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Demonstration of energy harvesting with piezoelectrets in aircraft structures with a simplified structure based on a NASA wingbox model

: Holzmann, Hendrik; Schmelz, Jonas; Atzrodt, Heiko; Park, Ye Ji

Desmet, W. ; Katholieke Universiteit Leuven, Departement Werktuigkunde:
ISMA 2020, International Conference on Noise and Vibration Engineering. Proceedings : In conjunction with the 8th International Conference on Uncertainty in Structural Dynamics (USD2020), 7 to 9 September 2020, CD-ROM, virtually
Leuven: KU Leuven, 2020
ISBN: 978-90-828931-1-3
International Conference on Noise and Vibration Engineering <29, 2020, Online>
International Conference on Uncertainty in Structural Dynamics (USD) <8, 2020, Online>
Fraunhofer LBF ()

The purpose of this work is the demonstration of energy harvesting with piezoelectrets, also known as ferroelectrets, in aircraft structures under realistic circumstances. With an analysis of the NASA Common Research Model, strain distributions within an aircraft wingbox at specific frequencies are calculated. An FE model of a demonstrator structure represented by a thin aluminum plate in a four-point flexural test is developed to calculate the dynamic behaviour of attached piezoelectric electrets. In a test setup the structure is excited with a dynamic load in the frequency range between 50 Hz and 500 Hz. The voltage output of ferroelectrets is measured when glued directly to the surface and onto spacers. The experimental results are used for the validation of the FE model for a mechanical and a mechanical-electrical case. With the validated model, the power output of ferroelectrets exposed to the strain magnitude in the NASA CRM is calculated.
Furthermore a comparison of ferroelectrets to common piezoceramics for strain energy harvesting is conducted and the optimization of the power output is discussed.