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An algebraic detection approach for control systems under multiple stochastic cyber-attacks Li, Yumei ; Voos, Holger ; et al in IEEE/CAA Journal of Automatica Sinica (2015), 2(3), 258-266 In order to compromise a target control system successfully, hackers possibly attempt to launch multiple cyberattacks aiming at multiple communication channels of the control system. However, the problem ... [more ▼] In order to compromise a target control system successfully, hackers possibly attempt to launch multiple cyberattacks aiming at multiple communication channels of the control system. However, the problem of detecting multiple cyber-attacks has been hardly investigated so far. Therefore, this paper deals with the detection of multiple stochastic cyber-attacks aiming at multiple communication channels of a control system. Our goal is to design a detector for the control system under multiple cyberattacks. Based on frequency-domain transformation technique and auxiliary detection tools, an algebraic detection approach is proposed. By applying the presented approach, residual information caused by different attacks is obtained respectively and anomalies in the control system are detected. Sufficient and necessary conditions guaranteeing the detectability of the multiple stochastic cyber-attacks are obtained. The presented detection approach is simple and straightforward. Finally, two simulation examples are provided, and the simulation results show that the detection approach is effective and feasible. [less ▲] Detailed reference viewed: 88 (17 UL)Effects of Permanent Bounded Cyber-Attacks on Networked Control Systems Gerard, Benjamin ; Voos, Holger ; Li, Yumei et al in 23rd Mediterranean Conference on Control and Automation (MED) (2015, June 16) In this paper, the problem of permanent bounded cyber-attacks on networked control systems is treated. After a characterisation of malicious cyber attacks, the danger of permanent bounded cyber-attacks of ... [more ▼] In this paper, the problem of permanent bounded cyber-attacks on networked control systems is treated. After a characterisation of malicious cyber attacks, the danger of permanent bounded cyber-attacks of two types is proved, the step attacks on system with invariant zero with zero real part and the free attacks. Simulation examples demonstrate the obtained results. [less ▲] Detailed reference viewed: 130 (7 UL)An application of linear algebra theory in networked control systems: stochastic cyber-attacks detection approach Li, Yumei ; Voos, Holger ; et al in IMA Journal of Mathematical Control and Information (2015) Based on the traditional linear algebra theory, this paper propose the attack detection schemes for networked control systems (NCSs) under single stochastic cyber-attack and multiple stochastic cyber ... [more ▼] Based on the traditional linear algebra theory, this paper propose the attack detection schemes for networked control systems (NCSs) under single stochastic cyber-attack and multiple stochastic cyber-attacks aiming at multiple communication channels of NCSs, respectively. The focus is on designing an anomaly detector for NCSs under cyber-attacks. First, we construct a model of stochastic NCSs with stochastic cyber-attacks which satisfy the Markovian stochastic process. And we also introduced the stochastic attack models that NCSs are possibly exposed to. Next, based on the frequency-domain transformation technique and linear algebra theory, we propose the algebraic detection schemes for possible stochastic cyber-attacks. We transform the detector error dynamics into algebraic equations. By applying the presented approaches, residual information that is caused by different attacks is, respectively, obtained and anomalies on the control system are detected. In addition, sufﬁcient and necessary conditions guaranteeing the detectability of the stochastic cyber-attacks are obtained. The presented detection approaches in this paper are simple, straightforward and easy to implement. The aim of this work is to use traditional mathematics tools to solve new problems that arise from the complex NCSs. Finally, two simulation examples are provided. The simulation results underline that the detection approaches are effective and feasible in practical application. [less ▲] Detailed reference viewed: 89 (6 UL)Uncertainty Quantification of Exponential Synchronization for a Novel Class of Complex Dynamical Networks with Hybrid TVD Using PIPC Pan, Lin ; Voos, Holger ; Li, Yumei et al in Control and Decision Conference (CCDC), 2015 27th Chinese (2015, May 23) Detailed reference viewed: 120 (21 UL)Nonlinear protocols for distributed consensus in directed networks of dynamic agents Li, Yumei ; Voos, Holger ; in Journal of the Franklin Institute (2015), 352(9), 3645-3669 This paper deals with the distributed consensus problem of multi-agent systems. While existing work mainly considers the design of linear protocols, we derive nonlinear protocols for directed networks of ... [more ▼] This paper deals with the distributed consensus problem of multi-agent systems. While existing work mainly considers the design of linear protocols, we derive nonlinear protocols for directed networks of dynamic agents with ﬁ xed and switched topologies, respectively. The obtained nonlinear protocols have the same effectiveness as the existing linear protocols, however they can satisfy the input constraints of real world physical systems, as well as the state value restrictions of agents, which ensure the smooth communication of the whole network and the correct data transmission among agents under the limited bandwidth. In contrast to most existing approaches that commonly use the Lyapunov function theory in order to prove the consensus problem, simple and effective mathematical methods are developed here for this purpose. Based on the equivalent in ﬁ nitesimal functions and differentials as well as linear approximations as comparatively simple mathematical tools, we prove that the distributed consensus is asymptotically reachable and derive the group decision values. For balanced topology structures, these nonlinear protocols in particular guarantee that the agents asymptotically reach an average-consensus. Furthermore, the obtained protocols relax the constraints on the communication links among the agents. Finally, simulations comprising the vertical alignment maneuver of a team of unmanned aerial vehicles (UAVs) and the phase synchronization of three oscillators are studied, respectively. The simulation results underline that the developed nonlinear protocols are effective and feasible for distributed consensus in directed networks of dynamic multi-agent systems. [less ▲] Detailed reference viewed: 130 (15 UL)A Stochastic Cyber-Attack Detection Scheme for Stochastic Control Systems Based on Frequency-Domain Transformation Technique Li, Yumei ; Voos, Holger ; in Au, Man ho (Ed.) International Conference on Network and System Security, NSS 2014, Xi'An, China, 15-17 October 2014 (2014, October 15) Based on frequency-domain transformation technique, this paper proposes an attack detection scheme for stochastic control systems under stochastic cyber-attacks and disturbances. The focus is on designing ... [more ▼] Based on frequency-domain transformation technique, this paper proposes an attack detection scheme for stochastic control systems under stochastic cyber-attacks and disturbances. The focus is on designing an anomaly detector for the stochastic control systems. First, we construct a model of stochastic control system with stochastic cyber-attacks which satisfy the Markovian stochastic process. And we also introduced the stochastic attack models that a control system is possibly exposed to. Next, based on the frequency-domain transformation technique and linear algebra theory, we propose an algebraic detection scheme for a possible stochastic cyber-attack. We transform the detector error dynamic equation into an algebraic equation. By analyzing the rank of the stochastic matrix E(Q (z0)) in the algebraic equation, residual information is obtained and anomalies in the stochastic system are detected. In addition, sufﬁcient and necessary conditions guaranteeing the detectability of the stochastic cyber-attacks are obtained. The presented detection approach in this paper is simple, straightforward and more ease to implement. Finally, the results are applied to some physical systems that are respectively subject to a stochastic data denial-of-service (DoS) attack and a stochastic data deception attack on the actuator. The simulation results underline that the detection approach is efﬁcient and feasible in practical application. [less ▲] Detailed reference viewed: 92 (9 UL)Robust H ∞ cyber-attacks estimation for control systems Li, Yumei ; Voos, Holger ; in Proceedings of the 33rd CCC, Nanjing 28-30 July 2014 (2014, July 28) This paper deals with the robust H ∞ cyber-attacks estimation problem for control systems under stochastic cyber-attacks and disturbances. The focus is on designing a H ∞ lter which maximize the attack ... [more ▼] This paper deals with the robust H ∞ cyber-attacks estimation problem for control systems under stochastic cyber-attacks and disturbances. The focus is on designing a H ∞ lter which maximize the attack sensitivity and minimize the effect of disturbances. The design requires not only the disturbance attenuation, but also the residual to remain the attack sensitivity as much as possible while the effect of disturbance is minimized. A stochastic model of control system with stochastic cyber-attacks which satisfy the Markovian stochastic process is constructed. And we also present the stochastic attack models that a control system is possibly exposed to. Furthermore, applying H ∞ ltering technique-based on linear matrix inequalities (LMIs), the paper obtains suf cient conditions that ensure the ltering error dynamic is asymptotically stable and satis es a prescribed ratio between cyber-attack sensitivity and disturbance sensitivity. Finally, the results are applied to the control of a Quadruple-tank process (QTP) under a stochastic cyber-attack and a stochastic disturbance. The simulation results underline that the designed lters is effective and feasible in practical application. [less ▲] Detailed reference viewed: 74 (6 UL)A model predictive approach for cyber-attack detection and mitigation in control systems Voos, Holger ; Li, Yumei ; in The 52nd IEEE Conference on Decision and Control (2013, December 10) The paper presents a new approach for control security. Speciﬁcally, cyber-attacks on the controller are in- vestigated by means of optimization techniques in order to determine the worst-case scenario ... [more ▼] The paper presents a new approach for control security. Speciﬁcally, cyber-attacks on the controller are in- vestigated by means of optimization techniques in order to determine the worst-case scenario. Then, a novel attack detector based on limit checking is introduced. The particularity of this detector is that no speciﬁc controller knowledge is necessary. Hence, the vulnerability of the detector can be reduced since no reconﬁguration is required (limited accessibility). Finally, the paper shows that the effect of the attacks on the system can be signiﬁcantly mitigated by applying proper optimal control laws [less ▲] Detailed reference viewed: 63 (6 UL)Robust Exponential Stability criteria of Uncertain Stochastic Systems with Time-varying Delays Li, Yumei ; ; in International Journal of Systems Science (2011), 42(4), 601-608 This paper investigates the problem of delay-dependent exponential stability in mean square for continuous-time linear stochastic systems with structured uncertainties and time-varying delays. By applying ... [more ▼] This paper investigates the problem of delay-dependent exponential stability in mean square for continuous-time linear stochastic systems with structured uncertainties and time-varying delays. By applying descriptor model transformation of the systems, a new type of Lyapunov-Krasovskii functional is constructed, and by introducing some free weighting matrices, some new delay-dependent and delay-independent stability criteria are respectively derived in terms of LMI algorithm. the new stability criteria are less conservative than existing results. Numerical examples demonstrate the new criteria are effective and are an improvement over existing results. [less ▲] Detailed reference viewed: 44 (3 UL)Unbiased H∞ Infinite Filtering for Stochastic Systems with Data Packet Losses Li, Yumei ; ; in Advanced Materials Research (2011), 204-210 This paper presents the unbiased H∞ filter design for stochastic systems with data packet losses. By constructing unbiased filter, the complexity and computational burden of the real-time filtering ... [more ▼] This paper presents the unbiased H∞ filter design for stochastic systems with data packet losses. By constructing unbiased filter, the complexity and computational burden of the real-time filtering process are reduced greatly. Delay-dependent sufficient conditions for stochastic system with data packet losses are proposed in terms of linear matrix inequalities (LMIs). Numerical example demonstrates the proposed approaches are effective. [less ▲] Detailed reference viewed: 47 (8 UL)Nonlinear Protocols for Output Performance Value Consensus of Multi-Agent Systems Li, Yumei ; ; in The 30th Chinese Control Conference (2011) This paper investigates output performance value consensus issue, which is a new necessarily considered issue for cooperative and coordinate control of multi-agent systems with fixed topology. Based on ... [more ▼] This paper investigates output performance value consensus issue, which is a new necessarily considered issue for cooperative and coordinate control of multi-agent systems with fixed topology. Based on Lyapunov theory, this paper presents nonlinear protocols for output performance value consensus of systems and proves the asymptotic consensus is reachable. Simulation example shows the nonlinear protocols are effective for output performance value consensus of multi-agent systems [less ▲] Detailed reference viewed: 39 (3 UL)Delay-dependent robust H∞ filtering for linear stochastic systems with uncertainties Li, Yumei ; ; in Chinese Journal of Systems Engineering and Electronics (2010), 32(1), 152-157 This paper investigates the robustH∞ filtering problem for continuous –time linear stochastic systems with time-vary state delay and parameter uncertainty. The aim is to design a linear filter such that ... [more ▼] This paper investigates the robustH∞ filtering problem for continuous –time linear stochastic systems with time-vary state delay and parameter uncertainty. The aim is to design a linear filter such that the filtering error dynamics system is exponentially stable in mean square and assuring a prescribedH∞ performance level .Applying the descriptor model transformation, construct a new Lyapunov-Krasovskii functional . By introducing some free weighting matrices, avoiding any product term of Lyapunov matrices and system matrices，so it is not necessary for system matrices to do any constraint in the process of the design of filters, to a great extent , which make the design of filters have less conservative. For system without uncertainty and with uncertainty case, to guarantee the existence of desired robust H∞ filters, sufficient conditions are proposed respectively in terms of linear matrix inequalities (LMIs), The results obtained are less conservative than existing ones. Numerical examples demonstrate the proposed approaches are effective and are an improvement over previous ones. [less ▲] Detailed reference viewed: 34 (1 UL)Delay-dependent exponential stability criteria for stochastic systems with polytopic-type uncertainties Li, Yumei ; ; et al in Journal of Control Theory and Applications (2009), 7(3), 291-296 This paper considers the problem of delay-dependent exponential stability in mean square for continuous-time linear stochastic systems with polytopic-type uncertainties and time-varying delay. Based on ... [more ▼] This paper considers the problem of delay-dependent exponential stability in mean square for continuous-time linear stochastic systems with polytopic-type uncertainties and time-varying delay. Based on linear matrix inequalities (LMIs), applying the descriptor model transformation and introducing free weighting matrices, a new type of Lyapunov-Krasovskii functional is constructed and some new delay-dependent and delay-independent exponential stability criteria are respectively obtained. The results include the delay-independent/rate-dependent and delay-dependent/rate-independent exponential stability criteria. The new criteria are less conservative than existing ones. Numerical examples demonstrate the new criteria are effective and are an improvement over existing ones. [less ▲] Detailed reference viewed: 58 (2 UL)Unbiased H∞ filtering for a class of stochastic systems with time-varying delay Li, Yumei ; ; in The 21st annual international conference on Chinese control and decision conference (2009) This paper presents the unbiased H∞ filter design for a class of stochastic systems with time-varying delay. The aim is to design an unbiased filter assuring exponential stability in mean square and a ... [more ▼] This paper presents the unbiased H∞ filter design for a class of stochastic systems with time-varying delay. The aim is to design an unbiased filter assuring exponential stability in mean square and a prescribed H∞ performance level for the filtering error system. Based on the application of the descriptor model transformation and free weighting matrices, delay-dependent sufficient conditions for stochastic systems with time-varying delay are proposed respectively in terms of linear matrix inequalities(LMIs). Numerical examples demonstrate the proposed approaches are effective and are an improvement over existing methods. [less ▲] Detailed reference viewed: 17 (0 UL)Nonlinear consensus protocols for multi-agent systems based on centre manifold reduction Li, Yumei ; in Chinese Physics B (2009), 18(8), 3355-3366 This paper investigates nonlinear consensus protocols for dynamic directed networks of multiagent systems with fixed and switching topology, respectively. Based on center manifold reduction technic ... [more ▼] This paper investigates nonlinear consensus protocols for dynamic directed networks of multiagent systems with fixed and switching topology, respectively. Based on center manifold reduction technic, nonlinear consensus protocols are presented. We prove a group of agents can reach a ¯¡consensus , which the group decision value varies from the minimum and the maximum values of the agents’ initial states. Moreover, we derive conditions to guarantee all agents reach a consensus on a desired group decision values. Finally, A simulation study concerning the vertical alignment maneuver of a team of unmanned air vehicles is performed. Simulation results show the nonlinear consensus protocols proposed are more effective than the linear protocols for the formation control of the agents and it is an improvement over existing protocols. [less ▲] Detailed reference viewed: 54 (2 UL)参数不确定的非线性随机时滞系统的H∞滤波 Li, Yumei ; in Chinese Journal of Systems Engineering and Electronics (2008), 30(9), 1730-1734 This paper investigates a robust H∞ filtering problem for a class of nonlinear stochastic system with time-delay and parameter uncertainty. Assume the parameter uncertainty is norm-bounded and the system ... [more ▼] This paper investigates a robust H∞ filtering problem for a class of nonlinear stochastic system with time-delay and parameter uncertainty. Assume the parameter uncertainty is norm-bounded and the system dynamic is modeled by Ito-type stochastic differential equations. The aim of this work is to design a linear, delayless, uncertainties independent state estimator such that for all admissible uncertainties as well as exogenous disturbances, the dynamics of the estimation error is stochastically exponential stable in mean square and independent of the time-delay. For system with single delay and multiple delay case, sufficient conditions are proposed respectively to guarantee the existence of desired robust H∞ filters via linear matrix inequalities(LMI). Numerical example is presented to demonstrate the effectiveness of the proposed approachs. [less ▲] Detailed reference viewed: 42 (5 UL)H∞ Filtering of 2-D FM LSS Model with State Delays ; ; Li, Yumei et al in The 27th Chinese Control Conference (2008) In this paper, we deal with H∞ filtering problem for a class of two-dimensional (2-D) discrete time-invariant systems with state delays described by local state-space (LSS) Fornasini-Marchesini (FM ... [more ▼] In this paper, we deal with H∞ filtering problem for a class of two-dimensional (2-D) discrete time-invariant systems with state delays described by local state-space (LSS) Fornasini-Marchesini (FM) second model. Based on the bounded real lemma of 2-D state-delayed systems, H∞ filtering design is developed, such that the filtering error system is asymptotically stable and has H∞ performance via LMIs’ feasibility. Furthermore, the minimum H∞ norm bound can be obtained by solving a linear objective optimization problem. A numerical example is given to demonstrate the effectiveness and advantage of our result. [less ▲] Detailed reference viewed: 35 (0 UL)Exponential Stability Criteria for Uncertain Stochastic Systems Li, Yumei ; ; et al in The 27th Chinese Control Conference (2008) This paper considers the problem of delay-dependent exponential stability in mean square for a class of stochastic systems with polytopic-type uncertainties and time-varying delay. Based on the ... [more ▼] This paper considers the problem of delay-dependent exponential stability in mean square for a class of stochastic systems with polytopic-type uncertainties and time-varying delay. Based on the application of the descriptor model transformation and free weighting matrices to express this relationship among the system variables and among the terms in the Newton-Leibniz formula, some new delay-dependent exponential stability criteria are obtained in terms of linear matrix inequalities(LMIs). The new criteria are less conservative than existing ones. Numerical examples demonstrate the new criteria are effective and are an improvement over existing ones. [less ▲] Detailed reference viewed: 29 (0 UL)H∞ filtering for stochastic time- delay systems Li, Yumei ; ; et al in The 7th World Congress on Intelligent Control and Automation (2008) This paper presents the robust H∞ filter design for stochastic systems with time-varying delay. The aim is to design a stable linear filter assuring exponential stability in mean-square and a prescribed ... [more ▼] This paper presents the robust H∞ filter design for stochastic systems with time-varying delay. The aim is to design a stable linear filter assuring exponential stability in mean-square and a prescribed H∞ performance level for the filtering error system. Based on the application of the descriptor model transformation and free weighting matrices, delaydependent sufficient conditions are respectively proposed in terms of linear matrix inequalities(LMIs). Numerical example demonstrates the proposed approaches are effective and are an improvement over existing ones. [less ▲] Detailed reference viewed: 31 (6 UL)Robust H∞ Filtering for a Class of Uncertain Nonlinear Stochastic Time-delay Systems Li, Yumei ; in Control Science and Engineering : Academic Forum of China PHD Students (2007) The paper investigates a robust H∞ filtering design problem for a class of uncertain nonlinear stochastic time-delay system with state and exogenous disturbance-dependent noise. Assume the parameter ... [more ▼] The paper investigates a robust H∞ filtering design problem for a class of uncertain nonlinear stochastic time-delay system with state and exogenous disturbance-dependent noise. Assume the parameter uncertainty is norm-bounded and the system dynamic is modeled by Ito-type stochastic differential equations. The aim of this work is to design a linear, delayless, uncertainties independent state estimator such that for all admissible uncertainties as well as exogenous disturbances, the dynamics of the estimation error is stochastically exponential stable in mean square and independent of the time-delay. Sufficient conditions are proposed to guarantee the existence of desired robust H∞ filtering via linear matrix inequalities (LMI). Numerical example is presented to demonstrate the effectiveness of the proposed approaches. [less ▲] Detailed reference viewed: 34 (3 UL) |
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