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Title: Superelement reduction of substructures for sequential load calculations in OpenFAST

Abstract

This article presents the superelement formulation newly implemented in OpenFAST to simulate fixed-bottom substructures with a reduced-order model similar to a common industry practice. The Guyan and Craig-Bampton methods are used to reduce the number of degrees of freedom and generate a so-called "superelement". The formulation allows manufacturers to exchange such superelements to perform load calculations without revealing sensitive information about the support structure (e.g., foundation, substructure, and/or tower) or turbine. The source code is made publicly available in the OpenFAST repository. Test cases with varying degrees of complexity are presented to validate the technique, and accuracy issues are discussed.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Keystone Engineering Inc., Metairie, LA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
OSTI Identifier:
1659881
Report Number(s):
NREL/JA-5000-75173
Journal ID: ISSN 1742-6588; MainId:7075;UUID:ef644332-61ec-e911-9c29-ac162d87dfe5;MainAdminID:13559
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 1452; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; substructures; foundations; superelements; FEM

Citation Formats

Branlard, E., Shields, M., Anderson, B., Damiani, R., Wendt, F., Jonkman, J., Musial, W., and Foley, B. Superelement reduction of substructures for sequential load calculations in OpenFAST. United States: N. p., 2020. Web. https://doi.org/10.1088/1742-6596/1452/1/012033.
Branlard, E., Shields, M., Anderson, B., Damiani, R., Wendt, F., Jonkman, J., Musial, W., & Foley, B. Superelement reduction of substructures for sequential load calculations in OpenFAST. United States. https://doi.org/10.1088/1742-6596/1452/1/012033
Branlard, E., Shields, M., Anderson, B., Damiani, R., Wendt, F., Jonkman, J., Musial, W., and Foley, B. Wed . "Superelement reduction of substructures for sequential load calculations in OpenFAST". United States. https://doi.org/10.1088/1742-6596/1452/1/012033. https://www.osti.gov/servlets/purl/1659881.
@article{osti_1659881,
title = {Superelement reduction of substructures for sequential load calculations in OpenFAST},
author = {Branlard, E. and Shields, M. and Anderson, B. and Damiani, R. and Wendt, F. and Jonkman, J. and Musial, W. and Foley, B.},
abstractNote = {This article presents the superelement formulation newly implemented in OpenFAST to simulate fixed-bottom substructures with a reduced-order model similar to a common industry practice. The Guyan and Craig-Bampton methods are used to reduce the number of degrees of freedom and generate a so-called "superelement". The formulation allows manufacturers to exchange such superelements to perform load calculations without revealing sensitive information about the support structure (e.g., foundation, substructure, and/or tower) or turbine. The source code is made publicly available in the OpenFAST repository. Test cases with varying degrees of complexity are presented to validate the technique, and accuracy issues are discussed.},
doi = {10.1088/1742-6596/1452/1/012033},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 1452,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
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Works referenced in this record:

Reduction of stiffness and mass matrices
journal, February 1965


Coupling of substructures for dynamic analyses.
journal, July 1968

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