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The internal performance of iterative feedback tuning
Includes bibliographical references (p. 113-115).
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2015
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| _version_ | 1867614316832751616 |
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| access_status_str | Open Access |
| author | Sikaundi, Jaston |
| author2 | Braae, Martin |
| author_browse | Braae, Martin Sikaundi, Jaston |
| author_facet | Braae, Martin Sikaundi, Jaston |
| author_sort | Sikaundi, Jaston |
| collection | Thesis |
| description | Includes bibliographical references (p. 113-115). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/14700 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:50:06.916Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/14700 The internal performance of iterative feedback tuning Sikaundi, Jaston Braae, Martin Electrical Engineering Electronic Engineering Includes bibliographical references (p. 113-115). Under certain conditions Iterative Feedback Tuning (IFT) may produce a controller that cancels the poles of the process and as a result can give a closed loop that has poor internal performance. The disadvantage of this is that the closed loop will have poor input disturbance rejection. A solution for ensuring that IFT does not have poor internal performance is to make sure that the disturbance rejection is adequate. However an adequate input disturbance may lead to other undesirable dynamics in the closed loop performance. These are such as overshoot in the response for setpoint tracking and that for output disturbance rejection. On the other hand the advantage of pole shifting is that for a one degree of freedom control structure all the characteristic equations of the loop transfer functions will be the same. Four methods are proposed for avoiding pole-zero cancellation by concentrating on the input disturbance. These methods are using: a model for input disturbance rejection, time-weighted IFT for disturbance rejection, a setpoint-tracking model with overshoot and approximate pole placement IFT. Approximate pole placement IFT was chosen as the best method. The reason is that the dynamics of the closed loop can be specified with the choice of characteristic equation. This method was then investigated further to establish its feasibility on a physical system. After the evaluation of this method, it was applied on a DC motor for speed control to show that is viable in practice. Multiple experiments were done to show that this method does not produce a controller that cancels the process poles, confirming it as a good solution to prevent poor internal performance. 2015-11-08T04:44:22Z 2015-11-08T04:44:22Z 2008 Master Thesis Masters MSc http://hdl.handle.net/11427/14700 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Electronic Engineering Sikaundi, Jaston The internal performance of iterative feedback tuning |
| thesis_degree_str | Master's |
| title | The internal performance of iterative feedback tuning |
| title_full | The internal performance of iterative feedback tuning |
| title_fullStr | The internal performance of iterative feedback tuning |
| title_full_unstemmed | The internal performance of iterative feedback tuning |
| title_short | The internal performance of iterative feedback tuning |
| title_sort | internal performance of iterative feedback tuning |
| topic | Electrical Engineering Electronic Engineering |
| url | http://hdl.handle.net/11427/14700 |
| work_keys_str_mv | AT sikaundijaston theinternalperformanceofiterativefeedbacktuning AT sikaundijaston internalperformanceofiterativefeedbacktuning |