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Your search keyword '"Mohammed, Osama A."' showing total 40 results
Start Over Author "Mohammed, Osama A." Journal ieee transactions on industry applications
40 results on '"Mohammed, Osama A."'

1. Optimal Adaptive Ultra-Local Model-Free Control Based-Extended State Observer for PMSM Driven Single-Axis Servo Mechanism System

Author

El-Sousy, Fayez F. M., Amin, Mahmoud M., Soliman, Ahmed S., and Mohammed, Osama A.

Abstract

This paper proposes an optimal adaptive ultra-local model-free control (OAULMFC) scheme for servo-mechanism actuated through a permanent-magnet synchronous motor drive. Owing to the uncertainties in real-time applications, the model-based controller cannot achieve good dynamic performance. Therefore, an OAULMFC based on ultra-local model is developed. The proposed control scheme requires estimating the total disturbance and the control input gains. Therefore, the composite control structure of the OAULMFC combines an ultra-local model-free controller (ULMFC), a robust adaptive extended state observer (ESO) and an optimal ${{\mathcal{H}}_\infty }$ controller. The ESO is developed to estimate the total disturbance whereas the optimal ${{\mathcal{H}}_\infty }$ controller is adopted as the auxiliary controller to provide the optimal control performance of the servo mechanism. For enhancing the estimation accuracy, an online direct heuristic dynamic programming (DHDP) strategy is utilized for adaptation the ESO parameters and control input gains of the ULMFC. Accordingly, an actor-critic neural-networks with DHDP is adopted to solve the Hamilton-Jacobi-Bellman (HJB) equation online. Concurrently, the actor neural-network provides the optimal control performance. Furthermore, the system stability and convergence conditions via Lyapunov theory is proved. The experimental results confirmed the robustness of the proposed OAULMFC in case of model perturbations and external disturbances compared with the conventional ULMFC.

Published
2024
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6. A Cyber-HIL for Investigating Control Systems in Ship Cyber Physical Systems Under Communication Issues and Cyber Attacks

Author

Vu, Linh, Nguyen, Tung-Lam, Abdelrahman, Mahmoud S., Vu, Tuyen, and Mohammed, Osama A.

Abstract

This article presents a novel Cyber-Hardware-in-the-Loop (Cyber-HIL) platform for assessing control operation in ship cyber-physical systems. The proposed platform employs cutting-edge technologies, including Docker containers, real-time simulator $OPAL-RT$, and network emulator $ns3$, to create a secure and controlled testing and deployment environment for investigating the potential impact of cyber attack threats on ship control systems. Real-time experiments were conducted using an advanced load-shedding controller as a control object in both synchronous and asynchronous manners, showcasing the platform's versatility and effectiveness in identifying vulnerabilities and improving overall Ship Cyber Physical System (SCPS) security. Furthermore, the performance of the load-shedding controller under cyber attacks was evaluated by conducting tests with man-in-the-middle (MITM) and denial-of-service (DoS) attacks. These attacks were implemented on the communication channels between the controller and the simulated ship system, emulating real-world scenarios. The proposed Cyber-HIL platform provides a comprehensive and effective approach to test and validate the security of ship control systems in the face of cyber threats.

Published
2024
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