Probability of Detection (POD) for Nondestructive Evaluation (NDE)
Author: George A. Matzkanin
Publisher:
Published: 2001-08
Total Pages:
ISBN-13: 9781890596200
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Probability of Detection (POD) Analysis for the Advanced Retirement for Cause (RFC)/Engine Structural Integrity Program (ENSIP) Nondestructive Evaluation (NDE) System Development. Volume 2: User's Manual
Author:
Publisher:
Published: 2000
Total Pages: 33
ISBN-13:
DOWNLOAD EBOOKThis is a general overview of POD Version 3 usage with emphasis on the input sheets for a POD analysis. The manual also contains the explanations of the output tables and graphs. The input and output sheets are standard Excel workbook sheets. All standard Excel 97 commands can be used at the discretion of the user. Knowledge of Excel is assumed and no Excel commands are discussed. It is a C++ program that interacts with a Microsoft Excel 97 workbook to perform POD analysis on the results of an NDE capability demonstration. The interface between the user and POD is the Excel Workbook. POD controls the analysis through a window that opens and closes workbooks, calls for the recalculations using the analysis and data specified on the input sheets of the workbook, and executes Excel macros that produce the output of the analysis. POD names, uses, and controls a maximum of 11 sheets of the workbook. Two of these sheets contain the input information for an analysis and the other nine contain analysis output in the form of tables and graphs.
Probability of Detection (POD) Analysis for the Advanced Retirement for Cause (RFC)/Engine Structural Integrity Program (ENSIP) Nondestructive Evaluation (NDE) System-Volume 3: Material Correlation Study
Author:
Publisher:
Published: 2000
Total Pages: 28
ISBN-13:
DOWNLOAD EBOOKThis is the third volume of a technical report prepared by the University of Dayton Research Institute for the Materials and Manufacturing Directorate (ML) of the Air Force Research Laboratory (AFRL), Wright-Patterson Air Force Base, Ohio. The final report of this work comprises three volumes. Volume 1 presents a description of changes made to the probability of detection (POD) analysis program of Mil-STD-1823 and the statistical evaluation of modifications that were made to version 3 of the Eddy Current Inspection System (ECIS v3). Volume 2 contains the Users Manual for the version 3 update of the POD program. The results of a separate study for predicting POD from specimens of like geometry and materials are presented in Volume 3. In the current environment of restricted budgets, aircraft components are often used beyond their design life. In order to avoid the large cost of replacing critical rotating parts as they reach their "safe-life" limits, a Retirement For Cause (RCF) program was implemented. The RFC program involves periodic nondestructive evaluation (NDF) inspections to assess the damage-state of components. Components with no detectable cracks are returned to service and those with detected cracks are discarded before they can cause an incident. This process allows parts with high life to be used to their full potential. The Air Force has embraced RFC and currently uses it to successfully manage component life for several of their gas turbine engines.
Guidebook for Assessing Similarity and Implementing Empirical Transfer Functions for Probability of Detection (POD) Demonstrations for Signal Based Nondestructive Evaluation (NDE) Methods
Author: Ajay Koshti
Publisher:
Published: 2022
Total Pages: 50
ISBN-13:
DOWNLOAD EBOOKProbability of Detection (POD) Analysis for the Advanced Retirement for Cause (RFC)/Engine Structural Integrity Program (ENSIP) Nondestructive Evaluation (NDE) System-Volume 1: Pod Analysis
Author:
Publisher:
Published: 2000
Total Pages: 99
ISBN-13:
DOWNLOAD EBOOKIn 1995, the U.S. Air Force initiated a multifaceted program to upgrade the ECIS. Planned changes to the ECIS include updating a) the eddy current instrument, b) the station computer and its operating system, and c) the robotics controller. These system changes were to be "drop-in" to avoid the costs of repeating a complete capability demonstration program for ongoing engine inspections. In addition, a new approach to calibration was demonstrated, and a new POD computer program was written for the analysis of data from capability demonstrations. This report presents the results of the study whose objectives were updating the POD analysis program and evaluating the data collected to demonstrate the drop-in compatibility of the upgraded and original ECISs. An additional task was later added to analyze data from an experiment designed to validate two proposed methods for inferring the POD of a geometry material combination using inspection results from other geometry/material combinations. While the primary focus of this study was POD analysis for the kFC/ENSIP application with its highly automated ECIS, the POD analysis methods are applicable to a broad range of nondestructive evaluation (NDE) systems. Accordingly, the report discusses POD analyses in this broader context.
Nondestructive Evaluation (NDE) Capabilities Data Book (3rd Edition).
Author:
Publisher:
Published: 1997
Total Pages: 598
ISBN-13:
DOWNLOAD EBOOKThis Data Book consolidates and organizes available reference data for demonstrated NDE performance capabilities into a single source. Guidelines are presented for selecting options for use of NDE and for assessing the potential to meet design requirements (critical flaw detection requirements). Guidelines for demonstration of specific NDE process capabilities are also presented. Following a 65 page text (7 chapters) describing various aspects of NDE capabilities quantification, probability of detection (POD), and damage tolerance concepts, 423 POD curves are organized and presented in a series of Appendices organized by NDE method. A documentation page precedes each dataset and provides a condensed description of the test object, test artifact and data collection conditions follow the documentation page. POD data are generally presented as a function of crack length. For selected datasets, POD data are also presented as a function of crack depth and crack depth-to-thickness ratio. POD curves are based on hit/miss data using the log-logistic model. Original reference source information is provided for each dataset.
Probability of Detection Models for Eddy Current NDE Methods
Author:
Publisher:
Published: 1993
Total Pages: 106
ISBN-13:
DOWNLOAD EBOOKThe development of probability of detection (POD) models for a variety of nondestructive evaluation (NDE) methods is motivated by a desire to quantify the variability introduced during the process of testing. Sources of variability involved in eddy current methods of NDE include those caused by variations in liftoff, material properties, probe canting angle, scan format, surface roughness and measurement noise. This thesis presents a comprehensive POD model for eddy current NDE. Eddy current methods of nondestructive testing are used widely in industry to inspect a variety of nonferromagnetic and ferromagnetic materials. The development of a comprehensive POD model is therefore of significant importance. The model incorporates several sources of variability characterized by a multivariate Gaussian distribution and employs finite element analysis to predict the signal distribution. The method of mixtures is then used for estimating optimal threshold values. The research demonstrates the use of a finite element model within a probabilistic framework to the spread in the measured signal for eddy current nondestructive methods. Using the signal distributions for various flaw sizes the POD curves for varying defect parameters have been computed. In contrast to experimental POD models, the cost of generating such curves is very low and complex defect shapes can be handled very easily. The results are also operator independent.
Directed Design of Experiments for Validating Probability of Detection Capability of Nde Systems (Doepod)
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-05-23
Total Pages: 86
ISBN-13: 9781719508506
DOWNLOAD EBOOKDirected Design of Experiments for Validating Probability of Detection Capability of NDE Systems (DOEPOD) Manual v.1.2 The capability of an inspection system is established by applications of various methodologies to determine the probability of detection (POD). One accepted metric of an adequate inspection system is that there is 95% confidence that the POD is greater than 90% (90/95 POD). Design of experiments for validating probability of detection capability of nondestructive evaluation (NDE) systems (DOEPOD) is a methodology that is implemented via software to serve as a diagnostic tool providing detailed analysis of POD test data, guidance on establishing data distribution requirements, and resolving test issues. DOEPOD demands utilization of observance of occurrences. The DOEPOD capability has been developed to provide an efficient and accurate methodology that yields observed POD and confidence bounds for both Hit-Miss or signal amplitude testing. DOEPOD does not assume prescribed POD logarithmic or similar functions with assumed adequacy over a wide range of flaw sizes and inspection system technologies, so that multi-parameter curve fitting or model optimization approaches to generate a POD curve are not required. DOEPOD applications for supporting inspector qualifications is included. Generazio, Edward R. Langley Research Center EXPERIMENT DESIGN; PROBABILITY THEORY; DETECTION; INSPECTION; NONDESTRUCTIVE TESTS; MANUALS; BINOMIALS; LIKELIHOOD RATIO
Electromagnetic Nondestructive Evaluation XXII
Author: A. Tamburrino
Publisher: IOS Press
Published: 2019-12-11
Total Pages: 142
ISBN-13: 1643680412
DOWNLOAD EBOOKThe use of electromagnetic nondestructive evaluation has grown significantly in recent years. This valuable technique enables the assessment of objects by observing the electromagnetic response to electric currents and/or magnetic fields introduced within them. This book presents the proceedings of the 23rd International Workshop on Electromagnetic Nondestructive Evaluation (ENDE2018), held in Detroit, Michigan, USA, from 9 - 13 September 2018. The workshop provides an international forum for the exchange of information on state-of-the-art technologies and development in electromagnetic nondestructive evaluation, and the 19 papers presented here cover topics including sensors; modeling; signal processing; inverse problems; materials state awareness and characterization; damage diagnosis and prognosis; biomedical applications; and innovative industrial applications of eNDE. Providing a comprehensive overview of current theoretical and applied research into electromagnetic nondestructive evaluation (eNDE) methods, the book will be of interest to all those whose work involves the non-destructive evaluation of objects, whatever their field.
Practical Non-destructive Testing
Author: Baldev Raj
Publisher: Woodhead Publishing
Published: 2002
Total Pages: 202
ISBN-13: 9781855736009
DOWNLOAD EBOOKThis comprehensive book covers the five major NDT methods - liquid penetrants, eddy currents, magnetic particles, radiography and ultrasonics in detail and also considers newer methods such as acoustic emission and thermography and discusses their role in on-line monitoring of plant components. Analytical techniques such as reliability studies and statistical quality control are considered in terms of their ability to reduce inspection costs and limit down time. A useful chapter provides practical guidance on selecting the right method for a given situation.
