Design of Robust Controller for Depth of Anesthesia

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Hosseinzadeh, Mahdi | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41115 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Sadati, Nasser
Abstract:
Automatic control of depth of anesthesia is an important problem in biomedical engineering. The main challenging problem in anesthesia automation is inter-patients differences which is referred to as uncertainty and is crucial in robust controller design. One of the most appropriate tools in designing robust controllers is H_∞ concept. Furthermore, H_2 concept is used to reject the measurement noise which is unavoidable in practical cases. In this project we use mixed H_2/H_∞ concept to design robust controller for depth of anesthesia. Multi-model controller is another approach to design robust controller for depth of anesthesia, which reject measurement noise and also cover the inter-patients uncertainty. For this purpose, the large set of uncertainty is divided into several segments which correspond to subsystems modeling the groups of patients. For each group, a nominal model is assigned and the robust controller is applied using soft switching algorithm. The implementation of both controllers on different groups of patients are fully investigated and the results are compared. The simulation results show that both controllers can be used practically in clinical environments
Keywords:
Anesthesia Depth ; Robust Control ; Robust Proportional-Integral-Derivative (PID)Controller ; Multimodel System