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Evaluation of alternatives for best-fit paraboloid for deformed antenna surfaces
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Baruch, Menahem Haftka, Raphael T. |
| Copyright Year | 1990 |
| Description | Paraboloid antenna surfaces suffer performance degradation due to structural deformation. A first step in the prediction of the performance degradation is to find the best-fit paraboloid to the deformed surface. Examined here is the question of whether rigid body translations perpendicular to the axis of the paraboloid should be included in the search for the best-fit paraboloid. It is shown that if these translations are included the problem is ill-conditioned, and small structural deformation can result in large translations of the best-fit paraboloid with respect to the original surface. The magnitude of these translations then requires nonlinear analysis for finding the best-fit paraboloid. On the other hand, if these translations are excluded, or if they are limited in magnitude, the errors with respect to the restricted not-so-best-fit paraboloid can be much greater than the errors with respect to the true best-fit paraboloid. |
| File Size | 451327 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910001000 |
| Archival Resource Key | ark:/13960/t6159h003 |
| Language | English |
| Publisher Date | 1990-03-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Degradation Errors Rigid Structures Deformation Ill-conditioned Problems Mathematics Translating Nonlinearity Parabolic Antennas Alternatives Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
