A New Structural-Dynamics Module for Offshore Multimember Substructures within the Wind Turbine Computer-Aided Engineering Tool FAST: Preprint

Research output: Contribution to conferencePaper

Abstract

FAST, developed by the National Renewable Energy Laboratory (NREL), is a computer-aided engineering (CAE) tool for aero-hydro-servo-elastic analysis of land-based and offshore wind turbines. This paper discusses recent upgrades made to FAST to enable loads simulations of offshore wind turbines with fixed-bottom, multimember support structures (e.g., jackets and tripods, which are commonly used intransitional-depth waters). The main theory and strategies for the implementation of the multimember substructure dynamics module (SubDyn) within the new FAST modularization framework are introduced. SubDyn relies on two main engineering schematizations: 1) a linear frame finite-element beam (LFEB) model and 2) a dynamics system reduction via Craig-Bampton's method. A jacket support structureand an offshore system consisting of a turbine atop a jacket substructure were simulated to test the SubDyn module and to preliminarily assess results against results from a commercial finite-element code.
Original languageAmerican English
Number of pages12
StatePublished - 2013
Event23rd International Ocean, Offshore and Polar Engineering Conference - ISOPE 2013 - Anchorage, Alaska
Duration: 30 Jun 20135 Jul 2013

Conference

Conference23rd International Ocean, Offshore and Polar Engineering Conference - ISOPE 2013
CityAnchorage, Alaska
Period30/06/135/07/13

NREL Publication Number

  • NREL/CP-5000-58093

Keywords

  • beam finite element
  • dynamic reduction
  • multimember
  • NREL
  • offshore
  • state-space
  • support structure
  • wind turbine

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