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Automated structural integrity monitoring based on broadband lamb wave excitation and matched filtering

AIAA Paper 2003-1563
: Kehlenbach, M.; Hanselka, H.

American Institute of Aeronautics and Astronautics -AIAA-, Washington/D.C.:
44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 11th AIAA/ASME/AHS Adaptive Structures Forum, 5th AIAA Non-Deterministic Approaches Forum, 4th AIAA Gossamer Spacecraft Forum, AIAA Dynamics Specialists Conference 2003. A collection of technical papers : Norfolk, Virginia, 7 - 10 April 2003
Reston, Va.: American Institute of Aeronautics and Astronautics, 2003
ISBN: 1-563-47625-8
Structures, Structural Dynamics and Materials Conference <44, 2003, Norfolk/Va.>
Conference Paper
Fraunhofer LBF ()
structure; aeronautics; filtering; material

This paper discusses a structural health monitoring procedure for locating damage in plate-like structures. The concept is based on the propagation of Lamb waves which are excited and received by surface-mounted piezoelectric transducers. In an initial approach, narrowband burst signals can be used to excite the Lamb waves. This methodology is very widespread in the literature and has been adapted in most papers. However, noise, dispersion, and multiple reflections caused by damage make signal analysis very complex in this case. A new excitation and signal processing method is proposed here. This method is based on broadband excitation in conjunction with matched filtering, a method which is very common in radar technology. It can be used to enhance the signal-to-noise ratio and makes the test method more stable and reliable. After a short description of the basic idea of this method experimental results are described that confirm this approach.