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You searched on: Author: marvin hamstad

Displaying records 11 to 20 of 21 records.
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11. Practical Aspects of Acoustic Emission Source Location by a Wavelet Transform
Published: 1/1/2003
Authors: Marvin Arnold Hamstad, K S Downs, Agnes O'Gallagher
Abstract: An algoithmic approach to improve the accuracy of AE source location was demonstrated by using a large database of wideband-acoustic-emission-(AE)-modeled signals and wavelet transform (WT) results. The AE-signal database was created by a three-dime ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851335

12. Wavelet Transform Signal Processing to Distinguish Different Acoustic Emisson Sources
Published: 1/1/2003
Authors: K S Downs, Marvin Arnold Hamstad, E P Baars
Abstract: A database of wideband acoustic emission (AE) modeled signals were used to continue to examine the use of wavelet transform (WT) results to accomplish identification of AE sources. The AE signals in the database were created by use of a validated thr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851337

13. 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

14. Reflections of AE Waves in Finite Plates: Finite Element Modeling and Experimental Measurements
Published: 10/1/2002
Authors: W H Prosser, Marvin Arnold Hamstad, John M. Gary, Agnes O'Gallagher
Abstract: We investigated the capability of a three-dimentional dynamic finite element method for predicting far-field acoustic emission (AE) signals in thin plates of finite lateral extent, including their reflections from the plate edges. A lead-break (Hsu- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851186

15. 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

16. 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

17. 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

18. Modeling of Buried Monopole and Dipole Sources of Acoustic Emission With a Finite Element Technique
Published: 12/1/1999
Authors: Marvin Arnold Hamstad, Agnes O'Gallagher, John M. Gary
Abstract: The requirements for dynamic finite element modeling of the source dynamics and wave propagation of buried acoustic emission point sources were examined. Maximum permissible source and cell sizes for point sources were determined as a function of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851256

19. 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

20. Wideband Acoustic Emission Displacement Signals as a Function of Source Rise-Time and Plate Thickness
Published: 8/1/1998
Authors: Marvin Arnold Hamstad, John M. Gary, Agnes O'Gallagher
Abstract: Using a dynamic finite element model, we studied the interrelationships between acoustic source rise-time and plate thickness in steel plates. The source was typically a midplane vertical dipole, and the out-of-plane displacement was obtained in the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851187



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