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Adaptive Input Delay Compensation Under Event-Based Control Signal Implementation

Abstract

In the context of an event-based control paradigm, when the controller-to-plant channels are subject to event-driven time sampling, a new scheme of feedback model reference adaptive control is developed. The developed scheme can cope with multiple distinct input and state time delays in the dynamics description and mitigate the effect of uncertainties due to both the traditional and network-induced phenomena. The underlying idea is based on a suitable equivalent reformulation of the plant model. In this way, it is possible to pull the input delay out of the design control law. The synthesized controller is demonstrated by applying it to perimeter urban traffic control.

article Article

date_range 2024

language English

link Link of the paper

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Haddad Jack

Mirkin Boris

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Featured Keywords

Delays

Adaptive control

Detectors

Perturbation methods

Delay effects

Adaptation models

Uncertainty

Event-based adaptive control

uncertain time-delay systems

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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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