Alliance for Sustainable Energy, LLC

Jason Cotrell

Robert Thresher

Alan Wright

Nathan Tom

Yi-Hsiang Yu

Scott Hughes

Michael Lawson

Scott Lambert

Jay Tillay Johnson

Sandy Butterfield

Described herein are wave energy conversion systems including actuated geometry components. An example system may include at least one body portion configured to transfer wave energy to a power take off device, and at least one actuated geometry component that is connected to the at least one body portion, the at least one actuated geometry component operable to modify a geometric profile of the system.

Wave energy conversion incorporating actuated geometry

An apparatus () for fatigue testing elongate test articles () including wind turbine blades through forced or resonant excitation of the base () of the test articles (). The apparatus () includes a testing platform or foundation (). A blade support () is provided for retaining or supporting a base () of an elongate test article (), and the blade support () is pivotally mounted on the testing platform () with at least two degrees of freedom of motion relative to the testing platform (). An excitation input assembly () is interconnected with the blade support () and includes first and second actuators () that act to concurrently apply forces or loads to the blade support (). The actuator forces are cyclically applied in first and second transverse directions. The test article () responds to shaking of its base () by oscillating in two, transverse directions ().

Wind turbine blade testing system using base excitation

A system () for fatigue testing wind turbine blades () through forced or resonant excitation of the base () of a blade (). The system () includes a test stand () and a restoring spring assembly () mounted on the test stand (). The restoring spring assembly () includes a primary spring element () that extends outward from the test stand () to a blade mounting plate () configured to receive a base () of blade (). During fatigue testing, a supported base () of a blade () may be pivotally mounted to the test stand () via the restoring spring assembly (). The system () may include an excitation input assembly () that is interconnected with the blade mounting plate () to selectively apply flapwise, edgewise, and/or pitch excitation forces. The restoring spring assembly () may include at least one tuning spring member () positioned adjacent to the primary spring element () used to tune the spring constant or stiffness of the primary spring element () in one of the excitation directions.

Base excitation testing system using spring elements to pivotally mount wind turbine blades

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Golden, CO, United States of America

Jason Cotrell