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Pulse analysis of acoustic emission signals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Packman, P. F. Houghton, J. R. |
| Copyright Year | 1977 |
| Description | A method for the signature analysis of pulses in the frequency domain and the time domain is presented. Fourier spectrum, Fourier transfer function, shock spectrum and shock spectrum ratio were examined in the frequency domain analysis, and pulse shape deconvolution was developed for use in the time domain analysis. Comparisons of the relative performance of each analysis technique are made for the characterization of acoustic emission pulses recorded by a measuring system. To demonstrate the relative sensitivity of each of the methods to small changes in the pulse shape, signatures of computer modeled systems with analytical pulses are presented. Optimization techniques are developed and used to indicate the best design parameters values for deconvolution of the pulse shape. Several experiments are presented that test the pulse signature analysis methods on different acoustic emission sources. These include acoustic emissions associated with: (1) crack propagation, (2) ball dropping on a plate, (3) spark discharge and (4) defective and good ball bearings. Deconvolution of the first few micro-seconds of the pulse train are shown to be the region in which the significant signatures of the acoustic emission event are to be found. |
| File Size | 5409881 |
| Page Count | 183 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770017962 |
| Archival Resource Key | ark:/13960/t16m81s78 |
| Language | English |
| Publisher Date | 1977-02-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Nondestructive Tests Fourier Transformation Pulsed Radiation Ball Bearings Acoustic Emission Frequencies Signature Analysis Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
