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Operational Modal Analysis of Rotating Structures Under Ambient Excitation Using Tracking Continuously Scanning Laser Doppler Vibrometry

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Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6

Abstract

A continuously scanning laser Doppler vibrometer (CSLDV) system is capable of rapidly obtaining spatially dense vibration measurement by continuously sweeping its laser spot along a path on a structure surface. This paper presents a new operational modal analysis (OMA) method for a rotating structure based on a rigorous rotating beam vibration theory, an image processing method, and a data processing method called the lifting method. A novel tracking CSLDV (TCSLDV) system was developed in this work to track and scan a rotating structure, and the real-time position of the rotating structure can be determined by image processing so that the TCSLDV system is capable of tracking a time-varying scan path on the rotating structure. The lifting method can transform raw TCSLDV measurement into measurements at multiple virtual measurement points as if they were measured by transducers attached to these measurement points. Modal parameters of the rotating structure with a constant speed, including damped natural frequencies, undamped mode shapes, and modal damping ratios, and operating deflection shapes (ODSs) of the structure with a constant or prescribed time-varying rotation speed can be determined by calculating and analyzing correlation functions with non-negative time delays among measurements at virtual measurement points. Experimental investigation is conducted using the TCSLDV system to study the OMA method with which modal parameters and an ODS of a rotating fan blade with different constant speeds, as well as an ODS of the rotating fan blade with a non-constant speed, are successfully estimated.

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Acknowledgments

The authors are grateful for the financial support from the National Science Foundation through Grant No. CMMI-1763024. The authors would like to thank Daming Chen for some valuable discussion on the TCSLDV system.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Maryland, Baltimore, MD, USA

    L. F. Lyu & W. D. Zhu

Authors
  1. L. F. Lyu
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  2. W. D. Zhu
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Corresponding author

Correspondence to W. D. Zhu .

Editor information

Editors and Affiliations

  1. MS3, University of Twente, ENSCHEDE, Overijssel, The Netherlands

    Dario Di Maio

  2. Kettering University, Flint, MI, USA

    Javad Baqersad

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Lyu, L.F., Zhu, W.D. (2022). Operational Modal Analysis of Rotating Structures Under Ambient Excitation Using Tracking Continuously Scanning Laser Doppler Vibrometry. In: Di Maio, D., Baqersad, J. (eds) Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-76335-0_5

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  • DOI: https://doi.org/10.1007/978-3-030-76335-0_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-76334-3

  • Online ISBN: 978-3-030-76335-0

  • eBook Packages: EngineeringEngineering (R0)

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