Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification

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OriginalspracheEnglisch
Titel des SammelwerksExperimental Vibration Analysis for Civil Engineering Structures
Herausgeber/-innenMaria Pina Limongelli, Pier Francesco Giordano, Carmelo Gentile, Said Quqa, Alfredo Cigada
Seiten529-538
Seitenumfang10
ISBN (elektronisch)978-3-031-39109-5
PublikationsstatusVeröffentlicht - 2023

Publikationsreihe

NameLecture Notes in Civil Engineering
Band432 LNCE
ISSN (Print)2366-2557
ISSN (elektronisch)2366-2565

Abstract

In this work, the complex mode shapes of closely spaced modes of a slender lattice tower structure identified with stochastic subspace identification (SSI) are investigated. The SSI delivers its results in the form of complex eigenvalues and eigenvectors. For a proportionally damped structure, the mode shape components of a single mode shape lie almost on a line in the complex plane, referred to as the mean phase. For closely spaced modes it is known, that the mode shape components are not necessarily on a line in the complex plane. The mean phase deviation as an identification quality criterion for the identification of mode shapes has less significance in connection with close modes, so that a different examination of these mode shapes is necessary. This study is performed using experimental data of a lattice tower under environmental variability. For the mode shapes of the closely spaced modes of the structure, two dominant phases are observed in the complex plane corresponding to the two measurement directions. The influence of the environmental conditions and different structural states of the structure on the corresponding mode shapes is investigated. A new approach in dealing with complex mode shapes of closely spaced modes was developed and allows a better interpretation of the identification results and can be useful in assessing the state of the structure.

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Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification. / Liesecke, Leon; Jonscher, Clemens; Grießmann, Tanja et al.
Experimental Vibration Analysis for Civil Engineering Structures. Hrsg. / Maria Pina Limongelli; Pier Francesco Giordano; Carmelo Gentile; Said Quqa; Alfredo Cigada. 2023. S. 529-538 (Lecture Notes in Civil Engineering; Band 432 LNCE).

Publikation: Beitrag in Buch/Bericht/Sammelwerk/KonferenzbandBeitrag in Buch/SammelwerkForschungPeer-Review

Liesecke, L, Jonscher, C, Grießmann, T & Rolfes, R 2023, Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification. in MP Limongelli, PF Giordano, C Gentile, S Quqa & A Cigada (Hrsg.), Experimental Vibration Analysis for Civil Engineering Structures. Lecture Notes in Civil Engineering, Bd. 432 LNCE, S. 529-538. https://doi.org/10.1007/978-3-031-39109-5_54
Liesecke, L., Jonscher, C., Grießmann, T., & Rolfes, R. (2023). Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification. In M. P. Limongelli, P. F. Giordano, C. Gentile, S. Quqa, & A. Cigada (Hrsg.), Experimental Vibration Analysis for Civil Engineering Structures (S. 529-538). (Lecture Notes in Civil Engineering; Band 432 LNCE). https://doi.org/10.1007/978-3-031-39109-5_54
Liesecke L, Jonscher C, Grießmann T, Rolfes R. Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification. in Limongelli MP, Giordano PF, Gentile C, Quqa S, Cigada A, Hrsg., Experimental Vibration Analysis for Civil Engineering Structures. 2023. S. 529-538. (Lecture Notes in Civil Engineering). Epub 2023 Aug 2. doi: 10.1007/978-3-031-39109-5_54
Liesecke, Leon ; Jonscher, Clemens ; Grießmann, Tanja et al. / Investigations of Mode Shapes of Closely Spaced Modes from a Lattice Tower Identified Using Stochastic Subspace Identification. Experimental Vibration Analysis for Civil Engineering Structures. Hrsg. / Maria Pina Limongelli ; Pier Francesco Giordano ; Carmelo Gentile ; Said Quqa ; Alfredo Cigada. 2023. S. 529-538 (Lecture Notes in Civil Engineering).
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abstract = "In this work, the complex mode shapes of closely spaced modes of a slender lattice tower structure identified with stochastic subspace identification (SSI) are investigated. The SSI delivers its results in the form of complex eigenvalues and eigenvectors. For a proportionally damped structure, the mode shape components of a single mode shape lie almost on a line in the complex plane, referred to as the mean phase. For closely spaced modes it is known, that the mode shape components are not necessarily on a line in the complex plane. The mean phase deviation as an identification quality criterion for the identification of mode shapes has less significance in connection with close modes, so that a different examination of these mode shapes is necessary. This study is performed using experimental data of a lattice tower under environmental variability. For the mode shapes of the closely spaced modes of the structure, two dominant phases are observed in the complex plane corresponding to the two measurement directions. The influence of the environmental conditions and different structural states of the structure on the corresponding mode shapes is investigated. A new approach in dealing with complex mode shapes of closely spaced modes was developed and allows a better interpretation of the identification results and can be useful in assessing the state of the structure.",
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N2 - In this work, the complex mode shapes of closely spaced modes of a slender lattice tower structure identified with stochastic subspace identification (SSI) are investigated. The SSI delivers its results in the form of complex eigenvalues and eigenvectors. For a proportionally damped structure, the mode shape components of a single mode shape lie almost on a line in the complex plane, referred to as the mean phase. For closely spaced modes it is known, that the mode shape components are not necessarily on a line in the complex plane. The mean phase deviation as an identification quality criterion for the identification of mode shapes has less significance in connection with close modes, so that a different examination of these mode shapes is necessary. This study is performed using experimental data of a lattice tower under environmental variability. For the mode shapes of the closely spaced modes of the structure, two dominant phases are observed in the complex plane corresponding to the two measurement directions. The influence of the environmental conditions and different structural states of the structure on the corresponding mode shapes is investigated. A new approach in dealing with complex mode shapes of closely spaced modes was developed and allows a better interpretation of the identification results and can be useful in assessing the state of the structure.

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