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Cyber-physical systems under hybrid cyber-attacks: Resilient event-triggered H∞ control approach.

Sepideh Jahani VakilKandi1, Farhad Bayat1, Abolfazl Jalilvand1

  • 1Department of Electrical Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.

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Summary

This study presents an adaptive event-triggered finite-time H∞ control for cyber-physical systems facing disturbances, faults, and hybrid cyber-attacks. The novel approach enhances resource utilization and system stability under complex conditions.

Keywords:
Actuator faultsAdaptive event-triggered mechanismCyber-physical systemsFinite-time stabilityHybrid cyber-attacks

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Area of Science:

  • Control Systems Engineering
  • Cybersecurity
  • Robotics

Background:

  • Cyber-Physical Systems (CPSs) are vulnerable to disturbances, actuator faults, and sophisticated hybrid cyber-attacks.
  • Existing event-triggered mechanisms may not optimally balance resource utilization and performance under such complex scenarios.

Purpose of the Study:

  • To develop a novel adaptive event-triggered finite-time H∞ control approach for CPSs.
  • To address bounded disturbances, actuator faults, and hybrid cyber-attacks (aperiodic DoS, deception, replay).
  • To enhance resource utilization via an adaptive periodic event-triggered mechanism (APETM).

Main Methods:

  • A new theoretical framework for CPSs incorporating APETM under hybrid attacks, disturbances, and faults.
  • Lyapunov-Krasovskii stability theory to ensure finite-time stability with H∞ performance.
  • Linear Matrix Inequality (LMI) technique for controller gain and triggering parameter determination.

Main Results:

  • Sufficient conditions for finite-time stability with H∞ performance were established.
  • The APETM, using a DoS-dependent adaptive threshold, minimizes data transmission and increases event intervals.
  • Controller gains and triggering parameters were successfully determined using LMIs.

Conclusions:

  • The proposed adaptive event-triggered finite-time H∞ control effectively enhances CPS security and stability.
  • The method demonstrates robustness against hybrid cyber-attacks, disturbances, and actuator faults.
  • Simulations on a one-link flexible joint robot system validate the approach's effectiveness.