PSI - Issue 37

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 37 (2022) 241–249

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© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract The health and usage monitoring systems are widely used for the monitoring of vibrations of power plant units on helicopters. At the same time critical helicopter structures like main and tail rotors or tail boom are still out of permanent monitoring. Practically all non-destructive techniques (NDT), like ultrasound, eddy current, X-ray and others make the inspection of structural components available on the ground only, during the maintenance check or overhaul. The article considers the promising technique for structural health monitoring (SHM) of a helicopter in flight, inter alia, of rotating blades. Actively developing methods of modal analysis, especially “operational” one, open the new opportunity for structural monitoring and its attendant issues. The Operational M odal Analysis (OMA) techniques and the methods of its data application are the basis of t he novel concept of “modal passport” for monitoring of helicopter’s blades. There is brief description of basic principles of the modal passport and its trial applica tion. The paper discusses the problems associated with practical application of modal passport to rotating helicopter blades and ways to overcome it. The light coaxial helicopter Ka-26 became the operating platform for experimental study of OMA application and works as the demonstrator of advance SHM techniques. Brief description of measurement system, including equipment and transducers on the blades is presented. The discussed research stage aims to demonstrate the potential of OMA techniques for monitoring of rotating blades, applying the seeded faults to estimate sensitivity of the SHM system. The paper discusses analytical and experimental study of the blade, including FE modelling and comparative analysis with the experimental data. The conclusions of the paper summarize the results of the research stage, outline the novelties and its practical application. The tasks of further works for SHM research stages using the demonstrator are formulated. Abstract The health and usage monitoring systems are widely used for the monitoring of vibrations of power plant units on helicopters. At the same time critical helicopter structures like main and tail rotors or tail boom are still out of permanent monitoring. Practically all non-destructive techniques (NDT), like ultrasound, eddy current, X-ray and others make the inspection of structural components available on the ground ly, during the maintenance ch ck ov rhaul. The article considers the promisi g technique for structural health monitoring (SHM) f a helicopter in flight, inter alia, f rotating blades. Active y developing me hods of modal nalysis, especially “operational” on , open the new opportunity for structural monitoring and its attenda t issues. The Ope tional M odal Ana ysis (OMA) techniques and the methods of its data application are the basis f t he nov l c ncept of “modal pas port” for monitoring of helicopter’s bl des. Ther is brief description of basic principles of the modal pass ort and its trial applica tion. The pa r discusses the problems associated ith p actical application of modal passpor to rotati g helicopter blades and ways to overcome it. The lig t coaxial helicopt r Ka-26 became the operati g platform for exp rimental study of OMA p lication and w rks as the d mons rator of advanc SHM techniques. Brief desc pt on of measurement ystem, includ ng equipme t and tr nsducers on the blades is pre ented. The discussed resear h stage aims to demonstrate the potent al of OMA techniques for monit ring of rotat ng blades, app ying the seeded faults to stimate sensitivity of the SHM system. The paper discusses nalytical and experim ntal study of the bl e, including FE modelling and compara ve analysis with the experi enta data. The conclusio s of the paper summarize the results of the research stag , outline th novelties and it prac ical applic ti n. The tasks of furthe w rks for SHM research stages using the demonstr tor are formulated. Keywords: helicopter’s structural health monitoring; operational modal analysis; modal passport. ICSI 2021 The 4th International Conference on Structural Integrity The Demonstrator of Structural Health Monitoring System of Helicopter Composite Blades Aleksey Mironov a 0 F0 F0 F0 F *, Pavel Doronkin b ICSI 2021 The 4th International Conference on Structural Integrity The Demonstrator of St uctural H alth Monito ing System of Helicopter Composite Blades Aleksey Mironov a 0 F0 F0 F0 F *, Pavel Doronkin b a D un D centrs, Riga, LV-1021, Latvia b D un D centrs, Riga, LV-1021, Latvia a D un D centrs, Riga, LV-1021, Latvia b D un D centrs, Riga, LV-1021, Latvia

Keywords: helicopter’s structural health monitoring; operational modal analysis; modal passport.

* Corresponding author. Tel.: +371 67 46 88 50; fax: +371 67 46 88 56. E-mail address: info@ddcentrs.lv

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.080 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira * Corresponding author. Tel.: +371 67 46 88 50; fax: +371 67 46 88 56. E-mail address: info@ddcentrs.lv