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Design of mode selective actuators for Lamb wave excitation in composite plates

Schmidt, Daniel and Sinapius, Michael and Wierach, Peter (2013) Design of mode selective actuators for Lamb wave excitation in composite plates. CEAS Aeronautical Journal, Vol. 3, pp. 1-8. Springer. doi: 10.1007/s13272-012-0059-3. ISSN 1869-5590.

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Structural Health Monitoring based on Lamb waves, a type of ultrasonic guided waves, is a promising method for in-service inspection of composite structures. In this study, mode selective actuators are developed to excite a particular Lamb wave mode in quasi-isotropic CFRP (carbon fibre-reinforced polymer) plates. Different manufacturing technologies based on monolithic piezoceramics and piezocomposites are described. The actuators are based on interdigital transducer design in order to control the frequency as well as the wavelength of the desired mode within the excitation. To determine the wavelength of the desired Lamb wave mode, experimental dispersion diagrams of the CFRP plates are measured using air-coupled ultrasonic scanning technique. The dispersion diagrams show the A 0 and S 0 mode in a frequency range of 25–400 kHz. A mode selective actuator is designed to amplify the A 0 mode and to attenuate the S 0 mode at 40 kHz. Within experimental tests the actuator and circular piezoceramic sensors are applied on a CFRP plate in order to determine the mode selectivity. These tests are accompanied by 2D finite element simulations. On the basis of simulations and experimental test the influence of different parameters such as number and width of electrode segments, excitation signals and apodization is investigated. The results show that a mode selectivity of the A 0 mode in CFRP plates can be achieved by the designed actuator.

Item URL in elib:https://elib.dlr.de/81042/
Document Type:Article
Title:Design of mode selective actuators for Lamb wave excitation in composite plates
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:January 2013
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume:Vol. 3
DOI :10.1007/s13272-012-0059-3
Page Range:pp. 1-8
Keywords:Structural Health Monitoring (SHM), Lamb waves, Interdigital transducer, Mode selective actuators and sensors, CFRP plates
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Böhringer-Thelen, Isolde
Deposited On:01 Feb 2013 11:36
Last Modified:08 Mar 2018 19:01

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