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The application of fuzzy control to fed-batch fermentation
Bibliography: pages 101-105.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613519637118976 |
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| access_status_str | Open Access |
| author | Hadley, Trevor Deon |
| author2 | Swartz, C L E |
| author_browse | Hadley, Trevor Deon Swartz, C L E |
| author_facet | Swartz, C L E Hadley, Trevor Deon |
| author_sort | Hadley, Trevor Deon |
| collection | Thesis |
| description | Bibliography: pages 101-105. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21700 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:37:26.651Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21700 The application of fuzzy control to fed-batch fermentation Hadley, Trevor Deon Swartz, C L E Chemical Engineering Bibliography: pages 101-105. Fermentation processes are highly nonlinear and subject to variability. The fermentation's states are not readily available on-line and therefore the application of closed loop control schemes have been hindered. It was decided to investigate fuzzy control as it is able to deal with systems whose operation does not easily fit into the mathematical framework of traditional control approaches such as fermentations where the systems are highly nonlinear. The fermentation of lysine is an emergent industry in South Africa and it was therefore decided to focus on this fermentation. The control of penicillin fermentation was also investigated as it closely resembles the fermentation of lysine. A review of the types of control and estimation techniques used in the literature for biosystems was done to assess state of art in biocontrol. This covered optimal control techniques, neural networks, fuzzy controllers and adaptive control techniques. The operation and properties of fuzzy controllers were investigated. A specific form of fuzzy controller, presented in the literature, which was shown to correspond to a PI controller with a nonlinear gain was discussed. The effect of the number of output sampling points was analysed and it was found that the number of output sampling points used has an effect on the output and input response. It was also found that a higher number of sampling points results in a nonlinear integral constant and a non linear gain which has more resolution. The fuzzy controller's output response equations were found to be of a PI form with a possible bias term irrespective of the number of sampling points. The fuzzy controller was shown to yield better output and input response to that of an equivalently tuned linear PI controller for a first, second and third order system because it is able to take advantage of its nonlinear form. It was also shown that it is possible to obtain less severe input action for relatively the same value of SSE (sum of squared errors) when a higher number of sampling points is used for a first order system with dead time. 2016-09-06T14:45:48Z 2016-09-06T14:45:48Z 1995 Master Thesis Masters MSc (ChemEng) http://hdl.handle.net/11427/21700 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Hadley, Trevor Deon The application of fuzzy control to fed-batch fermentation |
| thesis_degree_str | Master's |
| title | The application of fuzzy control to fed-batch fermentation |
| title_full | The application of fuzzy control to fed-batch fermentation |
| title_fullStr | The application of fuzzy control to fed-batch fermentation |
| title_full_unstemmed | The application of fuzzy control to fed-batch fermentation |
| title_short | The application of fuzzy control to fed-batch fermentation |
| title_sort | application of fuzzy control to fed batch fermentation |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/21700 |
| work_keys_str_mv | AT hadleytrevordeon theapplicationoffuzzycontroltofedbatchfermentation AT hadleytrevordeon applicationoffuzzycontroltofedbatchfermentation |