked rotor are examined.

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Section: Introductionmentioning

confidence: 99%

The influence of cracks in rotating shafts

Sinou

Lees

2005

Journal of Sound and Vibration

163

100

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“…Generally, an assumption of linear-stationary structural response is made to allow the use of a Fourier-type transform to obtain the frequency content of measured vibration data, prior to employing peak-peaking to discern modal frequencies. The global nature of modal frequencies may not always lend itself well to damage localisation in complex structures [34][35][36], although they can be utilised to do so for more regular geometries when given the undamaged and damaged states, in addition to a sufficient number of frequencies depending on geometry complexity, for instance; two for a beam and three for an arch [37,38].…”

Section: Natural Frequenciesmentioning

confidence: 99%

A State of the Art Review of Modal-Based Damage Detection in Bridges: Development, Challenges, and Solutions

2017

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Abstract:Traditionally, damage identification techniques in bridges have focused on monitoring changes to modal-based Damage Sensitive Features (DSFs) due to their direct relationship with structural stiffness and their spatial information content. However, their progression to real-world applications has not been without its challenges and shortcomings, mainly stemming from: (1) environmental and operational variations; (2) inefficient utilization of machine learning algorithms for damage detection; and (3) a general over-reliance on modal-based DSFs alone. The present paper provides an in-depth review of the development of modal-based DSFs and a synopsis of the challenges they face. The paper then sets out to addresses the highlighted challenges in terms of published advancements and alternatives from recent literature.

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“…The curvature is often calculated from the measured displacement mode shapes by using a central difference approximation. Lee and Chung (2000) used the first four frequencies of a simulated cantilever beam to locate a single crack and assess their corresponding effectiveness. The crack depth was then approximated iteratively to match the frequency as closely as possible before the location of the crack was finally defined.…”

Section: B Mode Shape-based Damage Detectionmentioning

confidence: 99%

Damage Detection in Composite Beam Using Numerical Modal Analysis

E.V.V¹,

Chandrasekaran²

2008

Int. Jour. Des. Manf. Tech.

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There is a pressing need to develop effective techniques for structural health monitoring (SHM), so that the safety and integrity of the structures can be improved. The main objective of this study is to evaluate the damage detection techniques for the composite beam. Cost-effective and reliable damage detection is critical for the utilization of composite materials. The study is carried out both analytical and experimental methods for the detection of damage in composite materials and the results are presented in this paper. A crack in a structure will affect the modal parameters both locally as well as globally. The present work discusses the studies carried out using those parameters that get changed locally and globally as well as a procedure to identify the crack location. Structural damage detection has gained increasing attention from the scientific community since unpredicted major hazards, most with human losses, have been reported. Aircraft crashes and the catastrophic bridge failures are some examples. Since damage alters the dynamic characteristics of a structure, namely its eigen properties (natural frequencies, modal damping and modes of vibration), several techniques based on experimental modal analysis have been developed in recent years. A cantilever composite beam was considered and modeled. The crack was introduced and analyzes the propagation of the crack. The crack is a through-thickness one, growing along the breadth of the beam starting from one edge. The location of the crack is also moved from the fixed end to the free end along its length. The changes in natural frequencies are observed from analytical study, due to the presence of the crack at different locations and depths and 2-Dfinite element models were created the percentage change in frequency values are calculated. These results are confirmed by the experiments. The numerical finite element (FE) analysis is performed to complement the damage detection by using different algorithms. Due to refined analysis of FE approach, all the algorithms are viable of detecting the damage using the FE data. The add-on advantage of the damage detection algorithms (Gapped Smoothing Method and Strain Energy Method) is that the data from the healthy beam are not required as the reference, thus simplifying the detection process.

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A study on crack detection using eigenfrequency test data

Cited by 193 publications

References 12 publications

The influence of cracks in rotating shafts

The influence of cracks in rotating shafts

A State of the Art Review of Modal-Based Damage Detection in Bridges: Development, Challenges, and Solutions

Damage Detection in Composite Beam Using Numerical Modal Analysis

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