7,435 research outputs found
Input-to-State Stabilizing Control Under Denial-of-Service
The issue of cyber-security has become ever more prevalent in the analysis and design of networked systems. In this paper, we analyze networked control systems in the presence of denial-of-service (DoS) attacks, namely attacks that prevent transmissions over the network. We characterize frequency and duration of the DoS attacks under which input-to-state stability (ISS) of the closed-loop system can be preserved. To achieve ISS, a suitable scheduling of the transmission times is determined. It is shown that the considered framework is flexible enough so as to allow the designer to choose from several implementation options that can be used for trading-off performance versus communication resources. Examples are given to substantiate the analysis
On Resilient Control of Nonlinear Systems under Denial-of-Service
We analyze and design a control strategy for nonlinear systems under
Denial-of-Service attacks. Based on an ISS-Lyapunov function analysis, we
provide a characterization of the maximal percentage of time during which
feedback information can be lost without resulting in the instability of the
system. Motivated by the presence of a digital channel we consider event-based
controllers for which a minimal inter-sampling time is explicitly
characterized.Comment: 7 pages, 1 figur
Towards Stabilization of Distributed Systems under Denial-of-Service
In this paper, we consider networked distributed systems in the presence of
Denial-of-Service (DoS) attacks, namely attacks that prevent transmissions over
the communication network. First, we consider a simple and typical scenario
where communication sequence is purely Round-robin and we explicitly calculate
a bound of attack frequency and duration, under which the interconnected
large-scale system is asymptotically stable. Second, trading-off system
resilience and communication load, we design a hybrid transmission strategy
consisting of Zeno-free distributed event-triggered control and Round-robin. We
show that with lower communication loads, the hybrid communication strategy
enables the systems to have the same resilience as in pure Round-robin
Weak Resilience of Networked Control Systems
In this paper, we propose a method to establish a networked control system
that maintains its stability in the presence of certain undesirable incidents
on local controllers. We call such networked control systems weakly resilient.
We first derive a necessary and sufficient condition for the weak resilience of
networked systems. Networked systems do not generally satisfy this condition.
Therefore, we provide a method for designing a compensator which ensures the
weak resilience of the compensated system. Finally, we illustrate the
efficiency of the proposed method by a power system example based on the IEEE
14-bus test system
A virtual actuator approach for the secure control of networked LPV systems under pulse-width modulated DoS attacks
In this paper, we formulate and analyze the problem of secure control in the context of networked linear parameter varying (LPV) systems. We consider an energy-constrained, pulse-width modulated (PWM) jammer, which corrupts the control communication channel by performing a denial-of-service (DoS) attack. In particular, the malicious attacker is able to erase the data sent to one or more actuators. In order to achieve secure control, we propose a virtual actuator technique under the assumption that the behavior of the attacker has been identified. The main advantage brought by this technique is that the existing components in the control system can be maintained without need of retuning them, since the virtual actuator will perform a reconfiguration of the plant, hiding the attack from the controller point of view. Using Lyapunov-based results that take into account the possible behavior of the attacker, design conditions for calculating the virtual actuators gains are obtained. A numerical example is used to illustrate the proposed secure control strategy.Peer ReviewedPostprint (author's final draft
Stabilizing switching signals: a transition from point-wise to asymptotic conditions
Characterization of classes of switching signals that ensure stability of
switched systems occupies a significant portion of the switched systems
literature. This article collects a multitude of stabilizing switching signals
under an umbrella framework. We achieve this in two steps: Firstly, given a
family of systems, possibly containing unstable dynamics, we propose a new and
general class of stabilizing switching signals. Secondly, we demonstrate that
prior results based on both point-wise and asymptotic characterizations follow
our result. This is the first attempt in the switched systems literature where
these switching signals are unified under one banner.Comment: 7 page
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