Ship Magnetic Signature due to Rotating Machinery using Equivalent Source Models
Abstract
Implement the NAVSESS Equivalent Source Model (ESM) within the Magström software. This task will developing an ESM source class object within the Magström. The object will compute the dynamic magnetic fields and magnetic vector potential radiated by the ESM model within the framework of the Magnetic-field Volume Integral Equation (MVIE) used by Magström. An AC steady-state source model will be implemented. This task will also involve developing an input framework for the ESM sources. This will involve sweeping over a broad range of frequencies based on the spectrum of the ESM sources, the source dipole types and locations, as well as the frequency dependent amplitudes. The implementation will initially be validated using a set of canonical problems. 2. Implement the Huygens Surface Source Model (HSSM) within the Magström software. This task will developing a HSSM source class object within the Magström. The object will compute the dynamic magnetic fields and magnetic vector potential radiated by the HSSM. An AC steady-state source model will be implemented. This task will also involve developing an input framework for the HSSM sources. This includes reading in a separate mesh for the HSSM surface, as well as data files containing the frequency dependent magnetic fields, and possibly their derivatives, on the HSSM surface. These fields will assumed to be interpolated over the surface using an appropriate vector basis. The ability to compute the tangential fields on the discrete HSSM mesh based on the interpolated HSSM fields will be investigated. The implementation will initially be validated using a set of canonical problems, and will be compared to the ESM model for the same problem. 3. Interact with NAVSESS. The UCD team will interact directly with NAVSESS to a) obtain ESM models based on computed and/or measured data that produce leakage fields of interest to NAVSESS. b) Collaborate on choosing appropriate Huygens surface geometries for the HSSM and to obtain HSSM data from NAVSES. c) To identify appropriate non-classified test case models of interest to NAVSESS for validation of the ESM and HSSM models within Magstrom. 4. Provide technical support to NAVSESS. The UCD team will provide technical support to NAVSESS to a) install the Magström on site at NAVSESS. b) Provide documentation and technical assistance to NAVSESS personnel to run the Magström software on their computers. c) Provide NAVSESS with test cases and models allowing them to validate both the EMS and Huygens surface models in Magström. 5. Validation. The end goal is to validate the ESM and HSSM models for a full scale ship. This will be done in collaboration with NAVSESS. 6. Provide technical support to NSWCCD. The UCD team will provide technical support to NSWCCD for proper operation of the Magström software to predict signatures due to electric machine leakage fields using the ESM and HSSM models, as well as any other technical assistance NSWCCD requires for the Magström software.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512258
Entities
People
- Stephen Gedney
Organizations
- Office of Naval Research
- Regents of the University of Colorado
- United States Navy