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# IET Control Theory & Applications

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Displaying Results 1 - 18 of 18
• ### Robust stability for discrete-time uncertain singular markov jump systems with actuator saturation

Publication Year: 2011, Page(s):255 - 262
Cited by:  Papers (8)
| | PDF (154 KB)

In this study, the robust stochastic stability problem for discrete-time uncertain singular Markov jump systems with actuator saturation is considered. A sufficient condition that guarantees that the discrete-time singular Markov jump systems with actuator saturation is regular, causal and stochastically stable is established. With this condition, for full and partial knowledge of transition proba... View full abstract»

• ### Simultaneous closed-loop automatic tuning method for cascade controllers

Publication Year: 2011, Page(s):263 - 270
Cited by:  Papers (4)
| | PDF (331 KB)

A new automatic tuning method for cascade control systems is presented. The technique consists in estimating the parameters of the primary and secondary process simultaneously by evaluating a closed-loop set-point step response. Then, based on the estimated model, the two proportional-integral-derivative controllers are tuned by applying an internal model control strategy. A performance assessment... View full abstract»

• ### Robust fault-tolerant control for spacecraft attitude stabilisation subject to input saturation

Publication Year: 2011, Page(s):271 - 282
Cited by:  Papers (14)
| | PDF (724 KB)

This study investigates the robust fault-tolerant attitude control of an orbiting spacecraft with a combination of unknown actuator failure, input saturation and external disturbances. A fault-tolerant control scheme based on variable structure control is developed that is robust to the partial loss of actuator effectiveness, where the actuators experience a reduced actuation but are still active.... View full abstract»

• ### State feedback integral control of networked control systems with external disturbance

Publication Year: 2011, Page(s):283 - 290
Cited by:  Papers (3)
| | PDF (409 KB)

This study addresses the stabilisation problem for a class of networked control systems (NCSs) with time delays and packet losses. Motivated by the fact that static state feedback control shows offset in the plant output when non-zero disturbance acts on NCSs, the proposed method emphasises the implementation issue and employs state feedback integral control to achieve non-zero disturbance rejecti... View full abstract»

• ### Path programming control strategy of quantum state transfer

Publication Year: 2011, Page(s):291 - 298
Cited by:  Papers (3)
| | PDF (251 KB)

The state transfer of closed quantum systems in the interaction picture is studied. The convergent problem encountered in designing control laws based on the Lyapunov method is solved by the well constructed observable operator and a path programming control strategy. It is proved that the condition for the target state being a stable point in the Lyapunov's sense is the coherent vectors of the ob... View full abstract»

• ### Mixed H2/H∞ approach to fault-tolerant controller design for lipschitz non-linear systems

Publication Year: 2011, Page(s):299 - 307
Cited by:  Papers (2)
| | PDF (400 KB)

This study is concerned with the design of fault-tolerant controller for Lipschitz non-linear continuous-time systems in the presence of disturbances and noises. The simultaneous estimation of actuator faults and states is formulated as a mixed H2/H∞ control problem. The fault-tolerant controller is then designed to compensate for the effect of the faults by stabilisin... View full abstract»

• ### Synchronisation of chaotic systems via reduced observers

Publication Year: 2011, Page(s):308 - 314
Cited by:  Papers (4)
| | PDF (316 KB)

This study treats synchronisation problem of chaotic systems from a novel point of view, by using a change of coordinates to transform chaotic systems into a common canonical form, for which the synchronisation problem can be easily studied via reduced observer. Sufficient and necessary conditions are given and the proposed method is illustrated by the synchronisation of Rössler chaotic sy... View full abstract»

• ### Differential stability and design of reduced-order observers for non-linear systems

Publication Year: 2011, Page(s):315 - 322
Cited by:  Papers (4)
| | PDF (275 KB)

In this study, differential stability is introduced for non-linear systems, and this concept is further exploited in reduced-order observer design for non-linear systems with non-linearities of unmeasured state variables, a more general class of non-linear systems than the systems with linear observer errors. It has been shown that if the dynamics of unmeasured state variables under a state transf... View full abstract»

• ### Optimal state-feedback design for non-linear feedback-linearisable systems

Publication Year: 2011, Page(s):323 - 333
| | PDF (530 KB)

This paper addresses the problem of optimal state-feedback design for a class of non-linear systems. The method is applicable to all non-linear systems which can be linearised using the method of state-feedback linearisation. The alternative is to use linear optimisation techniques for the linearised equations, but then there is no guarantee that the original non-linear system behaves optimally. T... View full abstract»

• ### Essential instability and essential destabilisation of linear stochastic systems

Publication Year: 2011, Page(s):334 - 340
Cited by:  Papers (5)
| | PDF (158 KB)

As a supplement for stochastic stability and stabilisation, new notions called essential instability and essential destabilisation are introduced. Moreover, necessary and sufficient conditions for essential instability and essential destabilisation are given. View full abstract»

• ### Plant input-mapping-based predictive control of systems through band-limited networks

Publication Year: 2011, Page(s):341 - 350
Cited by:  Papers (1)
| | PDF (475 KB)

A new control method for network-based control systems, with guaranteed closed-loop stability, is proposed. The method substantially enhances the conventional networked model-based predictive control (NMBPC) schemes. In conventional NMBPC methods, associated with a pre-specified range of possible time delays, a vector of stabilising control signals is determined and transmitted to the plant side o... View full abstract»

• ### Design of a robust position feedback tracking controller for flexible-joint robots

Publication Year: 2011, Page(s):351 - 363
Cited by:  Papers (5)
| | PDF (765 KB)

This article addresses the problem of designing robust tracking controls for a class of robotic manipulators with flexible joints that use only position measurements. This class of flexible-joint robots is perturbed by time-varying parametric uncertainties and external disturbances. A reduced-order observer is constructed to estimate the velocity signals, and then an observer-based robust position... View full abstract»

• ### Non-linear and adaptive control of a refrigeration system

Publication Year: 2011, Page(s):364 - 378
Cited by:  Papers (4)
| | PDF (1451 KB)

In a refrigeration process heat is absorbed in an evaporator by evaporating a flow of liquid refrigerant at low pressure and temperature. Controlling the evaporator inlet valve and the compressor in such a way that a high degree of liquid filling in the evaporator is obtained at all compressor capacities ensures a high energy efficiency. The level of liquid filling is indirectly measured by the su... View full abstract»

• ### Iterative learning control: quantifying the effect of output noise

Publication Year: 2011, Page(s):379 - 388
Cited by:  Papers (2)
| | PDF (567 KB)

Fixed parameter iterative learning control (ILC) for linear-time invariant, single-input single-output systems subject to output noise is analysed with the intent of predicting the expectation of the underlying noise-free mean square error (Euclidean norm) of the time series on each iteration. Explicit formulae are obtained in terms of the lifted matrix models of the plant. Computational exper... View full abstract»

• ### Brief paper periodic formations of multivehicle systems

Publication Year: 2011, Page(s):389 - 396
Cited by:  Papers (6)
| | PDF (430 KB)

The question of how to prescribe desired global behaviours for a system of interconnected agents through the application of only simple and local interactions has both theoretical and practical significance. In recent years, numerous papers have appeared in the control systems literature on the reconfiguration and stabilisation of multivehicle formations. This study describes a unique kind of asym... View full abstract»

• ### Brief paper continuous-time controlled markov chains with safety upper bound

Publication Year: 2011, Page(s):397 - 401
| | PDF (106 KB)

This study introduces the notion of safety for the controlled Markov chains in the continuous-time horizon. The concept is a non-trivial extension of safety control for stochastic systems modelled as discrete-time Markov decision processes, where the safety means that the probability distributions of the system states will not visit the given forbidden set at any time. In this paper study a unit-i... View full abstract»

• ### Brief paper swarm stability of high-order linear time-invariant swarm systems

Publication Year: 2011, Page(s):402 - 408
Cited by:  Papers (14)
| | PDF (365 KB)

In this study the swarm stability problem of high-order linear time-invariant (LTI) swarm systems with directed graph topology is dealt with. Consensus can be regarded as a specific type of swarm stability problem. Necessary and sufficient conditions for both swarm stability and consensus are presented. These conditions depend on the graph topology, the dynamics of agents and the interactions amon... View full abstract»

• ### Brief paper state-feedback gain design for a class of relay control systems

Publication Year: 2011, Page(s):409 - 419
| | PDF (617 KB)

In this paper, an approach to design state-feedback gain is proposed for a class of relay control systems. The resulting controller can drive states of the systems to desired limit cycles. The design consists of two steps. First, the form of the state-feedback gain is proposed. It is proved that each gain in the proposed form can guarantee the existence and stability of a limit cycle. Then, by an ... View full abstract»

## Aims & Scope

IET Control Theory & Applications is devoted to control systems in the broadest sense, covering new theoretical results and the applications of new and established control methods.

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