Related Experiment Videos
Determination of plate source, detector separation from one signal
1Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY 14853-1503, USA. sdh4@cornell.edu
Ultrasonics
|June 1, 2000
Summary
This study uses time-frequency analysis to locate transient acoustic emission sources in plates. The method accurately determines source-receiver separation by analyzing complex waveforms and Rayleigh-Lamb wave propagation.
Area of Science:
- Acoustic Emission Testing
- Wave Propagation Analysis
- Non-Destructive Evaluation
Background:
- Transient sources, like acoustic emissions, generate complex waveforms in plates.
- Understanding wave propagation is crucial for source localization.
- Dispersive nature of plate waves complicates signal analysis.
Purpose of the Study:
- To develop a method for locating transient acoustic emission sources in plates.
- To utilize time-frequency analysis for characterizing complex waveforms.
- To determine source-receiver separation from signal analysis.
Main Methods:
- Applying time-frequency analysis to detected signals.
- Generating reassigned, smoothed, pseudo-Wigner-Ville distributions.
- Analyzing signals across a range of source-receiver separations (40-180 plate thicknesses) and frequencies (10-20 Rayleigh-Lamb branches).
Main Results:
- Generated time-frequency distributions showed distinct ridges.
- These ridges corresponded to predicted frequency-time-of-arrival relations.
- Accurate determination of source-receiver separation was achieved.
Conclusions:
- Time-frequency analysis is effective for locating transient sources in plates.
- The method accurately predicts source-receiver separation using signal analysis.
- This technique enhances acoustic emission source localization capabilities.