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1. Effects of Noise on Lamb-Mode Acoustic-Emission Arrival Times Determined by Wavelet Transform
Published: 12/1/2005
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher
Abstract: Precise AE signal arrival times of the fundamental Lamb modes can be obtained from the arrival time of the peak wavelet transform (WT) magnitude at a particular frequency of interest. Since these arrival times are not determined from a fixed threshol ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50139

2. Acoustic Emission Source Location in a Thick Steel Plate Using Lamb Modes
Published: 1/1/2007
Author: Marvin Arnold Hamstad
Abstract: Using a validated finite-element modeling code, buried out-of-plane (two dimensional code (2D)) and in-plane (three dimensional code (3D)) acoustic emission (AE) dipole point sources were operated at different depths below the top surface of a 25.4 m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50646

3. Comparison of Wavelet Transform and Choi-Williams Distribution to Determine Group Velocities for Different Acoustic Emission Sensors
Published: 12/31/2008
Author: Marvin Arnold Hamstad
Abstract: Acoustic emission (AE) sources in a plate generate dispersive Lamb waves. In this research, pencil lead breaks (PLBs) were made on an edge of a 3.1 mm thick aluminum alloy plate to generate such AE waves. The PLBs were made near the plate midplane an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901059

4. Detectability of Slow Crack Growth in Bridge Seels by Acoustic Emission
Published: 12/1/1998
Authors: Marvin Arnold Hamstad, Joseph David McColskey
Abstract: The detectabillity of slow crack growth of cracks in bridge steels has been studied by use of acoustic emission testing technology. Fatigue crack-growth rates of nominally 1x10^u-4^ mm/cycle (4x10^U-6^ in./cycle) and 1x10^u-3^ mm/cycle (4x10-5 in/c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851225

5. Development of Practical Wideband High-Fidelity Acoustic Emission Sensors
Published: 6/1/1995
Author: Marvin Arnold Hamstad
Abstract: The development of a series of wideband acoustic emission (AE) sensor/preamplifier systems is described. Key design factors are discussed along with the actual design and characterization of the sensors. These new sensors with integral amplificatio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851313

6. Effects of Lateral Plate Dimensions on Acoustic Emission Signals From Dipole Sources
Published: 12/1/2001
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: Using a validated three-dimensional finite element code, the out-of-plane displacements corresponding to model sources of acoustic emission (AE) were calculated in aluminum plate samples of two different lateral dimensions. Both samples were 4.7 mm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851235

7. Examination of the Application of a Wavelet Transformation to Acoustic Emission Signals: Part 2. Source Location
Published: 1/1/2002
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: In Part 2, (Part 1 Source Identification) the same finite-element-generated database of acoustic emission (AE) signals was used to examine the application of a wavelet transform (WT) to improve the accuracy of AE source location. The method utilizes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851302

8. Examination of the Application of a Wavelet Transformation to Acoustic Emission Signals: part 1. Source Identification
Published: 1/1/2002
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: A database of wideband acoustic emission (AE) modeled signals was used in Part 1 to examine the application of a wavelet transform (WT) to accomplish identification of AE sources. The AE signals in the database were created by use of a validted thre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851301

9. Finite Element and Plate Theory Methods for Modeling Acoustic Emission Waveforms
Published: 10/1/2002
Authors: W H Prosser, Marvin Arnold Hamstad, John M. Gary, Agnes O'Gallagher
Abstract: A comparison was made between two approaches to predict acoustic emission waveforms in thin plates. A normal mode solution method for Mindlin plate theory was used to predict the flexural plate mode response to a point source, step-function load, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851190

10. Modal-based identification of acoustic emission sources in the presence of electronic noise
Published: 12/1/2004
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher
Abstract: Based on the results of an earlier study, a specific scheme was demonstrated to identify acoustic emission (AE) source types using ratios of Lamb-wave modal amplitudes from two radiation directions in a 4.7 mm thick aluminum plate. The modal amplitud ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50017



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