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Title: Nonlinear controller for nonlinear wave energy converters

Abstract

The present invention is directed to a nonlinear controller for nonlinear wave energy converters (WECs). As an example of the invention, a nonlinear dynamic model is developed for a geometrically right-circular cylinder WEC design for the heave-only motion, or a single degree-of-freedom (DOF). The linear stiffness term is replaced by a nonlinear cubic hardening spring term to demonstrate the performance of a nonlinear WEC as compared to an optimized linear WEC. By exploiting the nonlinear physics in the nonlinear controller, equivalent power and energy capture, as well as simplified operational performance is observed for the nonlinear cubic hardening spring controller when compared to an optimized linear controller.

Inventors:
; ; ;
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1771583
Patent Number(s):
10823134
Application Number:
16/534,746
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM); Michigan Technological University (Houghton, MI)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03B - MACHINES OR ENGINES FOR LIQUIDS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
DOE Contract Number:  
NA0003525
Resource Type:
Patent
Resource Relation:
Patent File Date: 08/07/2019
Country of Publication:
United States
Language:
English

Citation Formats

Wilson, David G., Bacelli, Giorgio, Robinett, III, Rush D., and Abdelkhalik, Ossama. Nonlinear controller for nonlinear wave energy converters. United States: N. p., 2020. Web.
Wilson, David G., Bacelli, Giorgio, Robinett, III, Rush D., & Abdelkhalik, Ossama. Nonlinear controller for nonlinear wave energy converters. United States.
Wilson, David G., Bacelli, Giorgio, Robinett, III, Rush D., and Abdelkhalik, Ossama. Tue . "Nonlinear controller for nonlinear wave energy converters". United States. https://www.osti.gov/servlets/purl/1771583.
@article{osti_1771583,
title = {Nonlinear controller for nonlinear wave energy converters},
author = {Wilson, David G. and Bacelli, Giorgio and Robinett, III, Rush D. and Abdelkhalik, Ossama},
abstractNote = {The present invention is directed to a nonlinear controller for nonlinear wave energy converters (WECs). As an example of the invention, a nonlinear dynamic model is developed for a geometrically right-circular cylinder WEC design for the heave-only motion, or a single degree-of-freedom (DOF). The linear stiffness term is replaced by a nonlinear cubic hardening spring term to demonstrate the performance of a nonlinear WEC as compared to an optimized linear WEC. By exploiting the nonlinear physics in the nonlinear controller, equivalent power and energy capture, as well as simplified operational performance is observed for the nonlinear cubic hardening spring controller when compared to an optimized linear controller.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {11}
}

Works referenced in this record:

Nonlinearity induced synchronization enhancement in mechanical oscillators
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Frequency and amplitude stabilization in MEMS and NEMS oscillators
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Inertial wave energy converter
patent, October 2018


Negative-pressure wave generator
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journal, March 2011


Eccentrically rotating mass turbine
patent, January 2020


Controller for a wave energy converter
patent, September 2015


Nonlinear hydrodynamic and real fluid effects on wave energy converters
journal, March 2015