# IET Control Theory & Applications

## Filter Results

Displaying Results 1 - 16 of 16
• ### Leaderless output consensus of multi-agent systems with distinct relative degrees under switching directed topologies

Publication Year: 2019, Page(s):313 - 320
| | PDF (2205 KB)

In the existing literatures, almost all the consensus protocols are designed for multi-agent systems with identical orders. In practice, the multi-agent systems are likely to be composed of agents with distinct orders. This study investigates the leaderless output consensus problem for heterogeneous non-linear multi-agent systems with distinct relative degrees under switching directed topologies f... View full abstract»

• ### Non-fragile finite-time dissipative piecewise control for time-varying system with time-varying delay

Publication Year: 2019, Page(s):321 - 332
| | PDF (3319 KB)

This study is concerned with the problem of non-fragile finite-time dissipative (FTD) control for time-varying system with delay. The delay is time varying and belongs to a given interval. Finite-time bounded (FTB) and FTD concepts are introduced to time-varying system with delay. First, new FTB conditions are derived for time-varying system with delay by using a piecewise Lyapunov functional comb... View full abstract»

• ### New approach to robust observer-based control of one-sided Lipschitz non-linear systems

Publication Year: 2019, Page(s):333 - 342
| | PDF (1654 KB)

This study investigates the problem of robust observer design for a class of one-sided non-linear continuous-time systems with parameter uncertainties and $L_{2}$L2 bounded admissible external disturbance. The one-sided Lipschitz and quadratically inner-bounded conditions have been utilised to derive less conservative synthesis condition for the observer design. The corresponding design methodolog... View full abstract»

• ### Weighted L2 gain performance controller parameterisation of linear switching plants with average dwell time

Publication Year: 2019, Page(s):343 - 350
| | PDF (1380 KB)

This study addresses the problem of weighted L2 performance controller parameterisation for a plant switching among a finite family of given configurations. It is assumed that switching is a piecewise constant function of time and obeys an average dwell time switching logic. With a multiple Lyapunov functions-based technique, a dynamical switching output-feedback controller is solved wi... View full abstract»

• ### Input-to-state stability for non-linear switched stochastic delayed systems with asynchronous switching

Publication Year: 2019, Page(s):351 - 359
| | PDF (1121 KB)

In this study, the input-to-state stability (ISS), stochastic-ISS and integral-ISS problems for a class of switched stochastic systems with time delays are studied. A continuously differentiable Lyapunov-Krasovskii function with an indefinite derivative is employed to derive the ISS-type properties of the systems. Two cases are considered: (i) synchronous switching, i.e. candidate controllers coin... View full abstract»

• ### Kronecker weights for instability analysis of Markov jump linear systems

Publication Year: 2019, Page(s):360 - 366
| | PDF (805 KB)

In this study, the authors analyse the instability of continuous-time Markov jump linear systems. Although there exist several effective criteria for the stability of Markov jump linear systems, there is a lack of methodologies for verifying their instability. In this study, they present a novel criterion for the exponential mean instability of Markov jump linear systems. The main tool of the auth... View full abstract»

• ### Bayesian approach to identify Hammerstein–Wiener non-linear model in presence of noise and disturbance

Publication Year: 2019, Page(s):367 - 376
| | PDF (1502 KB)

In this study, a recursive algorithm is presented for identification of both linear and non-linear blocks of the Hammerstein-Wiener (H-W) models. An iterative sampling schema is used, along with non-parametric describing of non-linear functions by Gaussian processes, to consider the Gaussian distributed noise and disturbances. Different aspects of solving the H-W problem are discussed, covering th... View full abstract»

• ### Distributed fault estimation design of interconnected systems with external disturbances

Publication Year: 2019, Page(s):377 - 386
| | PDF (2397 KB)

In this study, a new distributed fault estimation observer (DFEO) design method is proposed based on unknown input observer (UIO) for interconnected systems with external disturbances. The coupling terms among interconnected subsystems are utilised to construct DFEO. At the same time, according to the characteristics of UIO, external interference is completely decoupled to improve the robustness o... View full abstract»

• ### Fault detection for vehicle active suspension systems in finite-frequency domain

Publication Year: 2019, Page(s):387 - 394
| | PDF (1203 KB)

This study solves a new fault detection strategy for vehicle active suspension systems in finite-frequency domain. Three fault detection filters are constructed in different finite frequency domains, which ensure that the error between residuals and faults is minimum. The H∞ filter problem is used to figure out the design problem of fault detection. The conditions of residual systems me... View full abstract»

• ### Exponential synchronisation of complex networks with delays and perturbations via impulsive and adaptive control

Publication Year: 2019, Page(s):395 - 402
| | PDF (1677 KB)

This study considers exponential synchronisation of complex networks (CNs) with time-varying delays and non-identical perturbations by using hybrid control schemes. Quantised adaptive control and quantised impulsive control are combined, and 1-norm-based analytical techniques are wielded. By using hybrid quantised controller, applying 1-norm-based analytical methods, and designing new Lyapunov fun... View full abstract»

• ### Further study on local analysis of continuous-time T-S fuzzy models with bounded disturbances

Publication Year: 2019, Page(s):403 - 410
| | PDF (1193 KB)

This study further addresses the problem of computing the bounds of disturbances for continuous-time Takagi-Sugeno (T-S) fuzzy models. First, in order to bound the time derivatives of the membership functions, less conservative results, which overcome some drawbacks of the previous results such as special structure of free variable, redundant restrictive conditions and parameters, are obtained by ... View full abstract»

• ### Closed-loop parameter identification of second-order non-linear systems: a distributional approach using delayed reference signals

Publication Year: 2019, Page(s):411 - 421
| | PDF (4496 KB)

This work presents a closed-loop parameter identification algorithm for a class of second-order non-linear systems affected by constant disturbances, quantisation, and state estimation errors. The proposed scheme permits obtaining a linear parameterisation of the non-linear system by developing a simplified procedure that allows using the distributional framework approach straightforwardly. The pa... View full abstract»

• ### Augmented fixed-time observer-based continuous robust control for hypersonic vehicles with measurement noises

Publication Year: 2019, Page(s):422 - 433
| | PDF (2173 KB)

This study is concerned with the augmented fixed-time observer based adaptive super-twisting cruise control for flexible air-breathing hypersonic vehicles (FAHVs). First, the input-output linearisation technique is employed to derive a control oriented FAHV dynamic model. Then, a super-twisting controller is designed to track the reference velocity and altitude commands when faced with various unc... View full abstract»

• ### Lag-bipartite consensus of linear multiagent systems under saturating input over signed graph

Publication Year: 2019, Page(s):434 - 443
| | PDF (3527 KB)

The objective of this study is to investigate lag-bipartite consensus of linear multiagent systems under saturating input with dead-zone constraint where two separate groups of follower agents reach the modulus of the leader state, but of opposite sign with a certain delay. The leader-follower bipartite consensus problem of saturating input with dead-zone is considered with the input signals of th... View full abstract»

• ### Signal-to-noise ratio constrained feedback control: discrete-time robust stability analysis

Publication Year: 2019, Page(s):444 - 450
| | PDF (1317 KB)

The explicit consideration of a communication channel model in a feedback control loop is known to introduce a fundamental limitation on the feedback control loop stabilisability in the form of a channel signal-to-noise ratio lower bound whenever the plant model is unstable. In this study, the authors study these type of limitations subject to model uncertainties, either from the plant model or th... View full abstract»

• ### Tuning of a time-delayed controller for a general class of second-order linear time invariant systems with dead-time

Publication Year: 2019, Page(s):451 - 457
| | PDF (2697 KB)

In this study, the problem of σ-stabilising a general class of second-order linear time invariant systems with dead-time using a proportional-integral-retarded (PIR) controller is considered. The σ-stability of a system determines the exponential decay in its response. Here the σ-stability of the closed-loop system is ensured by assigning up to four dominant real roots at -σ. For the tuning of the... 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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