An Application Of A Reduced Order Computational Methodology For Eddy Current Based Nondestructive Evaluation Techniques
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An Application Of A Reduced Order Computational Methodology For Eddy Current Based Nondestructive Evaluation Techniques
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Author : Michele Lynn Joyner
language : en
Publisher:
Release Date : 2001
An Application Of A Reduced Order Computational Methodology For Eddy Current Based Nondestructive Evaluation Techniques written by Michele Lynn Joyner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Keywords: Reduced order proper orthogonal decomposition method, Nondestructive evaluation, Inverse problems.
An Application Of A Reduced Order Computational Methodology For Eddy Current Based Nondestructive Evaluation Techniques
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Author :
language : en
Publisher:
Release Date : 2001
An Application Of A Reduced Order Computational Methodology For Eddy Current Based Nondestructive Evaluation Techniques written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
In the field of nondestructive evaluation, new and improved techniques are constantly being sought to facilitate the detection of hidden corrosion and flaws in structures such as airplanes and pipelines. In this dissertation, we explore the feasibility of detecting such damages by application of an eddy current based technique and reduced order modeling. We begin by developing a model for a specific eddy current method in which we make some simplifying assumptions reducing the three-dimensional problem to a two-dimensional problem. (We do this for proof-of-concept.) Theoretical results are then presented which establish the existence and uniqueness of solutions as well as continuous dependence of the solution on the parameters which represent the damage. We further discuss theoretical issues concerning the least squares parameter estimation problem used in identifying the geometry of the damage. To solve the identification problem, an optimization algorithm is employed which requires solving the forward problem numerous times. To implement these methods in a practical setting, the forward algorithm must be solved with extremely fast and accurate solution methods. Therefore in constructing these computational methods, we employ reduced order Proper Orthogonal Decomposition (POD) techniques which allows one to create a set of basis elements spanning a data set consisting of either numerical simulations or experimental data. We investigate two different approaches in forming the POD approximation, a POD/Galerkin technique and a POD/Interpolation technique. We examine the error in the approximation using one approach versus the other as well as present results of the parameter estimation problem for both techniques. Finally, results of the parameter estimation problem are given using both simulated data with relative noise added as well as experimental data obtained using a giant magnetoresistive (GMR) sensor. The experimental results are based on successfully using act.
Nondestructive Evaluation Using A Reduced Order Computational Methodology
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Author : Michele L. Joyner
language : en
Publisher:
Release Date : 2000
Nondestructive Evaluation Using A Reduced Order Computational Methodology written by Michele L. Joyner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
This paper uses eddy current based techniques and reduced order modeling to explore the feasibility of detecting a subsurface damage in structures such as air foils and pipelines. To identify the geometry of a damage, an optimization algorithm is employed which requires solving the forward problem numerous times. To implement these methods in a practical setting, the forward algorithm must be solved with extremely fast and accurate solution methods. Therefore, our computational methods are based on the reduced order Karhunen-Loeve or Proper Orthogonal Decomposition (POD) techniques. For proof-of-concept, we implement the methodology on a 2-D problem and find the methods to be efficient and robust even with data containing 10% relative noise. Furthermore, the methods are fast; our findings suggest we can reduce the computational time on average by a factor of 3000.
Eddy Current Nondestructive Evaluation
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Author : Nicola Bowler
language : en
Publisher: Springer
Release Date : 2019-08-01
Eddy Current Nondestructive Evaluation written by Nicola Bowler and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-01 with Technology & Engineering categories.
This book covers the topic of eddy current nondestructive evaluation, the most commonly practiced method of electromagnetic nondestructive evaluation (NDE). It emphasizes a clear presentation of the concepts, laws and relationships of electricity and magnetism upon which eddy current inspection methods are founded. The chapters include material on signals obtained using many common eddy current probe types in various testing environments. Introductory mathematical and physical concepts in electromagnetism are introduced in sufficient detail and summarized in the Appendices for easy reference. Worked examples and simple calculations that can be done by hand are distributed throughout the text. These and more complex end-of-chapter examples and assignments are designed to impart a working knowledge of the connection between electromagnetic theory and the practical measurements described. The book is intended to equip readers with sufficient knowledge to optimize routine eddy current NDE inspections, or design new ones. It is useful for graduate engineers and scientists seeking a deeper understanding of electromagnetic methods of NDE than can be found in a guide for practitioners.
Electromagnetic Nondestructive Evaluation Iv
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Author : Satish S. Udpa
language : en
Publisher: IOS Press
Release Date : 2000
Electromagnetic Nondestructive Evaluation Iv written by Satish S. Udpa and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Science categories.
A description of the state of the art in electromagnetic nondestructive evaluation (NDE) techniques. Topics covered range from magnetostatic to eddy current and microwave NDE methods. Advances in materials characterization, forward/simulation models, sensor design and inverse methodologies are discussed. The book also includes contributions on benchmark problems and solutions.
Electromagnetic Nondestructive Evaluation Vi
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Author : Fumio Kojima
language : en
Publisher: IOS Press
Release Date : 2002
Electromagnetic Nondestructive Evaluation Vi written by Fumio Kojima and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Science categories.
This work is a collection of papers on electromagnetic nondestructive evaluation. It discusses developments in the growing field of electromagnetic nondestructive evaluation methods. Topics include evaluation of degradation mechanism in magnetic materials.
Electromagnetic Nondestructive Evaluation Xii
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Author : Young-Kil Shin
language : en
Publisher: IOS Press
Release Date : 2009
Electromagnetic Nondestructive Evaluation Xii written by Young-Kil Shin and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Science categories.
"The 13th International Workshop on Electromagnetic Nondestructive Evaluation (ENDE) was held at the Seoul Education and Cultural Center, Seoul, Korea from June 10 through 12, 2008."--P. v.
Real Time Computational Algorithms For Eddy Current Based Damage Detection
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Author :
language : en
Publisher:
Release Date : 2001
Real Time Computational Algorithms For Eddy Current Based Damage Detection written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
In the field of nondestructive evaluation, new and improved techniques are constantly being sought to facilitate the detection of hidden corrosion arid flaws in structures such as airplanes and pipelines. In this paper we explore the feasibility of detecting such damages by application of an eddy current based technique coupled with reduced order modeling. We begin by developing a model for a specific eddy current method in which we make some simplifying assumptions reducing the three-dimensional problem to a two-dimensional problem. (We do this for proof-of-concept.) Theoretical results are then presented which establish tile existence and uniqueness of solutions as well as continuous dependence of the solutions on the parameters which represent the damage. We further discuss theoretical issues concerning the least squares parameter estimation problem used in identifying the geometry of the damage. To solve the identification problem an optimization algorithm is employed which requires solving the forward problem numerous times. To implement these methods in a practical setting the forward algorithm must be solved with extremely fast arid accurate solution methods. In constructing these computational methods, we employ reduced order Proper Orthogonal Decomposition (POD) techniques. This approach permits one to create a set of basis elements spanning a data set consisting of either numerical siumlations or experimental data. We discuss two different algorithms for forming the POD approximations, a POD/Galerkin technique and a POD/Interpolation technique. Finally, results of the inverse problem associated with damage detection are given using both simulated data with relative noise added as well as experimental data obtained using a giant magnetoresistive (GMR) sensor.
Computational Electromagnetics And Model Based Inversion
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Author : Harold A Sabbagh
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-22
Computational Electromagnetics And Model Based Inversion written by Harold A Sabbagh and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-22 with Technology & Engineering categories.
This volume will define the direction of eddy-current technology in nondestructive evaluation (NDE) in the twenty-first century. It describes the natural marriage of the computer to eddy-current NDE, and its publication was encouraged by favorable responses from workers in the nuclear-power and aerospace industries. It will be used by advanced students and practitioners in the fields of computational electromagnetics, electromagnetic inverse-scattering theory, nondestructive evaluation, materials evaluation and biomedical imaging, among others, and will be based on our experience in applying the subject of computational electromagnetics to these areas, as manifested by our recent research and publications. Finally, it will be a reference to future monographs on advanced NDE that are being contemplated by our colleagues and others. Its importance lies in the fact that it will be the first book to show that advanced computational methods can be used to solve practical, but difficult, problems in eddy-current NDE. In fact, in many cases these methods are the only things available for solving the problems. The book will cover the topic of computational electromagnetics in eddy-current nondestructive evaluation (NDE) by emphasizing three distinct topics: (a) fundamental mathematical principles of volume-integral equations as a subset of computational electromagnetics, (b) mathematical algorithms applied to signal-processing and inverse scattering problems, and (c) applications of these two topics to problems in which real and model data are used. This will make the book more than an academic exercise; we expect it to be valuable to users of eddy-current NDE technology in industries as varied as nuclear power, aerospace, materials characterization and biomedical imaging. We know of no other book on the market that covers this material in the manner in which we will present it, nor are there any books, to our knowledge, that apply this material to actual test situations that are of importance to the industries cited. It will be the first book to actually define the modern technology of eddy-current NDE, by showing how mathematics and the computer will solve problems more effectively than current analog practice.
Electromagnetic Nondestructive Evaluation Vii
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Author : Gerd Dobmann
language : en
Publisher: IOS Press
Release Date : 2006
Electromagnetic Nondestructive Evaluation Vii written by Gerd Dobmann and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
The aim of this selection of papers is to bring together researchers working very deep in the basics of electromagnetic NDT on one hand and industrialist discussing their practical problems on the other hand. The papers cover topics as; Microwave applications and Material Characterization; General Eddy Current Inspection Tasks; Novel Techniques and Sensors; Magnetic Flux leakage Inspection; Steam Generator Eddy Current Inspection Tasks; and Material Characterization. Especially Novel Techniques and Sensors and Material Characterization are discussed on multiple papers. This publication gives a good overview of the many scientific problems in this area, but also explains the actual challenges for the scientific-technical community, like problems with in-line inspection of pipelines or the enhancing of the inspection performance in steam generator tubes inspection in the nuclear field. The material is important for scientists and engineers working in the field of electromagnetic non-destructive testing, in defect detection and sizing, as well as in material characterization.