A novel strain-based health indicator for the remaining useful life estimation of degrading composite structures

A novel strain-based health indicator for the remaining useful life estimation of degrading composite structures

Galanopoulos, Georgios (University of Patras)
Eleftheroglou, N. (TU Delft Structural Integrity & Composites; University of Patras)
Milanoski, Dimitrios (University of Patras)
Broer, Agnes A.R. (TU Delft Structural Integrity & Composites)
Zarouchas, D. (TU Delft Structural Integrity & Composites)
Loutas, Theodoros (University of Patras)

2023

We present a generic methodology for developing a Health Indicator out of strain-based Structural Health Monitoring data suitable for implementation in prognostic tasks. For this purpose, an in-house test campaign is launched. Single-stringered composite panels are subjected to compression-compression fatigue with the strains being monitored with Fiber Bragg Grating sensors located along the stringers’ feet. Three different fatigue scenarios with increased complexity are investigated i.e. constant amplitude fatigue, variable amplitude fatigue and finally random amplitude (spectrum) fatigue. In this paper, we propose a fusion scheme based on Genetic Algorithms, with the resulted fused Health Indicator achieving high monotonicity and prognosability, both crucial attributes for an enhanced performance of prognostic algorithms. Finally, a popular machine learning algorithm, i.e. Gaussian Process Regression, is employed in order to predict the Remaining Useful Life of the panels in the test set. It is evidenced that the newly proposed fused Health Indicator predicts the Remaining Useful Life far more accurately as several popular performance metrics indicate. The methodology retains a data agnostic character able to be applied in Structural Health Monitoring data from different sensing technologies.

Composite structures
Fiber Bragg grating sensors
Genetic algorithms
Health indicators
Remaining Useful Life prediction
Structural health monitoring

http://resolver.tudelft.nl/uuid:0ae3c18e-1f86-4e90-bf4a-b2052faec3e6

https://doi.org/10.1016/j.compstruct.2022.116579

2023-07-01

0263-8223

Composite Structures, 306

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2023 Georgios Galanopoulos, N. Eleftheroglou, Dimitrios Milanoski, Agnes A.R. Broer, D. Zarouchas, Theodoros Loutas