Ultrasonic Nde Signal Classification On Steam Generator Tubes
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Ultrasonic Nde Signal Classification On Steam Generator Tubes
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Author : Rongzhi Xing
language : en
Publisher:
Release Date : 2000
Ultrasonic Nde Signal Classification On Steam Generator Tubes written by Rongzhi Xing 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 thesis presents a method for discriminating two different types of ultrasonic defect signals (cracks and deposits) collected from steam generator tubing using pulse-echo reflection techniques. The proposed method uses various signal processing and image processing techniques, such as the fast Fourier transform, deconvolution, the wavelet transform and binary morphology, to extract features from ultrasonic signals. Then several pattern recognition techniques, such as the K-mean clustering algorithm, univariate decision tree, oblique tree, and feed-forward back-propagation neural network are used to classify the flaws. Training and testing with these features results in improved performance in comparison with previous research projects concerning this data. In the feature extraction steps, a Wiener filter was used to get the impulse response of the defects. Then features from the time and frequency domains were extracted. A 1-D wavelet transform was also used to get multi-resolution representation of A-scans. Features from different decomposition levels were extracted. Image processing and binary morphology were also used to get features from 2-D images of defects. Useful features such as image area and image moments were extracted. An oblique tree and a feed-forward back-propagation neural network were shown to perform well in this project. Based on the features we obtained thus far, a feed-forward back-propagation neural network gives the best performance.
Novel Approach To The Classification Of Ultrasonic Nde Signals
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Author : Daewon Kim
language : en
Publisher:
Release Date : 200?
Novel Approach To The Classification Of Ultrasonic Nde Signals written by Daewon Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 200? with Non-destructive testing categories.
Ultrasonic inspection methods are widely used for detecting flaws in materials. The signal analysis step plays a crucial part in the data interpretation process. A number of signal processing methods have been proposed to classify ultrasonic flaw signals. One of the more popular methods involves the extraction of an appropriate set of features followed by the use of a neural network for the classification of the signals in the feature space. This thesis describes an alternative approach which uses the least mean square (LMS) method to determine the coordinates of the ultrasonic probe followed by the use of a synthetic aperture focusing technique (SAFT). The method is employed for classifying nondestructive evaluation (NDE) signals from steam generator tubes in a nuclear power plant. The movement of the probe inside the tube is modeled using spherical and cylindrical coordinate systems. The mean square error (MSE) between the model prediction and the experimentally measured distance between the probe and the tube wall is minimized using the steepest descent algorithm to obtain estimates of the probe canting angle and its location. The information is used in conjunction with the synthetic aperture focusing technique to estimate the location of the ultrasonic reflector. An alternate approach employing a model based deconvolution has been described to facilitate comparison of results. The method uses the space alternating generalized expectation maximization (SAGE) algorithm in conjunction with the Newton-Raphson method to estimate the time of flight. Results using these schemes for the classification of ultrasonic signals from cracks and deposits within steam generator tubes are presented.
Defect Classification For Steam Generator Tubes Of A Nuclear Power Plant Using Ultrasonic Nondestructive Evaluation
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Author : Aamir Masood Khan
language : en
Publisher:
Release Date : 2001
Defect Classification For Steam Generator Tubes Of A Nuclear Power Plant Using Ultrasonic Nondestructive Evaluation written by Aamir Masood Khan 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.
Due to this sizing uncertainty, conservative decisions must be made with regard to remedies resulting in premature plugging and reduced inspection cycle lengths. It has been argued in some cases that ultrasonic examination techniques could provide better sizing and characterization. In this research project, a classification system was developed that classifies the cracks from deposits formed on the steam generator tubes. Various stages involved in the entire process were 1) Pre-processing of the raw signals (B-Scans), 2) Feature extraction and selection, 3) Classifier design, and 4) testing and validation of the system performance. The available B-Scan data was pre-processed and then features were extracted by using the Discrete Wavelet Transform (DWT). Appropriately chosen DWT coefficients were then applied to a MLP neural network with back propagation learning algorithm. The results obtained were satisfactory ([Difference symbol]94% correct classification) keeping in view the limited amount of data set available for training the neural network.
Ultrasonic Nde Signal Classification With Wiener Filtering Deconvolution
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Author : Xiaoming Yu
language : en
Publisher:
Release Date : 2000
Ultrasonic Nde Signal Classification With Wiener Filtering Deconvolution written by Xiaoming Yu 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 thesis presents a method for discriminating different types of ultrasonic flaws signals collected from steam generator using pulse-echo reflection techniques. The proposed method uses various signal processing, image processing techniques to extract features from ultrasonic signals. Then several pattern recognition techniques are used to get the optimum classification results. The training and testing with these features shows that a better performance than previous effort is achieved. In ultrasonic area, it is often desired to deconvolve the impulse of transducers from the A-scans to recover the impulse response (IR) from real flaws. The duration of the deconvolved IR should be shorter than what we observe in A-scans. The longer duration in the A-scan often hides some information such as the exact location of flaw, which might make classification more difficult. To overcome this problem, Wiener filtering deconvolution technique is introduced in this project to get better resolution in time domain and get more possible features other than those from the original signals.
Automated Compensation And Classification Algorithms For Array Probe Eddy Current Nondestructive Evaluation
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Author : Pradeep Kumar Jella
language : en
Publisher:
Release Date : 2004
Automated Compensation And Classification Algorithms For Array Probe Eddy Current Nondestructive Evaluation written by Pradeep Kumar Jella and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Eddy currents (Electric) categories.
Advances In Signal Processing For Nondestructive Evaluation Of Materials
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Author : X.P. Maldague
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Advances In Signal Processing For Nondestructive Evaluation Of Materials written by X.P. Maldague 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 2012-12-06 with Technology & Engineering categories.
Non-Destructive Evaluation (NDE) is now playing an increasing role in our modern global economy; in security sensitive industries, for instance. The complexity of the inspection task and either large or limited lot runs now require more operator-assisted or fully- automated signal processing. This book deals with both fields of expertise: NDE and signal processing. On the signal processing side, in the particular context of NDE applications, the following topics are discussed: sensor fusion, signal knowledge representation, artificial intelligence, fuzzy logic, computer vision, integration of numeric and non-numeric informations, parallel decomposition, noise processing and calibration of sensor devices as well as reliability of detection. Some hardware considerations are introduced as well, to discuss platforms on which processing is done. On the NDE side, applications include advances in holographic interferometry, microwave resonance or shearography and also on more traditional NDE techniques such as ultrasonics, infrared techniques, X-ray, computed tomography, Eddy currents. Inverse problems are also discussed. This book is required reading for those who already have some experience in one or both fields (signal processing and/or NDE).
Review Of Progress In Quantitative Nondestructive Evaluation
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Author : Donald O. Thompson
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Review Of Progress In Quantitative Nondestructive Evaluation written by Donald O. Thompson 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 2012-12-06 with Technology & Engineering categories.
These Proceedings, consisting of Parts A and B, contain the edited versions of most of the papers presented at the annual Review of Progress in Quantitative Nondestructive Evaluation held at University of San Diego, San Diego, CA, on July 27 to August 1, 1997. The Review was organized by the Center for NDE at Iowa State University, in cooperation with the Ames Laboratory of the USDOE, the American Society of Nondestructive Testing, the National Institute of Standards and Technology, the Federal Aviation Administration, and the National Science Foundation IndustrylUniversity Cooperative Research Centers. This year's Review of Progress in QNDE was attended by approximately 370 participants from the US and many foreign countries who presented a total of approximately 350 papers. As usual, the meeting was divided into 36 sessions with four sessions running concurrently. The Review covered all phases of NDE research and development from fundamental investigations to engineering applications and inspection systems, and methods of inspection science from acoustics to x-rays. The Review continues to experience some fluctuations in size, mostly under pressure from a decrease in funding for NDE research at the US Federal level, but increased participation from foreign laboratories has more than made up the difference. The Review is ideally sized to permit a full-scale overview of the latest developments in a collegial atmosphere that most participants favor. The opening plenary session this year concentrated on advances in imaging technologies and methodologies that have been made in recent years. Dr. K.
Ultrasonic Testing Of Materials
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Author : Josef Krautkrämer
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Ultrasonic Testing Of Materials written by Josef Krautkrämer 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 2013-04-17 with Technology & Engineering categories.
Nondestructive testing of solid material using ultrasonic waves, for defects such as cavities, nonbonding, and strength variations, is treated in this book from the physical fundamentals of ultrasonics and materials up to the most sophisticated methods. The book is written at a level which should make it accessible to readers with some knowledge of technical mathematics. Physical laws are explained in elementary terms, and more sophisticated treatments are also indicated. After the fundamentals, instrumentation and its application is extensively reported. Tricks and observations from thirty years of experience in the field are included. The third part of the book presents test problems related to special materials or ranges of modern heavy industry, including recent applications such as those in nuclear power plants. This fourth edition features improved presentation of certain fundamental physical facts, updated reports on electronic instrumentation, and new applications in the nuclear and space industries.
Flaw Characterization For Ultrasonic Bore Side Inspection Of Steam Generator Tubes
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Author :
language : en
Publisher:
Release Date : 1976
Flaw Characterization For Ultrasonic Bore Side Inspection Of Steam Generator Tubes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Ultrasonic reflection amplitude, spectral analysis, and dynamic echo response are evaluated as methods to characterize flaws in steam generator tubes in sodium cooled reactors.
Advanced Eddy Current Test Signal Analysis For Steam Generator Tube Defect Classification And Characterization
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Author : James Patrick McClanahan
language : en
Publisher:
Release Date : 2003
Advanced Eddy Current Test Signal Analysis For Steam Generator Tube Defect Classification And Characterization written by James Patrick McClanahan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.