Riveted connections are present on aircraft structures in various realisations. Most of the riveted joints have to be inspected in frequent intervals. To detect cracks, a low frequency eddy current inspection using sliding probes is a commonly used method. Typically a single frequency method is applied. Investigations using a multifrequency system have shown better results in detection of small cracks. For this reason a custom designed system for rivetrow inspections is being applied to the full-scale structure test of the Airbus A380. It uses the four frequency technique with a standard sliding probe. The automatic online analysis counts the signals from the rivets and marks signals exceeding a threshold as defect. One frequency is used to fulfil the requirements of the Nondestructive Testing Manuals (NTM). Additionally the analysis algorithm uses information from the other frequency channels to identify small cracks, whose signals are below the threshold. A specially designed data structure allows easy archive and identification of the data. An automatic adjustment procedure helps to setup the system. For detailed investigations the recorded signal traces can be analysed later in the office.
Multifrequency eddy current inspection of rivetrows on aircraft structures
Mehrfrequenz-Wirbelstromprüfung von Nietverbindungen in Luftfahrtkomponenten
2006
7 Seiten, 6 Bilder, 5 Quellen
Conference paper
Storage medium
English
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