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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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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, ...

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 ...

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