Gedney, Stephen*

Project 1.

Title: Magneto-Stress Analysis

Grant: ONR Grant N00014-11-1-0584
Project Description: The purpose of this research is to develop a software tool set capable of predicting the magnetic signature of an underwater vessel under magneto-mechanical stress. A 3D finite-element stress analysis is combined with Magström, a locally corrected Nyström solution of the magnetostatic volume integral equation. The hysteretic magnetization and reverse magnetostriction properties of steel is modeled via a tensor-based Cooperative Hysteresis model. The multi-physics model is solved via a novel non-linear stepped solver. The methods have been validated against measured data, providing for the first time the ability to model hysteretic non-linear magnetic and magneto-stress behavior of complex three-dimensional structures.

Computational Methods Used:

Locally corrected Nyström solution of the quasi-magnetostatic volume integral equation, Finite-element solution of the elastostatic equations, non-linear solution methods.

Software used:

All software is developed by the UKY team. The dlx software relies on the Intel C++ compilers, Intel MKL library, and the Intel MPI libraries.

Faculty involved in project:

Stephen Gedney (PI)
John C. Young (co-PI)
Robert J. Adams (co-PI)

Students:

Cody Lonsbury, BS student in EE


Project 2.

Title: Closed Loop DeGaussing of Surface Vessels

Grant: ONR Grant N00014-13-1-0414
Project Description: The objective of this research is to develop a software prototype for a Closed Loop Degaussing (CLDG) system that utilizes a high fidelity magnetic model of the ship as well as a network of on-board magnetometers. The software will be capable of predicting changes in the ship’s induced and permanent magnetization, due to changes in induced or coil fields, as well as due to mechanical stresses. The software will also be able to accurately predict both on-board and off-board magnetic fields. This will allow a control system to accurately regulate the ship’s degaussing currents in order to maintain magnetic signatures below a threshold value.

Computational Methods Used:

Locally corrected Nyström solution of the quasi-magnetostatic volume integral equation, Fast LOGOS direct solution method.

Software used:

All software is developed by the UKY team. The dlx software relies on the Intel C++ compilers, Intel Fortran compilers, Intel MKL library, and the Intel MPI libraries.

Faculty involved in project:

Stephen Gedney (PI)
John C. Young (co-PI)
Robert J. Adams (co-PI)

Students:

Cody Lonsbury, BS student in EE


Project 3.

Title: DGFETD Enhancements

Grant: ERC Inc., Subcontract # RS121317
Project Description: The Discontinuous Galerkin Time-Domain software (DGFETD) developed under the Generalized Electromagnetic Framework (GEMF) was originally developed by the University of Kentucky in collaboration with The Aerospace Corporation. The software performs a high-order time-dependent solution of Maxwell’s equations 1-3. The DGFETD software has been in use by The Aerospace Corporation as well as a number of US DoD subcontractors for over 5 years. The focus of the effort contained within this statement of work is to provide a number of key enhancements needed to further the ability of the DGFETD software to meet the needs the Aerospace Corporation, AFRL, and collaborative DoD subcontractors.

Computational Methods Used:

Discontinuous Galerkin Finite-Element Time-Domain Method solution of Maxwell’s equations.

Software used:

All software is developed by the UKY team. The dlx software relies on the Intel C++ compilers Intel MKL library, and the Intel MPI libraries.

Faculty involved in project:

Stephen Gedney (PI)
John C. Young (co-PI)

Students:

Cody Lonsbury, BS student in EE

Publications - Gedney, Stephen

Recent publications that relied on the DLX:
Refereed Journals
1 S. D. Gedney, J. C. Young, T. C. Kramer, and J. A, Roden “A Discontinuous Galerkin Finite Element Time-Domain Method Modeling of Dispersive Media,” IEEE Transactions on Antennas and Propagation, vol. 60, no. 4, 1969-1977, April 2012. (2)
2 J. C. Young, Y. Xu, R. J. Adams, and S. D. Gedney “High-Order Nystrom Implementation of an Augmented Electric Field Integral Equation,” IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 846-849, 2012.
3 Bo Zhao, J. C. Young, and S. D. Gedney, “SPICE Lumped Circuit Sub-Cell Model for the Discontinuous Galerkin Finite Element Time-Domain Method,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 9, pp. 2684-2692, Sept. 2012.
4 J. C. Young, S. D. Gedney, and R. J. Adams, “Quasi-Mixed-Order Prism Basis Functions for Nystrom-Based Volume Integral Equations,” IEEE Transactions on Magnetics, vol. 48, no. 10, pp. 2560-2566, Oct. 2012.
5 J. C. Young, S. D. Gedney, and R. J. Adams, “Eddy Current Analysis using a Nyström-Discretization of the Volume Integral Equation,” IEEE Transactions on Magnetics, in press (in press), 2013.

Conference Proceedings

1 J. C. Young, S. D. Gedney, and R. J. Adams, “A High-Order Nyström-Based Volume Integral Equation for Quasi-Magnetostatic Problems with Eddy Currents,” The 28th Annual Review of Progress in Applied Computational Electromagnetics, Columbus, OH, April 10-14, 2012.
2 J. C. Young, S. D. Gedney, and R. J. Adams, “A Nyström Solution of the Quasi-Magnetostatic Volume Integral Equation for Eddy Current Analysis,” 2012 IEEE Symposium on Antennas and Propagation, Chicago, IL, July 8-13, 2012.
3 J. C. Young, Darren Boyd, S. D. Gedney, and T. Suzuki, “A DGFETD Analysis of a Terahertz-Band, Photoconductive Dipole Antenna,” 2012 IEEE Symposium on Antennas and Propagation, Chicago, IL, July 8-13, 2012.
4 J. C. Young, S. D. Gedney, and R. J. Adams, “Hysteresis Modeling with a Nyström Discretization of the Quasi-Magnetostatic Volume Integral Equation,” IEEE APS/URSI Symposium on Antennas and Propagation, Orlando, FL, July 7-11, 2012.
5 Bo Zhao, J. C. Young, and S. D. Gedney, “Thin Wire Subcell Models for the Discontinuous Galerkin Finite Element Time Domain Method,” IEEE APS/URSI Symposium on Antennas and Propagation, Spokane, WA, July 3-8, 2012.
6 J. C. Young, Darren Boyd, and S. D. Gedney, “A Discontinuous-Galerkin Finite-Element Time-Domain Analysis of Terahertz-Band Photoconductive Antennas,” 8th Kentucky Innovation and Entrepreneurship 2012 Conference, Louisville, KY, June 1, 2012.
7 J. C. Young, Darren Boyd, S. D. Gedney, J.-J. Liu, and T. Suzuki, “A Comparison of Measured and Computed Data for Photoconductive Antennas,” IEEE APS/URSI Symposium on Antennas and Propagation, Orlando, FL, July 7-11, 2012.

Grants

Title, Sponsor Dates Award
Gedney, Stephen N00014-14-1-0252 Magneto-Stress Analysis of Complex Structures Office of Naval Research 2/24/2014 - 2/25/2016 $263,478
Gedney, Stephen N00014-14-1-0161 Non-Uniform Loading of Surface Vessels Office of Naval Research 12/18/2013 - 12/30/2016 $170,000
Closed Loop Degaussing of Surface Vessel, Office of Naval Research (Gedney, PI) 2/01/13 – 12/31/13 $50,000
DGFETD Enhancements, ERC Inc. (Gedney, PI) 1/01/13 – 9/13/13 $118,568
Magstrom Enhancement, Office of Naval Research (ONR AWARD # N00014-13-1-0344) (Gedney, PI) 2/01/13 – 8/31/13 $63,287
MagnetoStress Analysis, Office of Naval Research (ONR AWARD# N00014-11-1-0584) (Gedney, PI) 6/1/11 – 5/31/13 $396,967
Photoconductive Antennas for Terahertz Spectroscopy and Imaging, Kentucky Science and Education Foundation (#KSEF-2489-RDE-014) (Young, PI, Gedney, co-PI) 7/1/11 – 6/30/14 $90,000
Large Scale Topside Electromagnetic Modeling, Office of Naval Research (ONR AWARD# N000141110625) (Adams, PI, Gedney, co-PI) 7/1/11 – 6/30/14 $698,413