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2025 | OriginalPaper | Chapter

8. Identification of Modal Parameters of Coupled Rotor Foundation System via Automatic Operational Modal Analysis

Authors : Nathali Dreher, Tiago Machado, Thomas Paulsen, Ilmar Santos

Published in: Advances in Structural Vibration

Publisher: Springer Nature Switzerland

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Abstract

The chapter explores the identification of modal parameters in coupled rotor-foundation systems using Automatic Operational Modal Analysis (AOMA). It introduces the challenges and advantages of AOMA over traditional Experimental Modal Analysis (EMA), particularly in the context of rotating machinery. The research focuses on the application of an AOMA algorithm developed by Dreher et al. (2023) to a complex system influenced by gas seal pressure, validating its robustness and accuracy. The methodology involves the use of the Stochastic Subspace Identification (SSI) algorithm and hierarchical clustering techniques to extract and analyze modal parameters. The results are compared with EMA and OMA analyses from Paulsen et al. (2023), showing high accuracy and computational efficiency. The chapter concludes by highlighting the algorithm’s ability to identify most physical modes of interest, even in complex systems, and its potential for further development and application in the field of structural health monitoring.

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Title: Identification of Modal Parameters of Coupled Rotor Foundation System via Automatic Operational Modal Analysis
Authors: Nathali Dreher
Tiago Machado
Thomas Paulsen
Ilmar Santos
Publisher: Springer Nature Switzerland
Book: Advances in Structural Vibration
Print ISBN: 978-3-031-71539-6

Electronic ISBN: 978-3-031-71540-2

Copyright Year: 2025
DOI: https://doi.org/10.1007/978-3-031-71540-2_8