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Leader-Following Consensus for Incremental Quadratic Constrained Nonlinear Multiagent Systems With Actuator Saturation

Abstract

This article considers the regional consensus problem for nonlinear multiagent systems subject to actuator saturation, and the nonlinear function is supposed to satisfy incremental quadratic constraints, which is a more completed characterization of nonlinearity. Compared with the traditional linear feedback control, a novel saturated nonlinear control protocol is generalized under the framework of composite Laplacian quadratics function. The introduction of the novel function makes the estimation on the domain of consensus larger than the existing Laplacian quadratic function-based methods. The sufficient conditions for the consensus of multiagent systems are derived by the forms of bilinear matrix inequalities, which cover the existing linear matrix inequality-based conditions as special cases. Finally, a numerical simulation case pertaining to aircraft illustrates the validity as well as the superiority of the proposed approach.

article Article

date_range 2024

language English

link Link of the paper

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Huang Jun

Xu Jing

Zhao Xudong

Yang Lin

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Featured Keywords

Protocols

Laplace equations

Control systems

Network systems

Actuators

Symmetric matrices

Multi-agent systems

Composite Laplacian quadratics

incremental quadratic constraints

regional consensus

saturated nonlinear control protocol

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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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