Superelement reduction of substructures for sequential load calculations in OpenFAST

Branlard, E.; Shields, M.; Anderson, B.; Damiani, R.; Wendt, F.; Jonkman, J.; Musial, W.; Foley, B.

doi:10.1088/1742-6596/1452/1/012033

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:

^[1];

^[1]; Damiani, R. ^[1]; Wendt, F. ^[1];

^[1]; Musial, W. ^[1]; Foley, B. ^[2]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Keystone Engineering Inc., Metairie, LA (United States)

Publication Date:: Wed Mar 04 00:00:00 EST 2020

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; FEM; foundations; substructures; superelements

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.  doi:10.1088/1742-6596/1452/1/012033.

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                    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

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                    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.

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@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         = {Wed Mar 04 00:00:00 EST 2020},

  month        = {Wed Mar 04 00:00:00 EST 2020}

}

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Works referenced in this record:

Flexible multibody dynamics using joint coordinates and the Rayleigh‐Ritz approximation: The general framework behind and beyond Flex
journal, April 2019

Branlard, Emmanuel Simon Pierre
Wind Energy
DOI: 10.1002/we.2327

Reduction of stiffness and mass matrices
journal, February 1965

Guyan, Robert J.
AIAA Journal, Vol. 3, Issue 2
DOI: 10.2514/3.2874

Accurate and efficient modeling of complex offshore wind turbine support structures using augmented superelements: Augmented superelement modeling of offshore support structures
journal, April 2013

Voormeeren, S. N.; van der Valk, P. L. C.; Nortier, B. P.
Wind Energy, Vol. 17, Issue 7
DOI: 10.1002/we.1617

Coupling of substructures for dynamic analyses.
journal, July 1968

Craig, Roy R.; Bampton, Mervyn C. C.
AIAA Journal, Vol. 6, Issue 7
DOI: 10.2514/3.4741

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Similar Records

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

Abstract

Citation Formats

Flexible multibody dynamics using joint coordinates and the Rayleigh‐Ritz approximation: The general framework behind and beyond Flex journal, April 2019

Reduction of stiffness and mass matrices journal, February 1965

Accurate and efficient modeling of complex offshore wind turbine support structures using augmented superelements: Augmented superelement modeling of offshore support structures journal, April 2013

Coupling of substructures for dynamic analyses. journal, July 1968

Flexible multibody dynamics using joint coordinates and the Rayleigh‐Ritz approximation: The general framework behind and beyond Flex
journal, April 2019

Reduction of stiffness and mass matrices
journal, February 1965

Accurate and efficient modeling of complex offshore wind turbine support structures using augmented superelements: Augmented superelement modeling of offshore support structures
journal, April 2013

Coupling of substructures for dynamic analyses.
journal, July 1968