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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Utilising of position profiles for location of continuous acoustic emission sources
 Chlada, Milan ; Převorovský, Zdeněk ; Sladký, Petr
By detecting of continuous acoustic emission (AE) sources it is possible to precede potential emergencies as e.g. leaks of the media from pressure vessels, pipelines etc. Present location methods using attenuation characteristics of elastic waves have certain application restrictions. These disadvantages can be solved by introduction of so called position profiles. In this way, the attenuation dependencies of AE wave amplitude and the distance from emission source are converted to the dependencies between position profiles and Root Mean Square (RMS) of captured voltage signals of continuous AE. Proper location of real AE source is done by comparing of position profiles corresponding to model virtual sources with the position profile computed for a real source, while it is possible to apply optimization comparative methods or artificial neural networks. The paper presents detailed derivation and description of the new method, which is a subject of patent pending.
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Location of acoustic emission sources in geometrically sparce structures
 Chlada, Milan ; Převorovský, Zdeněk
In recent years, the importance of modern philosophy of Structural Health Monitoring (SHM) is increasing. SHM systems are gradually integrated into, e.g., aircraft or bridge structures and also become newly a part of certain modern buildings, where the break down would cause significant material or human losses. One of the effective prewarning methods is the detection of acoustic emission (AE). The paper yields the discussion about the utilization of artificial neural networks in comparison with the segment location based on the chronology of signal arrivals to selected groups of AE sensors for “geometrically sparse” structures. Both methods and their results are demonstrated in case of experiment with gradual loading of a part of a roof construction until the final breakdown.
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