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Title: Verification of Floating Offshore Wind Linearization Functionality in OpenFAST

Abstract

The wind engineering community relies on multiphysics engineering software to run nonlinear time-domain simulations, e.g., for design standards-based loads analysis. Although most physics involved in wind energy are nonlinear, linearization of the underlying nonlinear system equations is often advantageous to understand the system properties and exploit well-established methods and tools for analyzing linear systems. Previous work in this area has focused on the development of the new linearization functionality of the open-source engineering tool OpenFAST for floating offshore wind turbines, as well as the concepts and mathematical background needed to understand and apply it correctly. This paper focuses on the verification of this new linearization functionality, which is carried out by comparing results to previous stable versions of FAST. A nonlinear time-domain simulation for a floating offshore platform is also compared to the time-domain response of the linearized state-space model. The linearized results show good alignment between OpenFAST and previous versions of FAST, as well as with the time-domain simulations, thereby showing the accuracy of the new features in OpenFAST.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (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), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1578255
Report Number(s):
NREL/JA-5000-74210
Journal ID: ISSN 1742-6588
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 1356; Journal Issue: 1; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; wind energy; offshore; linearization; OpenFAST; modeling; FAST

Citation Formats

Johnson, Nicholas, Jonkman, Jason, Wright, Alan D., Hayman, Greg, and Robertson, Amy N. Verification of Floating Offshore Wind Linearization Functionality in OpenFAST. United States: N. p., 2019. Web. doi:10.1088/1742-6596/1356/1/012022.
Johnson, Nicholas, Jonkman, Jason, Wright, Alan D., Hayman, Greg, & Robertson, Amy N. Verification of Floating Offshore Wind Linearization Functionality in OpenFAST. United States. doi:10.1088/1742-6596/1356/1/012022.
Johnson, Nicholas, Jonkman, Jason, Wright, Alan D., Hayman, Greg, and Robertson, Amy N. Thu . "Verification of Floating Offshore Wind Linearization Functionality in OpenFAST". United States. doi:10.1088/1742-6596/1356/1/012022. https://www.osti.gov/servlets/purl/1578255.
@article{osti_1578255,
title = {Verification of Floating Offshore Wind Linearization Functionality in OpenFAST},
author = {Johnson, Nicholas and Jonkman, Jason and Wright, Alan D. and Hayman, Greg and Robertson, Amy N.},
abstractNote = {The wind engineering community relies on multiphysics engineering software to run nonlinear time-domain simulations, e.g., for design standards-based loads analysis. Although most physics involved in wind energy are nonlinear, linearization of the underlying nonlinear system equations is often advantageous to understand the system properties and exploit well-established methods and tools for analyzing linear systems. Previous work in this area has focused on the development of the new linearization functionality of the open-source engineering tool OpenFAST for floating offshore wind turbines, as well as the concepts and mathematical background needed to understand and apply it correctly. This paper focuses on the verification of this new linearization functionality, which is carried out by comparing results to previous stable versions of FAST. A nonlinear time-domain simulation for a floating offshore platform is also compared to the time-domain response of the linearized state-space model. The linearized results show good alignment between OpenFAST and previous versions of FAST, as well as with the time-domain simulations, thereby showing the accuracy of the new features in OpenFAST.},
doi = {10.1088/1742-6596/1356/1/012022},
journal = {Journal of Physics. Conference Series},
number = 1,
volume = 1356,
place = {United States},
year = {2019},
month = {10}
}

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