Cracks Detection Using Active Modal Damping and Piezoelectric Components

Chomette, Baptiste; Fernandes, Amâncio; Sinou, Jean-Jacques

doi:10.1155/2013/126870

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…While in an actual NDT system the measurement data is obtained via an experiment in an actual NDT system, e.g. by using piezoelectric sensors (Michaels and Michaels 2003) or a scanning laser vibrometer (Ishak et al 2002) etc., the measurement data can be also generated via simulations (Chomette et al 2013). Mathematically, two types of approaches are related to NDT via numerical wave excitation.…”

Section: Introductionmentioning

confidence: 99%

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A dynamic XFEM formulation for crack identification

Zhang

Wang

Lahmer

et al. 2015

Int J Mech Mater Des

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Nelder-Mead (NM) and Quasi-Newton (QN) optimization methods are used for the numerical solution of crack identification problems in elastodynamics. Fracture is modeled by the eXtended Finite Element Method. The Newmark-b method with Rayleigh damping is employed for the time integration. The effects of various dynamical test loads on the crack identification are investigated. For a timeharmonic excitation with a single frequency and a short-duration signal measured along part of the external boundary, the crack is detected through the solution of an inverse time-dependent problem. Compared to the static load, we show that the dynamic loads are more effective for crack detection problems. Moreover, we tested different dynamic loads and find that NM method works more efficient under the harmonic load than the pounding load while the QN method achieves almost the same results for both load types.

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Section: Introductionmentioning

confidence: 99%

“…The dynamics of a system and its safety can be considerably affected by the presence of cracks. Crack detection methods based on dynamic load parameters are particularly efficient (Chomette et al 2013). The NDT method uses the measured amplitudes of a scattered single-frequency signal to identify the crack.…”

Section: Introductionmentioning

confidence: 99%

A dynamic XFEM formulation for crack identification

Zhang

Wang

Lahmer

et al. 2015

Int J Mech Mater Des

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“…Han [18] and Patel and Darpe [19] showed that the method based on fracture mechanics, using stress intensity factors and the energy release rate to calculate the stiffness, combined with a breathing function, can increase the efficiency of the dynamic analysis. Bifurcation diagram, orbit plot, and Poincare map were employed to investigate the numerical simulation of transient response of the cracked rotor system to find the nonlinear dynamic characteristic of the cracked rotor [20][21][22][23][24] based on the two basic model of open-close cracked rotor, both switching and breathing models. These studies exhibited the splendid visualized comparisons and provide the nonlinear signals directly for monitoring and diagnosing fault of rotating machines.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Breathing Cracked Rotor with Imposed Mass Eccentricity

Peng

Zhen

2015

Shock and Vibration

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The investigation of the effects of mass eccentricity on stability of a gravity dominated cracked Jeffcott rotor would generally provide practical applicability to crack detection and instability control of the heavy loading turbo-machinery system. Based upon the numerical Floquet method, the stability and bifurcations of the periodic time-dependent rotor with a transverse breathing crack are studied with respect to the varied mass eccentricity at different rotation speed, and the stability diagrams in the parameter plane are obtained which the previous studies have not covered. The numerical response of the cracked rotor system is also analyzed by the frequency spectrum to present the vibration characters while the rotation speed approaches the critical ratio. The detailed numerical eigenvalues of the transition matrix are applied to analyze the types of the bifurcations of the cracked rotor system. Three types of bifurcations are found and responses of the cracked rotor system at these bifurcations are presented for the visualized comparisons.

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“…Therefore, the recognition of this influence is very important due to its great values of practical application. There are a number of theoretical crack-modeling techniques in the literature, which can be basically grouped into two categories: lumped flexibility models [10][11][12][13][14][15] and continuous stiffness models [16][17][18][19][20][21][22]. For the lumped flexibility models, a crack is represented by a rotational spring.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the energy distribution near the cracktips, Swamidas et al [20] established continuous bending and shearing stiffness models for the cracked beams. Chomette et al [21], by means of the continuous beam models, proposed a new method to detect the small cracks in beam structures.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis for Cracked FGM Beams by Means of a Continuous Beam Model

Yang

Zhao

2015

Shock and Vibration

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Based on Euler-Bernoulli beam theory and a continuous stiffness beam model, the free vibration of rectangular-section beams made of functionally graded materials (FGMs) containing open edge cracks is studied. Assuming the material gradients follow exponential distribution along beam thickness direction, the conversion relation between the vibration governing equations of a FGM beam and that of an isotropic homogenous beam is deduced. A continuous function is used to characterize the bending stiffness of an edge cracked FGM beam. Thus, the cracked FGM beam is treated as an intact beam with continuously varying bending stiffness along its longitudinal direction. The characteristic equations of beams with different boundary conditions are obtained by transfer matrix method. To verify the validity of the proposed method, natural frequencies for intact and cracked FGM beams are calculated and compared with those obtained by three-dimensional finite element method (3D FEM) and available data in the literature. After that, further discussions are carried out to analyze the influences of crack depth, crack location, material property, and slenderness ratio on the natural frequencies of the cracked FGM beams.

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Cracks Detection Using Active Modal Damping and Piezoelectric Components

Cited by 9 publications

References 27 publications

A dynamic XFEM formulation for crack identification

A dynamic XFEM formulation for crack identification

Stability Analysis of a Breathing Cracked Rotor with Imposed Mass Eccentricity

Free Vibration Analysis for Cracked FGM Beams by Means of a Continuous Beam Model

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