1 / 19

Predicting Electromagnetic Fields with GEMACS and the CEM Framework

This paper details the methodology for predicting electromagnetic fields around ground vehicles utilizing GEMACS and the CEM framework. It outlines the modeling scenario involving a vehicle antenna radiating at 50 watts over a ground plane. The process includes building an electromagnetic model, executing GEMACS for field calculations, extracting observables, and visualizing results using SmartView. Key steps include configuring the scene, exciting the antenna, generating surface current maps, and creating contour visualizations to identify excessive radiation levels surrounding the vehicle.

emmanuel-dalton
Télécharger la présentation

Predicting Electromagnetic Fields with GEMACS and the CEM Framework

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related