Retrofit systems for reconfiguration in civil aviation
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/9264 |
| _version_ | 1826197815644127232 |
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| author | Wohletz, Jerry M. (Jerry Matthew), 1971- |
| author2 | James D. Paduano. |
| author_facet | James D. Paduano. Wohletz, Jerry M. (Jerry Matthew), 1971- |
| author_sort | Wohletz, Jerry M. (Jerry Matthew), 1971- |
| collection | MIT |
| description | Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000. |
| first_indexed | 2024-09-23T10:53:34Z |
| format | Thesis |
| id | mit-1721.1/9264 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:53:34Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/92642019-04-12T07:36:04Z Retrofit systems for reconfiguration in civil aviation Wohletz, Jerry M. (Jerry Matthew), 1971- James D. Paduano. Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Aeronautics and Astronautics. Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000. Includes bibliographical references (p. 215-223). A new concept for retrofitting a reconfiguration module to an existing control law is reported in this thesis. The concept is motivated by the need for low cost, add-on modules that improve air safety in the existing fleet of civil air transport vehicles. A direct adaptive approach that accommodates control surface nonlinearities is adopted, which uses a slowly adapting model of the closed-loop aircraft as the reference model. The motivation, benefits, and components of the architecture are presented. In addition, the issues of control surface magnitude and rate saturation are addressed. A proof of stability is outlined for input-error adaptation when position and rate saturation are present. The reconfiguration architecture is demonstrated using an F/A-18 and a generic transport nonlinear simulator. General issues associated with commercial transport reconfiguration are highlighted. In both the longitudinal and directional axes, the control surfaces are not well balanced from a reconfiguration viewpoint. As a result, a novel reconfiguration control allocation scheme was devised that blends in all the control effectors in a given axis to perform the reconfiguration task. The simulation results revealed that the reconfiguration architecture does provide reconfiguration functionality for a wide variety of control surface failures. The reconfiguration potential is illustrated through comparisons of post-failure performance with and without reconfiguration via non-linear simulations. Additionally, comparisons between post-failure performance and nominal performance are made through non-linear simulations, closed-loop frequency responses, and aircraft handling qualities. For all of the failure scenarios illustrated, the simulation results showed that the aircraft without reconfiguration departs; with reconfiguration, nominal performance is achieve provided that adequate control authority exists post-failure. by Jerry M. Wohletz. Ph.D. 2005-08-22T23:55:46Z 2005-08-22T23:55:46Z 2000 2000 Thesis http://hdl.handle.net/1721.1/9264 45607726 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 224 p. 13076272 bytes 13076030 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Aeronautics and Astronautics. Wohletz, Jerry M. (Jerry Matthew), 1971- Retrofit systems for reconfiguration in civil aviation |
| title | Retrofit systems for reconfiguration in civil aviation |
| title_full | Retrofit systems for reconfiguration in civil aviation |
| title_fullStr | Retrofit systems for reconfiguration in civil aviation |
| title_full_unstemmed | Retrofit systems for reconfiguration in civil aviation |
| title_short | Retrofit systems for reconfiguration in civil aviation |
| title_sort | retrofit systems for reconfiguration in civil aviation |
| topic | Aeronautics and Astronautics. |
| url | http://hdl.handle.net/1721.1/9264 |
| work_keys_str_mv | AT wohletzjerrymjerrymatthew1971 retrofitsystemsforreconfigurationincivilaviation |