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Analysis Method for Guided Wave Propagation Direction in Anisotropic Structures

Szewieczek, Artur and Sinapius, Michael (2016) Analysis Method for Guided Wave Propagation Direction in Anisotropic Structures. In: International Conference on Innovation in European Aeronautics Research. 6th International Conference on Innovation in European Aeronautics Research, 18.-21. Okt., Porto, Portugal.

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Official URL: https://easnconference.eu/


Guided waves, such as Lamb waves, enable a Structural Health Monitoring (SHM) of modern composite structures. However, due to the complex wave propagation different scanning and imaging methods were developed in the past. They enable a better understanding of the wave interaction with complex structures. Beyond video animations of the wave propagation advanced analysis methods are possible. A promising application is the virtual design and optimization of sensors and sensor networks based on acquired measurements. In this technique a piezoelectric transducer is used for guided wave excitation in a specimen. An air-coupled ultrasonic sensor is moved across the specimen surface. For every scanning point the received signal is recorded. After this, a compensation of the wave radiation through the air gap combined with a model of the investigated specimen is used to reconstruct its dynamic surface deformation. The deformation is applied to a numerical model of a virtual sensor which delivers the response signal. In this way an optimal dimensioning of sensors in number, position, form and material properties can be developed for SHM sensor networks. Applications like this require knowledge of the propagation direction of every guided wave mode within a wave field. The actuator position cannot be used exclusively because mode conversion may occur on any position. This paper presents a method for propagation direction evaluation based on acquired measurement data. In combination with a mechanical model of the structure anisotropic propagation is utilised for accuracy improvement. The results are calculated in the time domain and contain a specific time window for any identified wave mode. The presented method can be used for advanced applications of guided wave analysis.

Item URL in elib:https://elib.dlr.de/107775/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis Method for Guided Wave Propagation Direction in Anisotropic Structures
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Szewieczek, Arturdlr-fa-mwUNSPECIFIED
Sinapius, Michaeltu braunschweig / dlr braunschweigUNSPECIFIED
Date:October 2016
Journal or Publication Title:International Conference on Innovation in European Aeronautics Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:structural health monitoring, sensor design, virtual sensors, guided waves, lamb waves, wave analysis
Event Title:6th International Conference on Innovation in European Aeronautics Research
Event Location:Porto, Portugal
Event Type:international Conference
Event Dates:18.-21. Okt.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Szewieczek, Artur
Deposited On:12 Dec 2016 08:44
Last Modified:12 Dec 2016 08:44

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