IET Control Theory & Applications
Volume 10, Issue 7, 25 April 2016
Volumes & issues:
Volume 10, Issue 7
25 April 2016
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- Author(s): Cheolhyeon Kwon and Inseok Hwang
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 731 –741
- DOI: 10.1049/iet-cta.2014.1013
- Type: Article
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p.
731
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This study considers robust controller design for cyber–physical systems (CPSs) subject to cyber attacks. While previous studies have investigated secure control by assuming specific attack strategies, in this study the authors propose a robust hybrid control scheme containing multiple sub-controllers, each matched to a different type of cyber attack. A system using this control scheme is able to adapt its behaviour to various cyber attacks (including those which have not been specifically addressed in the sub-controller designs) by switching sub-controllers to achieve the best performance. They propose a method for designing the secure switching logic to counter possible cyber attacks and to mathematically verify the system's performance and stability as well. The performance of the proposed control scheme is demonstrated by the hybrid H 2–H ∞ controller applied to a CPS subject to cyber attacks.
- Author(s): Zhuwei Wang ; Xiaodong Wang ; Lihan Liu
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 742 –751
- DOI: 10.1049/iet-cta.2015.0775
- Type: Article
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p.
742
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In this study, the design of the optimal decentralised state-feedback controllers is considered for a wireless sensor and actuator network (WSAN) with stochastic network-induced delays and packet losses. In particular, taking advantage of multiple controllers, the authors model the WSAN as a wireless networked control system with decentralised controllers, and then formulate the stochastic optimal state-feedback control problem as a non-cooperative linear quadratic game. The optimal control law of each controller is obtained that is a function of the current plant state and past control signals. The performance of the proposed algorithm is investigated by an unstable linearised inverted pendulum and an application of the load frequency control system in power grid.
- Author(s): Lijun Long and Jun Zhao
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 752 –761
- DOI: 10.1049/iet-cta.2015.0866
- Type: Article
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p.
752
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The problem of adaptive fuzzy output-feedback control for a class of switched uncertain non-linear systems without the measurements of the system states is discussed. By utilising fuzzy logic systems to approximate unknown non-linear functions, an adaptive fuzzy control technique for the problem under study is provided by exploiting the average dwell time method and the backstepping technique. To reduce the conservativeness caused by adoption of a common observer for all subsystems, a switched observer for switched systems is designed. It is proved that the proposed controllers of subsystems can guarantee the semiglobally uniformly ultimately bounded for all the closed-loop signals under a class of switching signals with average dwell time, while the output tracking error can converge to a small neighbourhood of the origin. The effectiveness of the proposed control scheme is illustrated by its application to a switched RLC circuit and a mass–spring–damper system.
- Author(s): Hongguang Fan ; Yi Zhao ; Jianwen Feng
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 762 –771
- DOI: 10.1049/iet-cta.2015.0690
- Type: Article
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p.
762
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This study investigates cluster synchronisation of non-linearly coupled impulsive networks with time-varying delay. Without loss of generality, it is assumed that the nodes in the networks to be non-identical and the coupling matrix to be asymmetric. Two kinds of topological structures are concerned, which correspond to positive weighted network, as well as cooperative and competitive network, respectively. Pinning controllers are designed in order to achieve cluster synchronisation. According to the Lyapunov stability theory, impulsive delay differential inequalities and linear matrix inequalities, some criteria for cluster synchronisation of non-linear impulsive dynamical systems are obtained. Two numerical examples are given to demonstrate the effectiveness of the authors' new results.
- Author(s): Yuxin Su and Chunhong Zheng
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 772 –779
- DOI: 10.1049/iet-cta.2015.0749
- Type: Article
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p.
772
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In this study, the authors propose a unified approach to saturated proportional derivative (SPD) controller design for asymptotic attitude stabilisation of spacecraft subject to actuator constraints. It is shown that a class of simple and high computation efficient SPD controller can ensure asymptotic stabilisation of spacecraft with actuator constraints. The proposed SPD controller utilises the general saturation function, and thus provides a unified framework for asymptotic stable control design of spacecraft subject to actuator constraints. Advantages of the proposed design framework include the intuitive structure, high computation efficiency, easy implementation and asymptotic stabilisation with the ability to ensure that actuator constraints are not violated. This is accomplished by selecting control gains a priori. Two examples are presented to demonstrate the effectiveness and the improved performance of the proposed approach.
- Author(s): Seong-Jin Park and Kwang-Hyun Cho
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 780 –788
- DOI: 10.1049/iet-cta.2015.1047
- Type: Article
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p.
780
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The authors study how n local supervisors with individual control objectives can achieve a common goal by modular control based on power in a hybrid system framework. Each local supervisor is an observer designed with its own objective for an approximated finite state machine of a hybrid plant based on the l-complete approximation scheme of Moor et al. in 2002. We present the notion of power observability of the common control objective and show that, if the common specification is controllable and power observable with respect to an approximated model, then n local supervisors can achieve the control objective of the hybrid plant. Then, we apply the proposed power-based modular control theory to the analysis of the financial crisis occurred in 2008. The power observability explains how the deregulation policies leading to the crisis could be pursued. While the small elite group of politicians and bankers could set the policies with inordinate power based on full information, most public people were ignorant and unconcerned about the policies, and hence did not oppose them.
- Author(s): Biao Xu ; Di Zhou ; Sheng Sun
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 789 –799
- DOI: 10.1049/iet-cta.2015.0199
- Type: Article
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789
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A novel guidance law utilising variable structure control with finite time sliding sector is proposed. In contrast with the normally used notion of asymptotic stability in conventional sliding sector, a finite time sliding sector is defined as a subset of state space in which the Lyapunov function candidate satisfies the finite time stability condition. For the guidance system, the analytical solution of a state-dependent differential Riccati equation is achieved to determine the finite time sliding sector. Then, based on the finite time sliding sector, a sliding sector guidance law is designed by considering the target acceleration as a bounded uncertainty. Furthermore, the finite time sliding sector guidance law is even extended to the case where missile acceleration saturation constraint is considered. Simulation results show that the new guidance law is highly effective.
- Author(s): Shuang Zhang ; Wei He ; Deqing Huang
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 800 –805
- DOI: 10.1049/iet-cta.2015.1044
- Type: Article
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p.
800
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In this study, the authors are concerned with the active vibration control of a flexible string system with input backlash. For vibration suppression, active control is applied at the right boundary of the flexible string. To deal with the input backlash, a novel ‘disturbance-like’ term is proposed in the control design. A physically motivated Lyapunov function is employed to design boundary control law to ensure the vibration suppression and guarantee the stability of the closed-loop system. Numerical simulations illustrate the effectiveness of the proposed control method.
- Author(s): Yaote Chang and Jyh-Horng Chou
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 806 –813
- DOI: 10.1049/iet-cta.2015.0783
- Type: Article
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p.
806
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An output sliding mode controller for a class of multi-input non-linear systems with non-linear mismatched perturbations is proposed by using the Lyapunov stability theorem to solve the regulation problems. An auxiliary dynamic equation is used to estimate unknown states and to depress non-linear perturbations in the control system. Design variables embedded in the auxiliary equation are utilised in the novel sliding surface so that asymptotic stability of controlled system can be achieved when the system is in the sliding mode. Finally, the feasibility of the proposed methodology is demonstrated in two examples, including a servo position control system.
- Author(s): Guang-Xin Zhong and Guang-Hong Yang
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 814 –824
- DOI: 10.1049/iet-cta.2015.0925
- Type: Article
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p.
814
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This study is devoted to simultaneous control and fault detection for discrete-time delay switched systems. In the persistent dwell time (PDT) switching framework, a more general switching law is designed, where the resulting PDT is dependent on the state delay. For delay switched systems, the result shows the relation between PDT and state delay. More importantly, it also includes the previous delay-independent results in special case. Next, under the switching law, the time-varying output-feedback-based controller/residual generators are provided such that the closed-loop system is with the non-weighted H _ index for fault and l 2-gain for disturbance. Compared with the existing method under the average dwell time switching, the method proposed here leads to better fault sensitivity. Finally, a simulation example is exploited to demonstrate the effectiveness of the proposed results.
- Author(s): Carlos Izaguirre-Espinosa ; Aldo Jonathan Muñoz-Vázquez ; Anand Sánchez-Orta ; Vicente Parra-Vega ; Pedro Castillo
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 825 –832
- DOI: 10.1049/iet-cta.2015.1048
- Type: Article
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p.
825
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Light weight quadrotors are highly manoeuvrable autonomous aerial robots (UAV) that outperform most UAVs; however, quadrotors are prone to a wide class of aerodynamic disturbances, vibrations, and uncertainties that demand not only robust but fast attitude control structures. These arguments are compelling enough to motivate the design of a novel fractional-order control scheme that enforces finite-time convergence of the sliding manifold to guarantee local exponential tracking. The controller does not exhibit chattering and does not require the knowledge of the dynamic model. The stability analysis is based on a proposed resetting memory principle to deal with memory effects of the differintegral operator, which allows the controller to tackle also robustness against continuous disturbances that are not necessarily differentiable in the conventional sense such as some aerodynamic phenomena. Experimental evidence is presented and discussed to expose the enforcement of the sliding manifold based on a fractional-order reaching phase that demonstrates the feasibility of the proposed control scheme.
Cyber attack mitigation for cyber–physical systems: hybrid system approach to controller design
Stochastic optimal linear control of wireless networked control systems with delays and packet losses
Adaptive fuzzy output-feedback control for switched uncertain non-linear systems
Cluster synchronisation in non-linearly coupled impulsive networks with non-identical nodes and time-varying delays
Unified saturated proportional derivative control framework for asymptotic stabilisation of spacecraft
Power-based supervisory control theory of hybrid systems and its application to the analysis of financial crisis
Finite time sliding sector guidance law with acceleration saturation constraint
Active vibration control for a flexible string system with input backlash
Design of the output sliding mode controller for MI non-linear perturbed systems
Simultaneous control and fault detection for discrete-time switched delay systems under the improved persistent dwell time switching
Attitude control of quadrotors based on fractional sliding modes: theory and experiments
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- Author(s): Chengcai Mei ; Lijun Zhu ; Zhiyong Chen
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 833 –837
- DOI: 10.1049/iet-cta.2015.1162
- Type: Article
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p.
833
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(5)
A class of feedback controllers has been proposed to achieve a desired locomotion behaviour for mechanical rectifier systems in recent work. It is inspired by a biological neuron circuit called central pattern generator and is expected to exhibit robust and adaptive abilities against system parameter uncertainties and external disturbances. The controller was originally designed in an ideal situation that system parameters such as friction coefficients were precisely known, and measurement channels and actuation circuits were noiseless. In this study, the authors conduct specific robustness analysis for the locomotion controller with respect to system parameter variations and measurement and actuation noises. The numerical study shows that the locomotion controller is able to maintain a reasonable performance under these circumstances.
- Author(s): Myunggon Yoon
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 838 –842
- DOI: 10.1049/iet-cta.2015.0905
- Type: Article
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p.
838
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(5)
This study deals with transfer functions of a multi-agent consensus system, composed of identical linear time-invariant dynamical agents. Motivated by the fact that stabilisation of a single agent in a multi-agent consensus system with an exogenous controller results in collective stability of all agents, the authors study transfer function representation of a controlled agent in a consensus system. It is shown that the transfer function order of a controlled agent is always greater than double the transfer function order of an isolated agent and that the smallest double order is realised if and only if a controlled agent has inter-agent connections with all other agents of a consensus system.
- Author(s): Yulong Huang ; Yonggang Zhang ; Ning Li
- Source: IET Control Theory & Applications, Volume 10, Issue 7, p. 843 –852
- DOI: 10.1049/iet-cta.2015.1092
- Type: Article
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p.
843
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(10)
In this study, the authors focus on estimating the unknown constant latency probability of non-linear systems with one-step randomly delayed measurements using maximum likelihood (ML) criterion. A new latency probability estimation algorithm is proposed based on an expectation maximisation approach to obtain an approximate ML estimation of latency probability. The proposed algorithm consists of expectation step (E-step) and the maximisation step (M-step). In the E-step, the expectation of the complete data log-likelihood function is approximately computed based on the currently estimated latency probability, and in the M-step, the approximate expectation is maximised using the Newton approach. The efficacy of the proposed algorithm is illustrated in a numerical example concerning univariate non-stationary growth model.
Robustness analysis of locomotion controllers for mechanical rectifier systems in natural oscillation
Minimal-order transfer functions of dynamical multi-agent consensus systems
Latency probability estimation of non-linear systems with one-step randomly delayed measurements
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