Diffusion of Transient Electromagnetic Fields through Saturated Ferromagnetic Media
Abstract
Intense transient electromagnetic pulse fields may drive a ferromagnetic shield into saturation, thus reducing the shielding effectiveness of that shield. Often shielding computations ignore saturation effects due to the complexity of the equations. This memorandum reduces the complexity of the calculations by combining the approaches of several authors. The ferromagnetic material characteristics are incorporated directly into the field equations, amenable to computer solution. A math model of the material characteristics is presented. The magnetic permeability at a point in the ferromagnetic material is expressed as a function of H. The boundary conditions of the magnetic field equations in the time domain are developed. The numerical solution for the field emerging on the inside surface of an infinite sheet is accomplished by solving a differential equation subject to the boundary conditions. Certain approximations are indicated to simplify the calculations. The computer flow diagram is illustrated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1970
- Accession Number
- AD0721906
Entities
People
- D. J. Kozakoff
Organizations
- Sperry Corporation