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Title: User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes)

Abstract

This guide explains data preparation and execution with BModes, a finite-element code that provides dynamically coupled modes for a beam. The beam can be a rotating or non-rotating rotor blade or a tower, and it can have arbitrary distribution of structural properties and geometry along its length. A coupled mode implies presence of coupled flexural, axial, and torsion motions in a natural mode of vibration. Knowledge of flap-lag-torsion-axial coupled modes is crucial to several applications. Examples are: accurate modeling of major flexible components for modal-based aeroelastic codes such as FAST (Fatigue, Aerodynamics, Structures, and Turbulence), validation of flexible component models using experimental data, modal-based fatigue analysis, and interpretation of aeroelastic-stability behavior of turbines. Our plan is to eventually integrate BModes with FAST to provide tower and blade modes as rotor speed and blade pitch control settings change during a simulation. This guide provides step-by-step instructions on how to prepare input files (specify blade geometry, section properties, and finite-element discretization), how to execute the code, and how to interpret the outputs.

Authors:
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
861489
Report Number(s):
NREL/TP-500-39133
TRN: US200601%%875
DOE Contract Number:  
AC36-99-GO10337
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; AERODYNAMICS; DISTRIBUTION; GEOMETRY; ROTORS; SIMULATION; TORSION; TURBINES; TURBULENCE; VALIDATION; VELOCITY; WIND ENERGY; WIND TURBINES; CODES; SOFTWARE; ROTOR BLADE; TOWER; Wind Energy

Citation Formats

Bir, G. User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes). United States: N. p., 2005. Web. doi:10.2172/861489.
Bir, G. User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes). United States. https://doi.org/10.2172/861489
Bir, G. 2005. "User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes)". United States. https://doi.org/10.2172/861489. https://www.osti.gov/servlets/purl/861489.
@article{osti_861489,
title = {User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes)},
author = {Bir, G},
abstractNote = {This guide explains data preparation and execution with BModes, a finite-element code that provides dynamically coupled modes for a beam. The beam can be a rotating or non-rotating rotor blade or a tower, and it can have arbitrary distribution of structural properties and geometry along its length. A coupled mode implies presence of coupled flexural, axial, and torsion motions in a natural mode of vibration. Knowledge of flap-lag-torsion-axial coupled modes is crucial to several applications. Examples are: accurate modeling of major flexible components for modal-based aeroelastic codes such as FAST (Fatigue, Aerodynamics, Structures, and Turbulence), validation of flexible component models using experimental data, modal-based fatigue analysis, and interpretation of aeroelastic-stability behavior of turbines. Our plan is to eventually integrate BModes with FAST to provide tower and blade modes as rotor speed and blade pitch control settings change during a simulation. This guide provides step-by-step instructions on how to prepare input files (specify blade geometry, section properties, and finite-element discretization), how to execute the code, and how to interpret the outputs.},
doi = {10.2172/861489},
url = {https://www.osti.gov/biblio/861489}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}