Inverse problem methodology and finite elements in the identification of cracks, sources, materials, and their geometry in inaccessible locations

Hoole, S. Ratnajeevan H.; Subramaniam, S.; Saldanha, R.R.; Coulomb, J.L.; Sabonnadière, Jean‐Claude

doi:10.1109/20.79086

Cited by 91 publications

(18 citation statements)

References 14 publications

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“…The reconstruction of the electromagnetic properties of an inaccessible area of investigation [1]- [4] can be obtained processing the scattered electromagnetic radiation collected in a non-invasive fashion on a measurement region external to an investigation area. As far as microwave imaging techniques are concerned, they lack of sufficient collectable information on the scenario under test.…”

Section: Introductionmentioning

confidence: 99%

An iterative procedure for combining the advantages of a multi-frequency and multi-resolution inversion algorithm

Franceschini

Donelli

Tamanini

et al. 2006

2006 First European Conference on Antennas and Propagation

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Starting from the iterative multi-scaling approach previously studied for monochromatic illuminations, two multiresolution strategies for dealing with multi-frequency inverse scattering experiments have been developed. The first procedure is based on the integration of the iterative multi-scaling algorithm into a frequency-hopping reconstruction scheme, while in the second one the multi-frequency data are simultaneously processed exploiting a multi-resolution expansion of the problem unknowns. The numerical and the experimental analysis presented in this contribution concern with a preliminary assessment of the reconstruction effectiveness of the proposed approaches in comparison with a monochromatic multi-step process.

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Section: Introductionmentioning

confidence: 99%

An iterative procedure for combining the advantages of a multi-frequency and multi-resolution inversion algorithm

Franceschini

Donelli

Tamanini

et al. 2006

2006 First European Conference on Antennas and Propagation

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“…The first group of models are numerical models such as a finite element model or integral equation models (Hoole et al 1991;Caorsi et al 1994;Monebhrrun et al 1998;Yan et al 1998;Balasubramanian et al 2001;Li et al 2001;Kim et al 2003;Arunachalam 2006;Connolly et al 2009), and although accurate, tend to be computationally expensive because the models must be solved during each iteration. Alternative forward models based on neural networks have also been proposed (Qing et al 1997;Zhang and Gupta 2000;Ramuhalli et al 2002Ramuhalli et al , 2003aJoshi 2006).…”

Section: Fault Diagnosticsmentioning

confidence: 99%

Prognostics and Health Management in Nuclear Power Plants: A Review of Technologies and Applications

Coble¹,

Ramuhalli²,

Bond³

et al. 2012

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Recent years have seen a resurgence of nuclear power worldwide, with interest in extending the operating life of the approximately 436 reactors currently in service (as of March, 2012), 61 new reactors being constructed, and as many as 162 under consideration. Renewed worldwide interest in nuclear power has been somewhat tempered by the March 2011 incident at Fukushima Dai-ichi in Japan. However, nuclear power is still considered a key element in meeting future worldwide sustainable energy, energy security, and emissions goals. Currently, three separate thrusts to safe and economical nuclear power development for energy security are being pursued in the United States: (i) longer term operation for the legacy fleet, from 40-60 and possibly 60-80 years; (ii) near-term new nuclear plants with a 60-year design life; and (iii) small modular reactors, which are expected to employ light water reactor technology at least in the medium term. Within these activities, attention is turning to enhanced methods for plant component and structural health management.The operating U.S. fleet includes 104 light water reactors. In addition, there are now (as of May 2012) four new nuclear power plants (AP-1000 plants) under construction in the United States, and two delayed plants are being completed by the Tennessee Valley Authority. There is also interest in the United States in small modular reactors (SMRs), which could be easier to match to existing grid infrastructure and which could replace aging coal fired plants. The current low price for natural gas presents a challenge to the economics of nuclear power, at least in the short term; however, some recent studies have demonstrated that nuclear generation will be competitive in the longer term (at least in some markets) when anticipated escalation in gas prices and the cost of building, operating, and maintaining gas-fired plants are considered over those same time periods.This report reviews the current state of the art of prognostics and health management (PHM) for nuclear power systems and related technology currently applied in field or under development in other technological application areas, as well as key research needs and technical gaps for increased use of PHM in nuclear power systems. The historical approach to monitoring and maintenance in nuclear power plants (NPPs), including the Maintenance Rule for active components and Aging Management Plans for passive components, are reviewed. An outline is given for the technical and economic challenges that make PHM attractive for both legacy plants through Light Water Reactor Sustainability (LWRS) and new plant designs. There is a general introduction to PHM systems for monitoring, fault detection and diagnostics, and prognostics in other, non-nuclear fields. The state of the art for health monitoring in nuclear power systems is reviewed. A discussion of related technologies that support the application of PHM systems in NPPs, including digital instrumentation and control systems, wired and wireless sensor techno...

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“…The original object shape can be reconstructed by numerically time reversing the scattering process. The inverse scattering technique has been widely studied for various applications [1][2][3][4][5] such as computed tomography, nondestructive evaluation, and geophysical remote sensing.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Imaging of Two-Dimensional Geometries by Multipulse Interference Using the Inverse FDTD Method

Okada

Cole

2014

Advances in Optical Technologies

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The size, shape, and location of unknown objects in the ground and in the body can be estimated by an electromagnetic imaging technique. An imaging approach to clear detection of two-dimensional geometries is proposed in this paper. Based on the inverse finite-difference time-domain (FDTD) method, a phase interference technique using multidirectional pulses is employed. The advantage of the proposed method is that it can clearly reconstruct the geometry in a simple calculation. Sample imaging results are demonstrated. The analysis of the FDTD results shows that the detectable object size is limited by the incident wavelength and the measurement spacing and illustrates the detectability of multiple objects.

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Inverse problem methodology and finite elements in the identification of cracks, sources, materials, and their geometry in inaccessible locations

Cited by 91 publications

References 14 publications

An iterative procedure for combining the advantages of a multi-frequency and multi-resolution inversion algorithm

An iterative procedure for combining the advantages of a multi-frequency and multi-resolution inversion algorithm

Prognostics and Health Management in Nuclear Power Plants: A Review of Technologies and Applications

Electromagnetic Imaging of Two-Dimensional Geometries by Multipulse Interference Using the Inverse FDTD Method

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