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Measurement of structure dynamics using a tracking-interferometer

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Abstract

Measurement of structural dynamics can be used for dynamic characterization, diagnostics, condition monitoring, analyzing sources of vibration problems, design optimization and, finally, as comparison data to improve computation results. Mainly for open surfaces in automotive and aerospace industries the modal testing is often performed using laser vibrometers. In the case of partially closed structures as machine tools, modal analyses comprises the three dimensional vibration measurements at up to several hundred points of the structure and is classically conducted using accelerometers. This paper presents a novel approach to perform modal analyses using a tracking-interferometer. The modal analysis is shortly introduced along with the two mentioned methods. Further, the functionality of tracking-interferometers is discussed as well as the basics for their application in dynamic measurement. One-dimensional measurements using a tracking interferometer are conducted and benchmarked against other devices. Three-dimensional measurements are presented including the necessary coordinate transformation. A small modal analysis is demonstrated. Finally, a measurement strategy for fast modal testing is suggested and additional functionalities required for the tracking interferometer are discussed.

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Acknowledgments

This research is carried out in the project ‘DynaTrac’ funded by the German Federal Ministry of Education and Research (BMBF) within the Framework Concept “Research for Tomorrow’s Production” and managed by the Project Management Agency Forschungszentrum Karlsruhe, Production and Manufacturing Technologies Division (PTKA-PFT). The authors highly appreciate the support by Heinrich Schwenke and Mark Wissmann from etalon AG and Heiko Paluszek and Daniel Berk from sigma3D GmbH.

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Authors and Affiliations

  1. Laboratory for Machine Tools and Production Engineering (WZL), Chair of Machine Tools, RWTH Aachen University, Steinbachstr. 19, 52074, Aachen, Germany

    Christian Brecher, Alexander Guralnik & Stephan Bäumler

Authors
  1. Christian Brecher
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  2. Alexander Guralnik
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  3. Stephan Bäumler
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Correspondence to Alexander Guralnik.

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Brecher, C., Guralnik, A. & Bäumler, S. Measurement of structure dynamics using a tracking-interferometer. Prod. Eng. Res. Devel. 6, 89–96 (2012). https://doi.org/10.1007/s11740-011-0352-8

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  • DOI: https://doi.org/10.1007/s11740-011-0352-8

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