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Resilient Design of Leader-Follower Consensus Against Cyber-Attacks

Abstract

This article focuses on the development of a resilient cooperative control system for leader-follower consensus problems prone to external cyber-attacks. The attackers are assumed to adversely impact data integrity and privacy by: 1) injecting unknown bounded exogenous signals to actuators and 2) eavesdropping on the physical states of followers. To mitigate the adverse effects of such attacks on the consensus, privacy, and stability of leader-follower systems, we develop a resilient cooperative control system by introducing virtual states interconnected with the physical states in such a way that the leader-follower consensus is guaranteed under unknown false data injection cyber-attacks. The dynamics of the virtual states act as a dynamical output mask, which maps the physical states of followers to some virtual states that are exchanged via a communication network. A Lyapunov-based design framework is proposed to guarantee stability and the leader-follower consensus against cyber-attacks. The decentralized design of the control variables in the proposed resilient cooperative control approach facilitates creating a plug-and-play environment, where follower nodes can easily be plugged in/out. The effectiveness of the theoretical results is evaluated using several numerical examples and implementation on a planar robot experimental testbed.

article Article

date_range 2024

language English

link Link of the paper

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Sadabadi Mahdieh

Atman Made

Aynala Anirudh

Gusrialdi Azwirman

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Featured Keywords

Cyberattack

Cooperative systems

Control systems

Actuators

Robot sensing systems

Symmetric matrices

Resilience

Cyber-attacks

leader-follower consensus

privacy preservation

resilient cooperative control

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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