The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2019
Filed:
Dec. 11, 2017
National Technology & Engineering Solutions of Sandia, Llc, Albuquerque, NM (US);
Michigan Technological University, Houghton, MI (US);
Ossama Abdelkhalik, Houghton, MI (US);
Giorgio Bacelli, Albuquerque, NM (US);
Shangyan Zou, Houghton, MI (US);
Rush D. Robinett, III, Tijeras, NM (US);
David G. Wilson, Tijeras, NM (US);
Ryan G. Coe, Albuquerque, NM (US);
National Technology & Engineering Solution of Sandia, LLC, Albuquerque, NC (US);
Michigan Technological University, Houghton, MI (US);
Abstract
The invention provides optimal control of a three-degree-of-freedom wave energy converter using a pseudo-spectral control method. The three modes are the heave, pitch and surge. A dynamic model is characterized by a coupling between the pitch and surge modes, while the heave is decoupled. The heave, however, excites the pitch motion through nonlinear parametric excitation in the pitch mode. The invention can use a Fourier series as basis functions to approximate the states and the control. For the parametric excited case, a sequential quadratic programming approach can be implemented to numerically solve for the optimal control. The numerical results show that the harvested energy from three modes is greater than three times the harvested energy from the heave mode alone. Moreover, the harvested energy using a control that accounts for the parametric excitation is significantly higher than the energy harvested when neglecting this nonlinear parametric excitation term.