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Effects of Boundary Conditions on the Structural Dynamics of Wind Turbine Blades. Part 2: Edgewise Modes

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Dynamics of Coupled Structures, Volume 1

Abstract

Mode shapes and resonant frequencies of an individual wind turbine blade can be readily determined in either a laboratory or a blade test facility using experimental modal analysis. However, performing a modal test on a utility-scale wind turbine with several blades attached to a tower can be a challenge due to the number of sensors required, the size of these structures, and cost. Therefore, understanding the influence of the coupled three-bladed turbine/tower system and identifying a correlation between the dynamic behavior of an assembled wind turbine to an individual blade or three-bladed turbine on a hub is desirable. In the current paper, which is the second part of a two-part paper, variation in natural frequencies and mode shapes of a three-bladed turbine due to the increase in stiffness of the support is numerically studied using a finite element beam analysis (a similar study was performed on flapwise modes of a turbine and is presented in the first part of this paper). The results of the study reveals that differential edgewise modes of the turbine that represent approximately 2/3 of edgewise modes are independent of the rotational stiffness of the support; thus, these modes can be predicted when the modes of cantilevered single blade are known. However, collective edgewise modes change significantly by changing rotational stiffness of the support. The mode contribution matrix of the wind turbine attached to a tower indicates the necessary set of modal vectors of the tower and three-bladed turbine to accurately obtain the edgewise dynamics of the final assembly.

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Acknowledgement

This material is based upon work supported by the National Science Foundation under Grant Number 1230884 (Achieving a Sustainable Energy Pathway for Wind Turbine Blade Manufacturing). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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Authors and Affiliations

  1. Structural Dynamics and Acoustic Systems Laboratory, One University Avenue, Lowell, MA, 01854, USA

    Javad Baqersad, Christopher Niezrecki & Peter Avitabile

Authors
  1. Javad Baqersad
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  2. Christopher Niezrecki
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  3. Peter Avitabile
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Correspondence to Javad Baqersad .

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Editors and Affiliations

  1. Engineering Physics Department, University of Wisconsin Madison, Madison, Wisconsin, USA

    Matt Allen

  2. Sandia National Laboratories, Albuquerque, New Mexico, USA

    Randy Mayes

  3. Lehrstuhl fur Angewandte Mechanik, Technische Universitat Munchen, Garching, Germany

    Daniel Rixen

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© 2014 The Society for Experimental Mechanics, Inc.

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Baqersad, J., Niezrecki, C., Avitabile, P. (2014). Effects of Boundary Conditions on the Structural Dynamics of Wind Turbine Blades. Part 2: Edgewise Modes. In: Allen, M., Mayes, R., Rixen, D. (eds) Dynamics of Coupled Structures, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-04501-6_35

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  • DOI: https://doi.org/10.1007/978-3-319-04501-6_35

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-04500-9

  • Online ISBN: 978-3-319-04501-6

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