Control of Unknown Control Direction System

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Hosseini Ardali, Mohsen | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45510 (06)
University: Sharif University of Technology
Department: Chemical Engineering and Petroleum
Advisor(s): Shahrokhi, Mohammad
Abstract:
This research is trying to investigate the control algorithms of unknown control direction systems. Since Nussbaum function is the most common method which in used for these systems this research focus on this algorithm to overcome control the effect of unknown control direction. This research study the performance of different control algorithms in controlling such systems followed by analysis of two control modes of continuous and discrete using Nussbam Function. Additionally, in continuous mode, the performance of two methods of backstepping and liding mode has been compared on the given system in variety of situation. Results demonstrate that backstepping method shows better performance in comparison with sliding mode one.Moreover, two ethods of output prediction and state prediction has been discussed in detail and compared. Results show that output prediction method demonstrate better control results as compared to state prediction one. However, considering the system as a whole, output prediction method is more practical and beneficial as a system is not always running in a single mode
Keywords:
Control ; Nonlinear System ; Nussbaum Function ; Continuous System ; Discrete System

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