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A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system
Thesis (M. Ing.) -- University of Stellenbsoch, 1992.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613792000540674 |
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| access_status_str | Open Access |
| author | De Waard, Pieter Gerrit |
| author2 | Pienaar, D. van V. |
| author_browse | De Waard, Pieter Gerrit Pienaar, D. van V. |
| author_facet | Pienaar, D. van V. De Waard, Pieter Gerrit |
| author_sort | De Waard, Pieter Gerrit |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Ing.) -- University of Stellenbsoch, 1992. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69494 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:46.341Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69494 A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system De Waard, Pieter Gerrit Pienaar, D. van V. Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Helicopters -- Control systems Stability of helicopters Helicopters -- Aerodynamics Dissertations -- Mechanical engineering Thesis (M. Ing.) -- University of Stellenbsoch, 1992. The open loop dynamics of the AH-1G helicopter was investigated during the course of an undergraduate research project. The various characteristic modes were identified, and the effect of forward speed on these modes were investigated, using root-loci. This thesis is an investigation of the closed loop dynamics of the same helicopter, and is done with the aid of linear and non-linear evaluation of the stability and control augmentation system (SCAS) of the AH-1G, a description of which is found in literature. The modes are discussed with reference to other authors and military handling qualities specifications. The non-linear evaluation was performed with HELPER, a non-linear simulation code developed as part of a research project into helicopter flight mechanics, as basis. The code is validated using Puma flight test data, and shows that HELPER is a sufficiently accurate model to use for the purposes of evaluating the SCAS. The inclusion of the linear SCAS model into the non-linear simulation environment is described. It was found that the short-term responses of the non-linear model show the same qualitative tendencies as was found with the linear evaluation. It is concluded that the primary purpose of the design of the SCAS is to increase damping of the short period modes, and to slow down the long-period (stable or unstable) modes. A secondary result of the SCAS is that the control channels are uncoupled to a large extent, reducing pilot work-load, as is shown for typical maneuvers. Masters 2012-08-27T12:27:07Z 2012-08-27T12:27:07Z 1992 Thesis http://hdl.handle.net/10019.1/69494 en Stellenbosch University 252 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Helicopters -- Control systems Stability of helicopters Helicopters -- Aerodynamics Dissertations -- Mechanical engineering De Waard, Pieter Gerrit A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title | A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title_full | A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title_fullStr | A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title_full_unstemmed | A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title_short | A linear and non-linear evaluation of the Bell AH-1G Huey-Cobra stability and control augmentation system |
| title_sort | linear and non linear evaluation of the bell ah 1g huey cobra stability and control augmentation system |
| topic | Helicopters -- Control systems Stability of helicopters Helicopters -- Aerodynamics Dissertations -- Mechanical engineering |
| url | http://hdl.handle.net/10019.1/69494 |
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