SHM using Guided Waves-Recent Activities and Advances in Germany

Mueller, Inka; Moll, Jochen; Tschöke, Kilian; Prager, Jens; Kexel, Christian; Schubert, Lars; Lugovtsova, Yevgeniya; Bach, Martin; Vogt, Thomas

doi:10.12783/shm2019/32187

Cited by 4 publications

(4 citation statements)

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“…Instead of taking the direct time signal, here, the Hilbert transform of the time signal was chosen to decrease the effect of small phase shifts. The effect of this procedure has been shown in [ 1 ].…”

Section: Analysis: Damage Detectionmentioning

confidence: 99%

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Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

Golub

Shpak

Mueller

et al. 2021

Sensors

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Since stringers are often applied in engineering constructions to improve thin-walled structures’ strength, methods for damage detection at the joints between the stringer and the thin-walled structure are necessary. A 2D mathematical model was employed to simulate Lamb wave excitation and sensing via rectangular piezoelectric-wafer active transducers mounted on the surface of an elastic plate with rectangular surface-bonded obstacles (stiffeners) with interface defects. The results of a 2D simulation using the finite element method and the semi-analytical hybrid approach were validated experimentally using laser Doppler vibrometry for fully bonded and semi-debonded rectangular obstacles. A numerical analysis of fundamental Lamb wave scattering via rectangular stiffeners in different bonding states is presented. Two kinds of interfacial defects between the stiffener and the plate are considered: the partial degradation of the adhesive at the interface and an open crack. Damage indices calculated using the data obtained from a sensor are analyzed numerically. The choice of an input impulse function applied at the piezoelectric actuator is discussed from the perspective of the development of guided-wave-based structural health monitoring techniques for damage detection.

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Section: Analysis: Damage Detectionmentioning

confidence: 99%

“…Metals are still among the most popular construction materials, and metallic plate- or shell-type components are widely employed for buildings, pipelines, bridges, etc. [ 1 , 2 , 3 ]. After long-term service, defects may appear in metallic engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

Golub

Shpak

Mueller

et al. 2021

Sensors

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“…Its size is motivated by the projected surface of real impacts. The reference damage has been placed at different locations on the structure in order to study spatially distributed probability of detection (POD) of GW-based SHM-systems [22].…”

Section: Introductionmentioning

confidence: 99%

Guided Waves for Damage Detection in Complex Composite Structures: The Influence of Omega Stringer and Different Reference Damage Size

et al. 2020

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The third dataset dedicated to the Open Guided Waves platform aims at carbon fiber composite plates with an additional omega stringer at constant temperature conditions. The two structures used in this work are representative for real aircraft components. Comprehensive measurements were recorded in order to study (I) the impact of the omega stringer on guided wave propagation, and (II) elliptical reference damages of different sizes located at three separate positions on the structure. Measurements were recorded for narrowband excitation (5-cycle toneburst with varying carrier frequencies) and broadband excitation (using chirp waveforms). The paper presents the results of a technical validation including numerical modelling, and enables further research, for example related to probability of detection (POD) analysis.

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“…These are the two main motivation for evaluating MIMO. The evaluation concentrates on a metal structural component, because metallic parts are of eminent relevance in the field of non-destructive evaluation and thus also of SHM [29]. Further experiments are presented from a composite panel as a complex and also practically relevant structure.…”

Section: Introductionmentioning

confidence: 99%