公开(公告)号：US20180164755A1

公开(公告)日：2018-06-14

申请号：US15830770

申请日：2017-12-04

申请人： Ossama Abdelkhalik ,  Shangyan Zou ,  Rush D. Robinett, III ,  Umesh Korde ,  National Technology & Engineering Solutions of Sandia, LLC

发明人： Ossama Abdelkhalik ,  Shangyan Zou ,  Rush D. Robinett, III ,  David G. Wilson ,  Giorgio Bacelli ,  Ryan Geoffrey Coe ,  Umesh Korde

IPC分类号： G05B11/38 ,  F03B13/22 ,  F03B15/00 ,  G06F17/14

CPC分类号： G05B11/38 ,  F03B13/16 ,  F03B13/22 ,  F03B15/00 ,  F05B2240/93 ,  F05B2250/231 ,  F05B2250/241 ,  F05B2250/43 ,  F05B2270/20 ,  G06F17/142 ,  Y02E10/38

摘要： Multi-resonant control of a 3 degree-of-freedom (heave-pitch-surge) wave energy converter enables energy capture that can be in the order of three times the energy capture of a heave-only wave energy converter. The invention uses a time domain feedback control strategy that is optimal based on the criteria of complex conjugate control. The multi-resonant control can also be used to shift the harvested energy from one of the coupled modes to another, enabling the elimination of one of the actuators otherwise required in a 3 degree-of-freedom wave energy converter. This feedback control strategy does not require wave prediction; it only requires the measurement of the buoy position and velocity.

公开(公告)号：US20180163691A1

公开(公告)日：2018-06-14

申请号：US15837885

申请日：2017-12-11

申请人： Ossama Abdelkhalik ,  Rush D. Robinett, III ,  Shangyan Zou ,  Umesh Korde ,  National Technology & Engineering Solutions of Sandia, LLC

发明人： Ossama Abdelkhalik ,  Rush D. Robinett, III ,  Shangyan Zou ,  David G. Wilson ,  Giorgio Bacelli ,  Umesh Korde ,  Ryan G. Coe

IPC分类号： F03B13/18 ,  G06F1/02 ,  F03B15/00

CPC分类号： F03B13/183 ,  F03B13/16 ,  F03B15/00 ,  F05B2250/43 ,  F05B2270/20 ,  G06F1/02 ,  G06F1/022 ,  Y02E10/38

摘要： 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.

公开(公告)号：US10415537B2

公开(公告)日：2019-09-17

申请号：US15837885

申请日：2017-12-11

申请人： National Technology & Engineering Solutions of Sandia, LLC ,  Michigan Technological University ,  South Dakota Board of Regents

发明人： Ossama Abdelkhalik ,  Rush D. Robinett, III ,  Shangyan Zou ,  David G. Wilson ,  Giorgio Bacelli ,  Umesh Korde ,  Ryan G. Coe

IPC分类号： F03B13/10 ,  F03B13/12 ,  F03B13/18 ,  F03B15/00 ,  G06F1/02 ,  F03B13/16

摘要： 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.

公开(公告)号：US12129820B1

公开(公告)日：2024-10-29

申请号：US17949818

申请日：2022-09-21

申请人： National Technology & Engineering Solutions of Sandia, LLC ,  The Johns Hopkins University

发明人： Umesh Korde ,  Ryan G. Coe ,  Giorgio Bacelli

IPC分类号： F03B13/14

CPC分类号： F03B13/14 ,  F03B13/142

摘要： A tubular wave energy converter configured to remain afloat near the surface of a wave field and trap a water column oscillating asymmetrically to the wave field in which the converter is located. Water column oscillations create a pressure flux providing motive power for a generator. The converter, generator and a powered payload making up an autonomous wave powered device are packaged to fit within and be deployed by a torpedo launcher. The autonomous device may be deployed above or beneath the surface. Device buoyant characteristics are configured to maintain the device afloat and self-righting toward an upright oriented for operation in the wave field.

公开(公告)号：US10197040B2

公开(公告)日：2019-02-05

申请号：US15466605

申请日：2017-03-22

申请人： National Technology & Engineering Solutions of Sandia, LLC ,  Michigan Technological University ,  South Dakota Board of Regents

发明人： Ossama Abdelkhalik ,  Rush D. Robinett, III ,  Shangyan Zou ,  Giorgio Bacelli ,  David G. Wilson ,  Umesh Korde

IPC分类号： F03B13/16 ,  G05B19/406 ,  F03B15/00

摘要： A wave energy converter and method for extracting energy from water waves maximizes the energy extraction per cycle by estimating an excitation force of heave wave motion on the buoy, computing a control force from the estimated excitation force using a dynamic model, and applying the computed control force to the buoy to extract energy from the heave wave motion. Analysis and numerical simulations demonstrate that the optimal control of a heave wave energy converter is, in general, in the form of a bang-singular-bang control; in which the optimal control at a given time can be either in the singular arc mode or in the bang-bang mode. The excitation force and its derivatives at the current time can be obtained through an estimator, for example, using measurements of pressures on the surface of the buoy in addition to measurements of the buoy position. A main advantage of this approximation method is the ease of obtaining accurate measurements for pressure on the buoy surface and for buoy position, compared to wave elevation measurements.

公开(公告)号：US20170298899A1

公开(公告)日：2017-10-19

申请号：US15466605

申请日：2017-03-22

申请人： Umesh Korde ,  Sandia Corporation ,  Michigan Technological University

发明人： Ossama Abdelkhalik ,  Rush D. Robinett, III ,  Shangyan Zou ,  Giorgio Bacelli ,  David G. Wilson ,  Umesh Korde

IPC分类号： F03B15/00 ,  G05B19/406 ,  F03B13/16

CPC分类号： F03B15/00 ,  F03B13/16 ,  F05B2220/706 ,  F05B2260/84 ,  F05B2270/20 ,  G05B19/406 ,  G05B2219/39218 ,  Y02E10/38

摘要： A wave energy converter and method for extracting energy from water waves maximizes the energy extraction per cycle by estimating an excitation force of heave wave motion on the buoy, computing a control force from the estimated excitation force using a dynamic model, and applying the computed control force to the buoy to extract energy from the heave wave motion. Analysis and numerical simulations demonstrate that the optimal control of a heave wave energy converter is, in general, in the form of a bang-singular-bang control; in which the optimal control at a given time can be either in the singular arc mode or in the bang-bang mode. The excitation force and its derivatives at the current time can be obtained through an estimator, for example, using measurements of pressures on the surface of the buoy in addition to measurements of the buoy position. A main advantage of this approximation method is the ease of obtaining accurate measurements for pressure on the buoy surface and for buoy position, compared to wave elevation measurements.