# IET Control Theory & Applications

## Filter Results

Displaying Results 1 - 21 of 21
• ### Robust fault detection using polytope-based set-membership consistency test

Publication Year: 2012, Page(s):1767 - 1777
Cited by:  Papers (9)
| | PDF (1380 KB)

This article proposes a robust set-membership fault detection method based on the use of polytopes to bound the parameter uncertainty set. The algorithm is able to handle systems with bounded parameter variation between samples. It is shown that consistency checks indicating faults can be performed in a natural manner with a polytope description of the feasible parameter set. Finally, an applicati... View full abstract»

• ### Using a single bit to stabilise an n-dimensional quantised non-linear feedforward system

Publication Year: 2012, Page(s):1778 - 1786
Cited by:  Papers (1)
| | PDF (377 KB)

This study investigates the global asmptotic stabilisability of an n-dimensional quantised feedforward non-linear system. The system's dynamics are assumed to be locally Lipschitz. So the ranges of the state variables are tightly related to the parameters of the quantisation procedure, that is, there exists coupling between quantisation and control. To save network transmission bandwidth, l... View full abstract»

• ### Quad-rotors formation based on potential functions with obstacle avoidance

Publication Year: 2012, Page(s):1787 - 1802
Cited by:  Papers (8)
| | PDF (1004 KB)

This study proposes a formation control scheme for a group of quad-rotor aircrafts. The formation is realised by considering a constant altitude for the group of aircrafts. The authors propose a stability analysis that considers the aircraft group as a large-scale interconnected linear system in order to compute the value of the formation gain that guarantees its stabilisation. The control scheme ... View full abstract»

• ### Control and decision strategy for a class of Markovian jump systems in failure prone manufacturing process

Publication Year: 2012, Page(s):1803 - 1811
Cited by:  Papers (4)
| | PDF (390 KB)

This study investigates control and decision strategy for the failure prone manufacturing process, which is modelled as a two-mode Markovian jump system (MJS). Considering the historical effects on the system, the mode transition rate matrix (MTRM) is time-varying instead of homogeneous. A piecewise homogeneous MJS is thus proposed to characterise this phenomenon, in which the MTRM is homogeneous ... View full abstract»

• ### Model predictive quadrotor control: attitude, altitude and position experimental studies

Publication Year: 2012, Page(s):1812 - 1827
Cited by:  Papers (37)
| | PDF (1201 KB)

This study addresses the control problem of an unmanned quadrotor in an indoor environment where there is lack of absolute localisation data. Based on an attached inertia measurement unit, a sonar and an optic-flow sensor, the state vector is estimated using sensor fusion algorithms. A novel switching model predictive controller is designed in order to achieve precise trajectory control, under the... View full abstract»

• ### Adaptive decoupling switching control based on generalised predictive control

Publication Year: 2012, Page(s):1828 - 1841
Cited by:  Papers (1)
| | PDF (1456 KB)

This study introduces a multivariable adaptive decoupling control strategy using multiple models and neural networks for a class of discrete-time nonlinear dynamic systems. The adaptive decoupling switching control strategy based on generalised predictive control is composed of a linear adaptive decoupling controller, a neural-network-based nonlinear adaptive decoupling controller and a switching ... View full abstract»

• ### Robust control of observer-based sampled-data systems: digital redesign approach

Publication Year: 2012, Page(s):1842 - 1850
Cited by:  Papers (2)
| | PDF (429 KB)

This study proposes the digital redesign (DR) method for an observer-based output-feedback control in the presence of parametric uncertainties. The term DR is to convert an existing analogue control into an equivalent digital one in the sense of state-matching. The DR problem can be reduced to find the digital gains minimising the norm distance between the closed-loop states of the analogue and di... View full abstract»

• ### Neural network-based compensation control of mobile robots with partially known structure

Publication Year: 2012, Page(s):1851 - 1860
Cited by:  Papers (8)
| | PDF (626 KB)

This study proposes an inverse non-linear controller combined with an adaptive neural network proportional integral (PI) sliding mode using an on-line learning algorithm. The neural network acts as a compensator for a conventional inverse controller in order to improve the control performance when the system is affected by variations on their dynamics and kinematics. Also, the proposed controller ... View full abstract»

• ### Event-driven semi-Markov switching state-space control processes

Publication Year: 2012, Page(s):1861 - 1869
Cited by:  Papers (2)
| | PDF (322 KB)

Motivated by the optimisation of network communication systems, this paper presents a hierarchical analytical model for event-driven switching control of stochastic dynamic systems. First, the model called semi-Markov switching state-space control processes is introduced. The semi-Markov kernel and equivalent infinitesimal generator are constructed to characterise the hierarchical dynamics, and th... View full abstract»

• ### Detection and isolation of incipient sensor faults for a class of uncertain non-linear systems

Publication Year: 2012, Page(s):1870 - 1880
Cited by:  Papers (9)
| | PDF (385 KB)

The present study proposes a new scheme for detection and isolation of incipient sensor faults for a class of uncertain non-linear systems by combining sliding mode observers (SMOs) with a Luenberger observer. Initially, a state and output transformation is introduced to transform the original system into two subsystems such that the first subsystem (subsystem-1) has system uncertainties but is fr... View full abstract»

• ### Robust H2 control applied to boost converters: design, experimental validation and performance analysis

Publication Year: 2012, Page(s):1881 - 1888
Cited by:  Papers (17)
| | PDF (956 KB)

This study proposes a design procedure and experimental validation for a robust H2 state feedback controller applied to a DC-DC boost converter modelled as a linear system affected by time-varying parameters lying in known intervals. The parameters considered as time-varying are the input voltage, the load resistance and the operating point duty cycle. A polytopic representation of the ... View full abstract»

• ### Linear parameter-varying model identification with structure selection for autonomic web service systems

Publication Year: 2012, Page(s):1889 - 1898
| | PDF (724 KB)

Information technology (IT) systems must provide their users with prescribed quality of service (Qos) levels, usually defined in terms of application performance. Qos requirements are in general difficult to satisfy, since the system workload may vary by orders of magnitude within the same business day. To meet Qos requirements, resources have to dynamically be allocated among running applications... View full abstract»

• ### Self-tuning weighted measurement fusion Wiener filter for autoregressive moving average signals with coloured noise and its convergence analysis

Publication Year: 2012, Page(s):1899 - 1908
Cited by:  Papers (1)
| | PDF (387 KB)

For the multisensor single-channel autoregressive moving average (ARMA) signal with common coloured measurement noise, applying the modern time-series analysis method, based on the ARMA innovation model, the optimal weighted measurement fusion Wiener filter is presented. When the model parameters of coloured measurement noise and partial noise variances are unknown, by applying the recursive instr... View full abstract»

• ### Brief Paper - Non-quadratic local stabilisation for continuous-time Takagi-Sugeno fuzzy models: a descriptor system method

Publication Year: 2012, Page(s):1909 - 1917
Cited by:  Papers (2)
| | PDF (498 KB)

This study presents a descriptor system method to deal with the nonquadratic stabilisation design problem for continuous-time Takagi-Sugeno fuzzy models. Most of the previous results intended to establish global non-quadratic stabilisation conditions by bounding the time derivatives of membership functions (MFs). Those results are hard to uphold because of the difficulty of evaluating the bounds o... View full abstract»

• ### Brief Paper - Relaxed stabilisation criterion for discreteT-S fuzzy systems by minimum-type piecewise non-quadratic Lyapunov function

Publication Year: 2012, Page(s):1918 - 1925
Cited by:  Papers (6)
| | PDF (429 KB)

Piecewise Lyapunov functions and non-quadratic Lyapunov functions have been employed to analyse Takagi-Sugeno (T-S) fuzzy systems for getting relaxed results in the literature. Nevertheless, until now piecewise non-quadratic Lyapunov functions have not been used to design T-S fuzzy control systems. Motivated by the aforementioned concerns, this study utilises the minimum-type piecewise non-quadrat... View full abstract»

• ### Brief Paper - Sieve method for consensus-type network tomography

Publication Year: 2012, Page(s):1926 - 1932
Cited by:  Papers (8)
| | PDF (561 KB)

In this note, the authors examine the problem of identifying the interaction geometry among a known number of agents, adopting a consensus-type algorithm for their coordination. The proposed identification process is facilitated by introducing ports for stimulating a subset of network vertices via an appropriately defined interface and observing the network`s response at another set of vertices.... View full abstract»

• ### Brief Paper - L2-L∞ consensus control for high-order multi-agent systems with switching topologies and time-varying delays

Publication Year: 2012, Page(s):1933 - 1940
Cited by:  Papers (7)
| | PDF (388 KB)

This study is devoted to the L2-L∞ consensus problem for high-order multi-agent systems subjected to external disturbances. The network with time-varying delays is particularly taken into consideration under switching network topologies. By performing a model transformation, the consensus problem of the multi-agent systems is turned into a normal L... View full abstract»

• ### Brief Paper - Unknown input observer design for systems with monotone non-linearities

Publication Year: 2012, Page(s):1941 - 1947
Cited by:  Papers (3)
| | PDF (410 KB)

A non-linear unknown input observer (UIO) is designed for systems with non-linearities having lower bonds on their slopes. The observer is constructed such that the non-linearity in the observer error system satisfies a sector property. Based on this property rather than the Lipschitz property, an algorithm not limited by Lipschitz constant is proposed. Further, all the parameters in the proposed ... View full abstract»

• ### Brief Paper - Dynamic surface control for a class of state-constrained non-linear systems with uncertain time delays

Publication Year: 2012, Page(s):1948 - 1957
Cited by:  Papers (12)
| | PDF (612 KB)

The problem of tracking control for a class of uncertain time-delay non-linear system with state constraint is addressed. To prevent constraint violation, the tangent barrier Lyapunov function (TBLF) is firstly used for time-delay non-linear system. By ensuring boundedness of the TBLF in the closed loop, besides those limits are not transgressed, the authors also tackle scenarios wherein parametri... View full abstract»

• ### Brief Paper - Stabilisation of linear delay difference inclusions via time-varying control Lyapunov functions

Publication Year: 2012, Page(s):1958 - 1964
Cited by:  Papers (2)
| | PDF (264 KB)

The stabilisation of linear delay difference inclusions is often complicated by computational issues and the presence of constraints. In this study, to solve this problem, a receding horizon control scheme is proposed based on the Razumikhin approach and time-varying control Lyapunov functions. By allowing the control Lyapunov function to be time varying, the computational advantages of the Razumi... View full abstract»

• ### Brief Paper - Global set-point tracking control for a class of non-linear systems and its application in continuously stirred tank reactor systems

Publication Year: 2012, Page(s):1965 - 1971
Cited by:  Papers (1)
| | PDF (258 KB)

This study considers the global set-point tracking control problem for a class of non-linear systems with input-to-state stable dynamic uncertainties and unknown control coefficients. A partial-state feedback controller is proposed, which could achieve the global set-point tracking control of the system output and keep the other signals bounded. The overparameterisation is avoided with the help of... 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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