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:
Sep. 17, 2019
Filed:
Dec. 11, 2017
National Technology & Engineering Solutions of Sandia, Llc, Albuquerque, NM (US);
Michigan Technological University, Houghton, MI (US);
South Dakota Board of Regents, Pierre, SD (US);
Ossama Abdelkhalik, Houghton, MI (US);
Rush D. Robinett, III, Tijeras, NM (US);
Shangyan Zou, Houghton, MI (US);
David G. Wilson, Tijeras, NM (US);
Giorgio Bacelli, Albuquerque, NM (US);
Umesh Korde, Hancock, MI (US);
Ryan G. Coe, Albuquerque, NM (US);
National Technology & Engineering Solutions of Sandia, LLC, Albuquerque, NM (US);
Michigan Technological University, Houghton, MI (US);
South Dakota Board of Regents, Pierre, SD (US);
Abstract
A parametric excitation dynamic model is used for a three degrees-of-freedom (3-DOF) wave energy converter. Since the heave motion is uncoupled from the pitch and surge modes, the pitch-surge equations of motion can be treated as a linear time varying system, or a linear system with parametric excitation. In such case the parametric exciting frequency can be tuned to twice the natural frequency of the system for higher energy harvesting. A parametric excited 3-DOF wave energy converter can harvest more power, for both regular and irregular waves, compared to the linear 3-DOF. For example, in a Bretschneider wave, the harvested energy in the three modes is about 3.8 times the energy harvested in the heave mode alone; while the same device produces about 3.1 times the heave mode energy when using a linear 3-DOF model.