On the sensitivity of elastic waves due to structural damages: Time–frequency based indexing method

Gangadharan, R.; Mahapatra, D. Roy; Gopalakrishnan, S.; Murthy, C. Siva Ram; Bhat, M.R.

doi:10.1016/j.jsv.2008.09.008

Cited by 36 publications

(20 citation statements)

References 25 publications

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“…The echoes presented in Fig. 2 were obtained running the algebraic algorithm given by Eqs 7, (9) and 11, for an impulsive excitation.…”

Section: Damage Scenarios Addressedmentioning

confidence: 99%

“…Damage identification can be addressed from the point of view of wave propagation approach. It is well known that damage identification approaches built on wave propagation are highly sensitive to changes in local dynamic impedance [8][9][10], such as those caused by small defects. Although these approaches are much more uncommon in the literature than the vibration ones [17,33,43], they have the advantage of being directly defined in the time domain, yielding fast techniques with good accuracy [39].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Damage Identification in Bars with a Wave Propagation Approach and a Hybrid Optimization Method

Tenenbaum¹,

Fernandes²,

Stutz³

et al. 2012

Shock and Vibration

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The formulation and solution of the inverse problem of damage identification based on wave propagation approach are presented. Different damage scenarios for a bar are considered. Time history responses, obtained from pulse-echo synthetic experiments, are used to identify damage position, severity and shape. In order to account for noise corrupted data, different levels of signal to noise ratio – varying from 30 to 0 dB – are introduced. In the identification process, different optimization methods are investigated: the deterministic Levenberg-Marquardt; the stochastic Particle Swarm Optimization; and a hybrid technique combining the aforementioned methods. It is shown that the damage identification procedure built on the wave propagation approach was successful, even for highly corrupted noisy data. Test case results are presented and a few comments on the advantages of deterministic and stochastic methods and their combination are also reported. Finally, an experimental validation of the sequential algebraic algorithm, used for modeling the direct problem, is presented.

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“…The echoes presented in Fig. 2 were obtained running the algebraic algorithm given by Eqs 7, (9) and 11, for an impulsive excitation.…”

Section: Damage Scenarios Addressedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damage Identification in Bars with a Wave Propagation Approach and a Hybrid Optimization Method

Tenenbaum¹,

Fernandes²,

Stutz³

et al. 2012

Shock and Vibration

View full text Add to dashboard Cite

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“…Guided waves bear great potential for applications in non-destructive testing [1,2] and structural health monitoring [3,4] with their propagation properties in cylindrical structures, such as rods and pipes, being of particular interest in engineering applications e.g. pipeline inspection [5,6].…”

Section: Introductionmentioning

confidence: 99%

Computation of dispersion relations for axially symmetric guided waves in cylindrical structures by means of a spectral decomposition method

2015

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“…[13]. Gangadharan [14] used wavelet transform (WT) and Hilbert-Huang transform (HHT) to quantify the damage parameters like damage size and material degradation factors. Analytical, numerical and experimental analysis of Lamb wave propagation in a narrow beam and plate with a notch simulating damage and the effect of such a damage on various different Lamb wave modes were reported in ref.…”

Section: Introductionmentioning

confidence: 99%

Lamb wave based detection of damage in a stiffener bonded to a plate

et al. 2011

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Stiffener is one of the major components of aircraft structures to increase the load carrying capacity. Damage in the stiffener, mostly in the form of crack is an unavoidable problem in aerospace structures. Stiffener is bonded to the inner side of the aircraft panel which is not accessible for immediate inspection. A sensor-actuator network can be placed on the outer side of the panel that is accessible. Ultrasonic lamb waves are transmitted through stiffener using the sensoractuator network for detecting the presence of damages. The sensor-actuator network is placed on both halves of the stiffened section on the accessible surface of the plate. Detecting damage in stiffener by using this technique has significant potential for SHM technology. One of the major objectives of the present work is to determine the smallest detectable crack on the stiffener using the proposed technique. Wavelet based damage parameter correlation studies are carried out. In the proposed scheme, with increase in the damage size along the stiffener, it is found that the amplitude of the received signal decreases monotonically. The advantage of this technique is that the stiffened panels need not be disassembled in a realistic deployment of SHM system.

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On the sensitivity of elastic waves due to structural damages: Time–frequency based indexing method

Cited by 36 publications

References 25 publications

Damage Identification in Bars with a Wave Propagation Approach and a Hybrid Optimization Method

Damage Identification in Bars with a Wave Propagation Approach and a Hybrid Optimization Method

Computation of dispersion relations for axially symmetric guided waves in cylindrical structures by means of a spectral decomposition method

Lamb wave based detection of damage in a stiffener bonded to a plate

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