Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup

Max Gille; Miles R.W. Judd; Daniel J. Rixen

doi:10.1007/978-3-031-04098-6_11

Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup

Max Gille, Miles R.W. Judd, Daniel J. Rixen

Chair of Applied Mechanics

Technical University of Munich

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

We perform Operational Modal Analysis (OMA) through Frequency Domain Decomposition (FDD) on a test structure using a high speed camera. Using optical flow algorithms, brightness changes due to displacements of a test structure under load are translated into displacement data. By using a mirror, a split image is generated that enables a stereoscopic view of the structure and thus 3D information can be extracted from the high speed video footage. This setup is used to determine the modal parameters of the structure, especially the mode shapes with high spatial resolution. The mirror that is used to gather a second point of view onto the image sensor enables a cost-efficient stereoscopic measurement compared to a two-camera setup. Moreover, it eliminates the need of synchronizing two separate signals. This is also why OMA is used instead of EMA: as no force signal needs to be recorded, we can perform a full-field modal analysis with inputs from only one single device. The results are evaluated taking into account the accuracy as well as the complexity of the setup of the 3D measurements compared to a setup using triaxial accelerometers.

Original language	English
Title of host publication	Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022
Editors	Dario Di Maio, Javad Baqersad
Publisher	Springer
Pages	97-104
Number of pages	8
ISBN (Print)	9783031040979
DOIs	https://doi.org/10.1007/978-3-031-04098-6_11
State	Published - 2023
Event	40th IMAC, A Conference and Exposition on Structural Dynamics, 2022 - Orlando, United States Duration: 7 Feb 2022 → 10 Feb 2022

Publication series

Name	Conference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)	2191-5644
ISSN (Electronic)	2191-5652

Conference

Conference	40th IMAC, A Conference and Exposition on Structural Dynamics, 2022
Country/Territory	United States
City	Orlando
Period	7/02/22 → 10/02/22

Keywords

High speed camera
Mode shapes
OMA
Operational modal analysis
Stereo vision

Access to Document

10.1007/978-3-031-04098-6_11

Cite this

Gille, M., Judd, M. R. W., & Rixen, D. J. (2023). Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup. In D. Di Maio, & J. Baqersad (Eds.), Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022 (pp. 97-104). (Conference Proceedings of the Society for Experimental Mechanics Series). Springer. https://doi.org/10.1007/978-3-031-04098-6_11

Gille, Max ; Judd, Miles R.W. ; Rixen, Daniel J. / Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup. Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022. editor / Dario Di Maio ; Javad Baqersad. Springer, 2023. pp. 97-104 (Conference Proceedings of the Society for Experimental Mechanics Series).

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title = "Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup",

abstract = "We perform Operational Modal Analysis (OMA) through Frequency Domain Decomposition (FDD) on a test structure using a high speed camera. Using optical flow algorithms, brightness changes due to displacements of a test structure under load are translated into displacement data. By using a mirror, a split image is generated that enables a stereoscopic view of the structure and thus 3D information can be extracted from the high speed video footage. This setup is used to determine the modal parameters of the structure, especially the mode shapes with high spatial resolution. The mirror that is used to gather a second point of view onto the image sensor enables a cost-efficient stereoscopic measurement compared to a two-camera setup. Moreover, it eliminates the need of synchronizing two separate signals. This is also why OMA is used instead of EMA: as no force signal needs to be recorded, we can perform a full-field modal analysis with inputs from only one single device. The results are evaluated taking into account the accuracy as well as the complexity of the setup of the 3D measurements compared to a setup using triaxial accelerometers.",

keywords = "High speed camera, Mode shapes, OMA, Operational modal analysis, Stereo vision",

author = "Max Gille and Judd, {Miles R.W.} and Rixen, {Daniel J.}",

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year = "2023",

doi = "10.1007/978-3-031-04098-6_11",

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Gille, M, Judd, MRW & Rixen, DJ 2023, Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup. in D Di Maio & J Baqersad (eds), Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022. Conference Proceedings of the Society for Experimental Mechanics Series, Springer, pp. 97-104, 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022, Orlando, United States, 7/02/22. https://doi.org/10.1007/978-3-031-04098-6_11

Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup. / Gille, Max; Judd, Miles R.W.; Rixen, Daniel J.
Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022. ed. / Dario Di Maio; Javad Baqersad. Springer, 2023. p. 97-104 (Conference Proceedings of the Society for Experimental Mechanics Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - We perform Operational Modal Analysis (OMA) through Frequency Domain Decomposition (FDD) on a test structure using a high speed camera. Using optical flow algorithms, brightness changes due to displacements of a test structure under load are translated into displacement data. By using a mirror, a split image is generated that enables a stereoscopic view of the structure and thus 3D information can be extracted from the high speed video footage. This setup is used to determine the modal parameters of the structure, especially the mode shapes with high spatial resolution. The mirror that is used to gather a second point of view onto the image sensor enables a cost-efficient stereoscopic measurement compared to a two-camera setup. Moreover, it eliminates the need of synchronizing two separate signals. This is also why OMA is used instead of EMA: as no force signal needs to be recorded, we can perform a full-field modal analysis with inputs from only one single device. The results are evaluated taking into account the accuracy as well as the complexity of the setup of the 3D measurements compared to a setup using triaxial accelerometers.

AB - We perform Operational Modal Analysis (OMA) through Frequency Domain Decomposition (FDD) on a test structure using a high speed camera. Using optical flow algorithms, brightness changes due to displacements of a test structure under load are translated into displacement data. By using a mirror, a split image is generated that enables a stereoscopic view of the structure and thus 3D information can be extracted from the high speed video footage. This setup is used to determine the modal parameters of the structure, especially the mode shapes with high spatial resolution. The mirror that is used to gather a second point of view onto the image sensor enables a cost-efficient stereoscopic measurement compared to a two-camera setup. Moreover, it eliminates the need of synchronizing two separate signals. This is also why OMA is used instead of EMA: as no force signal needs to be recorded, we can perform a full-field modal analysis with inputs from only one single device. The results are evaluated taking into account the accuracy as well as the complexity of the setup of the 3D measurements compared to a setup using triaxial accelerometers.

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Gille M, Judd MRW, Rixen DJ. Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup. In Di Maio D, Baqersad J, editors, Rotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics, 2022. Springer. 2023. p. 97-104. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-3-031-04098-6_11

Stereoscopic High Speed Camera Based Operational Modal Analysis Using a One-Camera Setup

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