The paper presents results achieved during realization of the international project DAMADICS (Development and Application of Methods for Actuator Diagnosis in Industrial control Systems). The proposed fault detection ...
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In this paper, a high performance control applied to speed control of interior permanent magnet synchronous motors. The design strategy is performed with constraint on the power factor, i.e., the power factor is maxim...
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This paper presents closed-loop stability results for the control of unconstrained nonlinear systems using the model predictive control methodology with semidefinite costs. The results do not require the use of a loca...
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This paper presents closed-loop stability results for the control of unconstrained nonlinear systems using the model predictive control methodology with semidefinite costs. The results do not require the use of a local control Lyapunov function as the terminal cost. The key assumptions are that the value function is bounded by a K/sub /spl infin// function of some measure of the state and that this measure is detectable through the stage cost. Sufficient conditions to yield semiglobal practical (and global) MPC stability results are given. In each case, a minimum horizon (uniform for global results) is determined for which the MPC method will result in the stabilization of a desired set.
For dynamical systems expressed in state-space form or for systems with non-classical damping, the reduction of the structural model into the modal co-ordinales involves complex modal analysis with complex modal co-or...
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In this paper by using a controller based on a neural network and an estimator, an efficient method in A/F ratio for SI engines is presented. This combined method improves plant performance effectively and provides ro...
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In this paper by using a controller based on a neural network and an estimator, an efficient method in A/F ratio for SI engines is presented. This combined method improves plant performance effectively and provides robustness against disturbances due to work point changing. It is shown that by combining two separate methods, a useful control strategy may be generated. Simulation results reveal the superiority of this method.
In this paper a model based nonlinear controller for a Gas MetaJ Arc Welding (GMAW) system is designed. The controller uses nonlinear stale feedback to exactly linearize and decouple the GMAW system. The linearized sy...
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In this paper, first we survey Fault Detection and Isolation (FDI) for nonlinear systems. A necessary condition for the problem to be solvable is derived in terms of an unobservability distribution, which is computabl...
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A sliding mode controller is employed to improve the robust performance of the position control of an induction motor in response to mechanical parameter uncertainty or load torque variations. In this paper a discrete...
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The main contribution of the paper is an output-feedback application in the inertia wheel pendulum (IWP). Due to the absence of a separation principle, it is necessary to design control laws that guarantee robustness ...
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The main contribution of the paper is an output-feedback application in the inertia wheel pendulum (IWP). Due to the absence of a separation principle, it is necessary to design control laws that guarantee robustness against the observer error. We present a design, which renders the system iISS with respect to the observer error and, hence, ensures robustness when the error is exponentially decaying. The advantage of our design over the observer-based backstepping scheme is that we employ nonlinear damping terms, which grow slower than those in (A toolkit for nonlinear feedback design, 1989), (Singular perturbations and input-to-state stability, 1996), and result in a "softer" control law.
Iterative median filtering for restoration of images corrupted by impulsive noise is considered. A modified version of median filtering that can be also applied iteratively is also proposed. The methods are compared w...
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Iterative median filtering for restoration of images corrupted by impulsive noise is considered. A modified version of median filtering that can be also applied iteratively is also proposed. The methods are compared with an iterative method suggested by Marvasti for images with high pixel loss. The results show that applying the median filter iteratively results in well sighted resulting images. Moreover, despite the implementation simplicity, the proposed modified median filtering scheme provides a considerably higher convergence speed which intends a lower numerical complexity.
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