comparison of different oma techniques and their application to an axial compressor test rig

Publikation: Beitrag in Buch/Bericht/Sammelwerk/KonferenzbandAufsatz in KonferenzbandForschungPeer-Review

Autoren

  • Mona Amer
  • Joerg Wallaschek
  • Joerg R. Seume
  • Carlos E. Ventura

Externe Organisationen

  • University of British Columbia
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Titel des Sammelwerks9th IOMAC International Operational Modal Analysis Conference, Proceedings
Herausgeber/-innenCarlos E. Ventura, Mehrtash Motamedi, Alexander Mendler, Manuel Aenlle-Lopez
Seiten77-90
Seitenumfang14
ISBN (elektronisch)9788409443369
PublikationsstatusVeröffentlicht - 2022
Veranstaltung9th International Operational Modal Analysis Conference, IOMAC 2022 - Vancouver, Kanada
Dauer: 3 Juli 20226 Juli 2022

Publikationsreihe

Name9th IOMAC International Operational Modal Analysis Conference, Proceedings

Abstract

Identifying the modal properties of mechanical engineering systems while these are under operating conditions is still associated with major challenges, especially when said operation is induced by rotation of components. In this case, ambient vibration excitation, which is typically assumed for the application of output only techniques, is superposed by a deterministic periodic excitation component. This paper studies different techniques to perform an operational modal analysis in this particular situation. The methods are applied to an axial compressor test rig at the Institute of Turbomachinery and Fluid-Dynamics. Among them, three approaches, the Hilbert-Huang transform, the Bayesian OMA, and the stochastic subspace identification, are investigated. For the stochastic subspace identification, two different pole picking techniques to automatize the selection of stable poles from the stability diagram are studied. Furthermore, various approaches to deal with the harmonic excitation, which can lead to falsely identified modal parameters in the analysis process, are presented and applied to the data sets. Measurements at different rotational speeds of the rotor were collected and are used for the analysis. The results are summarized and the relative strengths and weaknesses of the different methods are discussed. The results obtained in this study are a first step towards a digital model to monitor the vibration behavior of rotating machinery using OMA techniques.

ASJC Scopus Sachgebiete

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comparison of different oma techniques and their application to an axial compressor test rig. / Amer, Mona; Wallaschek, Joerg; Seume, Joerg R. et al.
9th IOMAC International Operational Modal Analysis Conference, Proceedings. Hrsg. / Carlos E. Ventura; Mehrtash Motamedi; Alexander Mendler; Manuel Aenlle-Lopez. 2022. S. 77-90 (9th IOMAC International Operational Modal Analysis Conference, Proceedings).

Publikation: Beitrag in Buch/Bericht/Sammelwerk/KonferenzbandAufsatz in KonferenzbandForschungPeer-Review

Amer, M, Wallaschek, J, Seume, JR & Ventura, CE 2022, comparison of different oma techniques and their application to an axial compressor test rig. in CE Ventura, M Motamedi, A Mendler & M Aenlle-Lopez (Hrsg.), 9th IOMAC International Operational Modal Analysis Conference, Proceedings. 9th IOMAC International Operational Modal Analysis Conference, Proceedings, S. 77-90, 9th International Operational Modal Analysis Conference, IOMAC 2022, Vancouver, Kanada, 3 Juli 2022.
Amer, M., Wallaschek, J., Seume, J. R., & Ventura, C. E. (2022). comparison of different oma techniques and their application to an axial compressor test rig. In C. E. Ventura, M. Motamedi, A. Mendler, & M. Aenlle-Lopez (Hrsg.), 9th IOMAC International Operational Modal Analysis Conference, Proceedings (S. 77-90). (9th IOMAC International Operational Modal Analysis Conference, Proceedings).
Amer M, Wallaschek J, Seume JR, Ventura CE. comparison of different oma techniques and their application to an axial compressor test rig. in Ventura CE, Motamedi M, Mendler A, Aenlle-Lopez M, Hrsg., 9th IOMAC International Operational Modal Analysis Conference, Proceedings. 2022. S. 77-90. (9th IOMAC International Operational Modal Analysis Conference, Proceedings).
Amer, Mona ; Wallaschek, Joerg ; Seume, Joerg R. et al. / comparison of different oma techniques and their application to an axial compressor test rig. 9th IOMAC International Operational Modal Analysis Conference, Proceedings. Hrsg. / Carlos E. Ventura ; Mehrtash Motamedi ; Alexander Mendler ; Manuel Aenlle-Lopez. 2022. S. 77-90 (9th IOMAC International Operational Modal Analysis Conference, Proceedings).
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title = "comparison of different oma techniques and their application to an axial compressor test rig",
abstract = "Identifying the modal properties of mechanical engineering systems while these are under operating conditions is still associated with major challenges, especially when said operation is induced by rotation of components. In this case, ambient vibration excitation, which is typically assumed for the application of output only techniques, is superposed by a deterministic periodic excitation component. This paper studies different techniques to perform an operational modal analysis in this particular situation. The methods are applied to an axial compressor test rig at the Institute of Turbomachinery and Fluid-Dynamics. Among them, three approaches, the Hilbert-Huang transform, the Bayesian OMA, and the stochastic subspace identification, are investigated. For the stochastic subspace identification, two different pole picking techniques to automatize the selection of stable poles from the stability diagram are studied. Furthermore, various approaches to deal with the harmonic excitation, which can lead to falsely identified modal parameters in the analysis process, are presented and applied to the data sets. Measurements at different rotational speeds of the rotor were collected and are used for the analysis. The results are summarized and the relative strengths and weaknesses of the different methods are discussed. The results obtained in this study are a first step towards a digital model to monitor the vibration behavior of rotating machinery using OMA techniques.",
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AU - Wallaschek, Joerg

AU - Seume, Joerg R.

AU - Ventura, Carlos E.

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AB - Identifying the modal properties of mechanical engineering systems while these are under operating conditions is still associated with major challenges, especially when said operation is induced by rotation of components. In this case, ambient vibration excitation, which is typically assumed for the application of output only techniques, is superposed by a deterministic periodic excitation component. This paper studies different techniques to perform an operational modal analysis in this particular situation. The methods are applied to an axial compressor test rig at the Institute of Turbomachinery and Fluid-Dynamics. Among them, three approaches, the Hilbert-Huang transform, the Bayesian OMA, and the stochastic subspace identification, are investigated. For the stochastic subspace identification, two different pole picking techniques to automatize the selection of stable poles from the stability diagram are studied. Furthermore, various approaches to deal with the harmonic excitation, which can lead to falsely identified modal parameters in the analysis process, are presented and applied to the data sets. Measurements at different rotational speeds of the rotor were collected and are used for the analysis. The results are summarized and the relative strengths and weaknesses of the different methods are discussed. The results obtained in this study are a first step towards a digital model to monitor the vibration behavior of rotating machinery using OMA techniques.

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