Verification of BModes : rotary beam and tower modal analysis code : preprint / Gunjit Bir.

Format:

Book

Author/Creator:

Bir, Gunjit S.

Contributor:

National Renewable Energy Laboratory (U.S.)

Series:

Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-500-47953.

Conference paper ; NREL/CP-500-47953

Language:

English

Subjects (All):

Wind turbines--Computer simulation.

Wind turbines.

BModes (Computer program).

Physical Description:

1 online resource (15 pages) : color illustrations

Place of Publication:

Golden, CO : National Renewable Energy Laboratory, 2010.

Summary:

This paper describes verification of BModes, a finite-element code developed to provide coupled modes for the blades and tower of a wind turbine. The blades, which may be rotating or non-rotating, and the towers, whether onshore or offshore, are modeled using specialized 15-dof beam finite elements. Both blade and tower models allow a tip attachment, which is assumed to be rigid body with six moments of inertia, and a mass centroid that may be offset from the blade or tower axis. Examples of tip attachments are aerodynamic brakes for blades and nacelle-rotor subassembly for towers. BModes modeling allows for tower supports including tension wires, floating platforms, and monopiles on elastic foundations. Coupled modes (implying coupling of flap, lag, axial, and torsional motions) are required for modeling major flexible components in a modal-based, aeroelastic code such as FAST. These are also required for validation of turbine models using experimental data, modal-based fatigue analysis, controls design, and understanding aeroelastic-stability behavior of turbines.

Notes:

Title from title screen (viewed April 19, 2010).

"April 2010."

"To be presented at 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Orlando, Florida, April 12-15, 2010."

Includes bibliographical references.

OCLC:

607926543