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Task reports on developing techniques for scattering by 3d composite structures and to generate new solutions in diffraction theory using higher order boundary conditions (Document No: 19910009992)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Volakis, John L. |
| Copyright Year | 1991 |
| Description | There are two tasks described in this report. First, an extension of a two dimensional formulation is presented for a three dimensional body of revolution. A Fourier series expansion of the vector electric and magnetic fields is employed to reduce the dimensionality of the system, and an exact boundary condition is employed to terminate the mesh. The mesh termination boundary is chosen such that it leads to convolutional boundary operators for low O(n) memory demand. Second, rigorous uniform geometrical theory of diffraction (UTD) diffraction coefficients are presented for a coated convex cylinder simulated with generalized impedance boundary conditions. Ray solutions are obtained which remain valid in the transition region and reduce uniformly those in the deep lit and shadow regions. A uniform asymptotic solution is also presented for observations in the close vicinity of the cylinder. |
| File Size | 1556802 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910009992 |
| Archival Resource Key | ark:/13960/t9h46n661 |
| Language | English |
| Publisher Date | 1991-02-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Conjugate Gradient Method Boundary Conditions Boundary Integral Method Fast Fourier Transformations Asymptotic Methods Finite Element Method Three Dimensional Bodies Electromagnetic Scattering Cylindrical Bodies Series Expansion Bodies of Revolution Geometrical Theory of Diffraction Applications Programs Computers Convexity Magnetic Fields Composite Structures Electric Fields Electrical Impedance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
