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Predicting Electromagnetic Fields with GEMACS and the CEM Framework. Edgar L. Coffey Applied Research Associates, Inc. bcoffey@ara.com. Ground Vehicle Antenna Radiation. Center-fed at 50 Watts. Modeling Scenario Antenna on vehicle over ground plane Radiates in all directions Observables

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Predicting Electromagnetic Fields with GEMACS and the CEM Framework


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    1. Predicting Electromagnetic Fields with GEMACS and the CEM Framework Edgar L. Coffey Applied Research Associates, Inc. bcoffey@ara.com

    2. Ground Vehicle Antenna Radiation Center-fed at 50 Watts

    3. Modeling Scenario Antenna on vehicle over ground plane Radiates in all directions Observables Find where radiation levels are “excessive” Steps Build an EM model of the scene Execute GEMACS to find fields Extract desired observables from raw data Use SmartView to render the results Ground Vehicle Radiation Problem

    4. Start with the Vehicle • Main Menu • Edit • Add Element to Scene • Geometry • Select geometry file • Set rendering features • Set position at origin

    5. Add the Ground Plane • Main Menu • Edit • Add Element to Scene • Ground plane • Select geometry file • Set conductivity = 0.005 • Set rendering size = 100 m

    6. Excite the Antenna with 50 Watts • Main Menu • Edit • Add Element to Scene • Impressed Source • Value = 73.38 + j0 volts • Segment No. 16 • Frequency = 50 MHz • (No load)

    7. Request Surface Currents • Main Menu • Edit • Add Element to Scene • Surface/Wire Currents • Value = 73.38 + j0 volts • Select Results File

    8. Request Near-Zone Electric Fields -40 m < X < 40 m -40 m < Y < 40 m 0 m < Z < 26 m dx = dy = dz = 2 m (Only a small part of the lattice is shown.)

    9. Export to GEMACS and Run • Main Menu • File • Export • GEMACS • Enter file name • Main Menu • Execute • Launch GEMACS 6.11 Frequency and Excitation Segment and Conductivity Field Output Request Results XML File (Hand-generated GEMACS input shown for clarity.)

    10. Post-Process GEMACS’ Data The Framework’s Component View tool easily generates requested observables

    11. Generating Surface Currents Use Component View to post-process data, then view with SmartView

    12. Visualizing Surface Currents (Currents are color-coded according to their intensity.)

    13. Generating Contour Maps The full 3D field data set is read into Component View via XMLReader, then the user selects a “cut plane” on which to generate contours. The data are written to a SmartView-compatible file.

    14. Visualizing Contours of Fields • Rendered with AE’s SmartView. • Viewing contours from above. • Vehicle forward direction is +x axis. • YZ-plane is vehicle’s front face • Contour is taken at z = 2 m • Color scale units are in Volts/meter

    15. Generating IsoSurface Contours This map generates two surface and combines them with the vehicle

    16. Visualizing IsoContour Surfaces 2 V/m surface 5 V/m surface (Front of contours removed for clarity)

    17. Using Light to Enhance the View (Previous figure viewed from below)

    18. Combining Contours with IsoSurfaces (color mapped)

    19. Building the scene (15 minutes) Predicting fields (25 minutes) Post-processing the data (15 minutes) Visualization and Screenshots (20 minutes) All was done on a laptop PC with GEMACS and the CEM Framework Summary of Ground Vehicle Simulation and Visualization