Browsing by Author "MALEM Hani"

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    ANALYSIS AND DETECTION OF FAULTS IN A COMBINED CYCLE POWER PLANT
    (National higher scool of technology and engineering-Annaba, 2025) MALEM Hani; BENLEULMI Hani Abderrahim; DJELLAD Abdelhak (Encadrant)
    In order to improve the performance of industrial processes and prevent efficiency losses caused by technical faults in power plants, it is imperative to have a high-performance monitoring system. There are a lot of methods for diagnosing and detecting faults that have been developed, and in our cas we are using a method that combines two main techniques (coupling diagnosis method), based on wavelet decomposition and Wavelet Energy Entropy (WEE) for feature extraction from sensor signals, and Support Vector Machine (SVM) or Random Forest (RF) for fault classification. This work was implemented by MATLAB software, Wavelet Toolbox for signal decomposition, with Machine Learning Toolbox and TreeBagger for classification.
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    Robust Cascade Control of Gas Turbines in the Presence of Sensor Faults
    (National Higher School of Technology and Engineering - Annaba, 2025) MALEM Hani; BENLEULMI Hani abderrahim
    This thesis presents a robust control strategy for gas turbine systems using a cascade control structure designed to withstand sensor faults and time delays. The study focuses on the combustion chamber subsystem, where temperature regulation is critical to system safety and efficiency. A mathematical model with two interconnected loops : temperature and gas flow is developed to simulate sensor failure and delay scenarios. To ensure system stability under these conditions, the Lyapunov-Krasovskii functional method combined with Linear Matrix Inequalities (LMIs) is applied to derive sufficient stability conditions. The proposed approach allows for the synthesis of a state-feedback controller capable of maintaining performance despite sensor inaccuracies and communication-induced delays. Simulation results confirm the effectiveness of the control design in stabilizing the system and mitigating the effects of faults.