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Pseudospectral optimal control of active magnetic bearing systems
, Article Scientia Iranica ; Vol. 21, Issue. 5 , 2014 , pp. 1719-1725 ; ISSN: 10263098 ; Livani, M ; Sharif University of Technology
Abstract
In this paper, an optimal control framework is formed to control rotor-Active Magnetic Bearing (AMB) systems. The multi-input-multi-output non-affine model of AMBs is well established in the literature and represents a challenging problem for control design, where the design requirement is to keep the rotor at the bearing centre in the presence of external disturbances. To satisfy the constraints on the states and the control inputs of the AMB nonlinear dynamics, a nonlinear optimal controller is formed to minimize tracking error between the current and desired position of the rotor. To solve the resulted nonlinear constrained optimal control problem, the Gauss Pseudospectral Collocation...
Performance Evaluation of Adaptive PID Controllers
, M.Sc. Thesis Sharif University of Technology ; Shahrokhi, Mohammad (Supervisor) ; Vafa, Ehsan (Supervisor)
Abstract
The PID controller has been widely used in the industry for many years because of its simple structure and satisfactory performance. If the process is time-varying or has a nonlinear dynamic, the PID controller with constant parameters can not control the process in a wide range of operation and adaptive PID controller should be used. In this thesis, two adaptive controllers proposed in the literature, one for multi-input multi-output (MIMO) affine nonlinear systems and another for single-input single-output (SISO) non-affine nonlinear systems both in the normal form that both of them are extended in to the general form. The latter extended controller includes the MIMO systems. The main...