Noise-robust modal parameter identification and damage assessment for aero-structures

Dessena, Gabriele; Civera, Marco; Pontillo, Alessandro; Ignatyev, Dmitry I.; Whidborne, James F.; Zanotti Fragonara, Luca

Abstract

Purpose
Ground vibration testing is critical for aircraft design and certification. Fast relaxed vector fitting (FRVF) and Loewner framework (LF), recently extended to modal parameter extraction in mechanical systems to address the computational challenges of time and frequency domain techniques, are applied for damage detection on aeronautically relevant structures.

Design/methodology/approach
FRVF and LF are applied to numerical datasets to assess noise robustness and performance for damage detection. Computational efficiency is also evaluated. In addition, they are applied to a novel damage detection benchmark of a high aspect ratio wing, comparing their performance with the state-of-the-art method N4SID.

Findings
FRVF and LF detect structural changes effectively; LF exhibits better noise robustness, while FRVF is more computationally efficient.

Practical implications
LF is recommended for noisy measurements.

Originality/value
To the best of the authors’ knowledge, this is the first study in which the LF and FRVF are applied for the extraction of the modal parameters in aeronautically relevant structures. In addition, a novel damage detection benchmark of a high-aspect-ratio wing is introduced.

• Journal Article Type: Article
• Acceptance Date: Aug 27, 2024
• Online Publication Date: Oct 1, 2024
• Publication Date: Oct 1, 2024
• Deposit Date: Oct 1, 2024
• Publicly Available Date: Oct 1, 2024
• Journal: Aircraft Engineering and Aerospace Technology
• Print ISSN: 1748-8842
• Electronic ISSN: 1758-4213
• Publisher: Emerald
• Peer Reviewed: Peer Reviewed
• Volume: 96
• Issue: 11
• Pages: 27-36
• DOI: https://doi.org/10.1108/aeat-06-2024-0178
• Public URL: https://uwe-repository.worktribe.com/output/13225742