Influence of Wind Turbine Design Parameters on Linearized Physics-Based Models in OpenFAST

Jason Jonkman, Emmanuel Branlard, John Jasa

Research output: Contribution to journalArticle


While most physics involved in wind energy are nonlinear, linearization of the underlying nonlinear wind-system equations is often important for understanding the system response and exploiting well-established methods and tools for analyzing linear systems. Linearized models are important for, e.g., eigenanalysis (to derive structural natural frequencies, damping ratios, and mode shapes) and controls design (based on linear state-space models). In controls co-design (CCD), whose methods often rely on linearized time-domain models of the physics, the physical structure (often called the plant) and controller are designed and optimized concurrently, so, it is important to understand how changes to the physical design affect the linearized system. This work summarizes efforts done to understand the impact of design parameter variations in the physical system (mass, stiffness, geometry, etc.) on the linearized system using OpenFAST.
Original languageAmerican English
Number of pages27
JournalWind Energy Science Discussions
StatePublished - 2021

Bibliographical note

See NREL/JA-5000-82662 for final paper as published in Wind Energy Science

NREL Publication Number

  • NREL/JA-5000-81481


  • controls co-design
  • design parameters
  • design variables
  • linearization
  • OpenFAST
  • wind turbine


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