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Acoustic techniques for structural health monitoring

: Frankenstein, B.; Augustin, J.; Hentschel, D.; Schubert, F.; Köhler, B.; Meyendorf, N.


Thompson, D.O.:
Review of progress in quantitative nondestructive evaluation. Vol. 27B : The 34th Annual Review of Progress in Quantitative NDE. Golden, Colorado, 22 - 27 July 2007
Melville, NY: AIP, 2008 (AIP Conference Proceedings 975,B)
ISBN: 978-0-7354-0494-6
Annual Review of Progress in Quantitative Nondestructive Evaluation (NDE) <34, 2007, Golden/Colo.>
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Future safety and maintenance strategies for industrial components and vehicles are based on combinations of monitoring systems that are permanently attached to or embedded in the structure, and periodic inspections. The latter belongs to conventional nondestructive evaluation (NDE) and can be enhanced or partially replaced by structural health monitoring systems. However, the main benefit of this technology for the future will consist of systems that can be differently designed based on improved safety philosophies, including continuous monitoring. This approach will increase the efficiency of inspection procedures at reduced inspection times. The Fraunhofer IZFP Dresden Branch has developed network nodes, miniaturized transmitter and receiver systems for active and passive acoustical techniques and sensor systems that can be attached to or embedded into components or structures. These systems have been used to demonstrate intelligent sensor networks for the monitoring of aerospace structures, railway systems, wind energy generators, piping system and other components. Material discontinuities and flaws have been detected and monitored during full scale fatigue testing. This paper will discuss opportunities and future trends in nondestructive evaluation and health monitoring based on new sensor principles and advanced microelectronics. It will outline various application examples of monitoring systems based on acoustic techniques and will indicate further needs for research and development.