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Methods of parameter identification used in the field of helicopters
Thesis (MEng (Mechanics)) -- University of Stellenbosch, 1990.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613756805087232 |
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| access_status_str | Open Access |
| author | Fitzhenry, Geoffrey Alan |
| author2 | Pienaar, D. van V. |
| author_browse | Fitzhenry, Geoffrey Alan Pienaar, D. van V. |
| author_facet | Pienaar, D. van V. Fitzhenry, Geoffrey Alan |
| author_sort | Fitzhenry, Geoffrey Alan |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng (Mechanics)) -- University of Stellenbosch, 1990. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/68871 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:41:12.661Z |
| 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:10019.1/68871 Methods of parameter identification used in the field of helicopters Fitzhenry, Geoffrey Alan Pienaar, D. van V. Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. System identification Helicopters -- Recognition Dissertations -- Mechanical engineering Thesis (MEng (Mechanics)) -- University of Stellenbosch, 1990. Three identification techniques most generally used in the field of helicopter flight mechanics are explained and discussed.The lesser used Instrumental Variable method is briefly explained and compared to the more popular methods but not applied to any data in the scope of this report.The Least Squares method is applied to a simulated two-input-two-output second order system with identified parameter errors in the order of 0.73 % for the case of small additive noise. The method, although popular, is generally used to obtain starting estimates for the more popular Maximum Likelihood method.The Maximum Likelihood method is applied to the model of a suspended solid cylindrical body in order to estimate the inertial properties of the body. Unfortunately due to inaccuracies in the calibration of the displacement and force sensors of the practical experiment, percentage differences between analytical and experimental results of up to 8.83 % were obtained. Although the results are not as close as was expected, the concept provides a compact method of identifying both the centre of gravity location and the inertial properties of a body. Masters 2012-08-27T12:26:48Z 2012-08-27T12:26:48Z 1990 Thesis http://hdl.handle.net/10019.1/68871 en Stellenbosch University 126 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | System identification Helicopters -- Recognition Dissertations -- Mechanical engineering Fitzhenry, Geoffrey Alan Methods of parameter identification used in the field of helicopters |
| title | Methods of parameter identification used in the field of helicopters |
| title_full | Methods of parameter identification used in the field of helicopters |
| title_fullStr | Methods of parameter identification used in the field of helicopters |
| title_full_unstemmed | Methods of parameter identification used in the field of helicopters |
| title_short | Methods of parameter identification used in the field of helicopters |
| title_sort | methods of parameter identification used in the field of helicopters |
| topic | System identification Helicopters -- Recognition Dissertations -- Mechanical engineering |
| url | http://hdl.handle.net/10019.1/68871 |
| work_keys_str_mv | AT fitzhenrygeoffreyalan methodsofparameteridentificationusedinthefieldofhelicopters |