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In this paper a new algorithm for discrete-time sliding mode control using only output samples is proposed. It is shown that the output feedback gain can be directly obtained using the reaching law of discrete-time sliding mode control. The main contribution of this work is that instead of using the system states, the output samples are used for designing the controller.
This paper proposes an algorithm for periodic output feedback (POF) control for Delta operator systems. The Delta operator creates the rapprochement between analog and discrete dynamic system models and establishes the natural framework to investigate the behavior of discrete dynamic models with fast sampling rates. It is shown here that, the periodic output feedback control fails for discrete-time...
In this paper, a suboptimal flow controller design for connection-oriented communication network via reduced model is proposed. Network is modeled as an nth order discrete system whose available bandwidth variations at the bottlenecked link act as an exogenous unmatched disturbance. The proposed scheme is characterized by a simple first order design which is applied to nth order systems through aggregation...
A new approach is presented to analyze sliding mode control in discrete-time systems using an established reaching law, whereby the ultimate band is obtained to be lesser than any previous analysis done with the same reaching law. Also, the controller parameters are evaluated according to the ultimate band that is desired. The approach begins with defining several bands in the space of the surface...
Whenever we compute control using digital computer, the states measured need to be converted to digital word before processing in the computer. This conversion gives rise to quantization error in state measurement which in turn affects the applied control to the plant. This would cause the system dynamics to deviate from the behaviour predicted by any theoretical analysis which does not consider the...
This paper presents an interesting application of magnetic levitation system using discrete sliding mode control. There is a limited literature available for sliding mode control as applied to magnetic levitation system. In this work a model of linearized magnetic levitation system having small magnetic disc and cylinder with light weight is considered. As a part of review PD control and full state...
The paper presents the design of discrete-time chatter free sliding mode control for the two-time-scale full system using the slow subsystem. It has been shown that a sliding mode control designed for the slow subsystem gives similar performance for the full system. Also, the obtained state feedback based control is converted into output feedback based control using fast output sampling approach....
Though continuous-time sliding mode control has a variety of desirable properties, its discrete-time counterpart does not guarantee the same performance. This is due to the fact that most of the discrete-time sliding mode control algorithms are based on reaching laws that are only approximations of continuous-time reaching laws and thus may not give a performance close to continuous-time sliding mode...
The sliding mode control systems (SMCS) for which the switching variable is designed independent of the initial conditions are known to be sensitive to parameter variations and extraneous disturbances during the reaching phase. For second order systems this drawback is eliminated by using the moving switching line technique where the switching line is initially designed to pass the initial conditions...
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