Secure Control of Networked Switched Systems with Random DoS Attacks via Event-triggered Approach
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ISSN:1598-6446 eISSN:2005-4092 http://www.springer.com/12555
Secure Control of Networked Switched Systems with Random DoS Attacks via Event-triggered Approach Yonghui Liu Abstract: This paper considers security control of networked switched systems in which the denial-of-service attacks may happen when the output information is transmitted from the sensor to the controller. Besides, it is assumed that the denial-of-service obeys Bernoulli distribution. First, to reduce the communication burden and retaining a satisfactory performance, an event-triggered sampling mechanism is adopted. And then, security control of the switched systems is analyzed by designing an output-feedback controller and a switching signal based on the average dwell time method. It is shown that the state trajectory can be driven onto a certain bound despite the presence of the random denial-of-service attacks. Finally, a numerical example is given to demonstrate the effectiveness of the proposed method. Keywords: Average dwell time, event-triggered control, random denial-of-service attacks, switched systems.
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INTRODUCTION
Switched systems, as an important kind of hybrid systems, are consisted of a number of subsystems (or modes) and a switching signal orchestrating the switching sequence. In engineering control systems, switched systems provide an effective way of modeling physical systems that are displaying switching features, such as networked control systems, flight control systems, and robot control systems [1]. In addition, owing to the existence of the switching signal, the dynamic characters are more complex. From both theoretical and practical points of view, switched systems have attracted considerable attention in the field of stability analysis and control synthesis [2–5]. In the research of switched systems, the stability analysis is always the main issue that has been extensively investigated (see [6–8] and the references therein). Nowadays, with the development of computer technology, more and more control systems are executed through communication links [9, 10]. In such control systems, the issue of energy-saving is especially important since the communications among a large number of nodes may consume lots of energies. Hence, the event-triggered control strategy is developed in the digital implementation of the real time control systems, in which the current signal is transmitted only if certain triggering condition is satisfied [11]. Compared with the traditional periodic sample control scheme, such an event-triggered control scheme could reduce the communication burden and improve the resource utilization efficiency. In recent years, to solve the problem of energy-saving, much attention has been
been paid on the the event-triggered control strategy (see [12–15] and the reference therein). Among them, Li et al. [15] investigates the fault detection for nonlinear discretetime networked systems under an event-triggered scheme. Recently, the event-triggered approach has been employed to solve state estimation problems in
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