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International Conference on Artificial Intelligence in Renewable Energetic systems, IC-AIRES 2024

作者： Dahli, Khadidja Selam, Karim Cheggaga, Nawal Electrical and Remote Control Systems Laboratory LabSET Faculty of Technology University of Blida 1 Blida Algeria Process Control Laboratory Polytechnical National School Algiers Algeria

ISBN: (纸本)9783031803000

High temperatures pose several challenges for solar power generation in desert environments, such as decreased efficiency, increased resistance, thermal-induced degradation, and potential damage to the panels. This study aims to address these challenges by proposing a solar tracking system that manages excessive heat and does not require cooling systems or additional complex mechanisms. Instead, we present an innovative approach to protect solar systems from increased heat by integrating temperature data readings into conventional solar tracking tools. When the temperature exceeds the panel's recommended threshold, the tracker adjusts its position to misalign the panels from the sun and prevent damage. The system will resume regular tracking once the temperature drops below the critical value. Our research indicates that positioning the tracker vertically at 90° helps protect the panels from overheating and reduces dust accumulation. This innovation has the potential to enhance the performance and longevity of solar power systems in desert environments. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Cooling systems

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Stability and bifurcation analysis of delayed tri-trophic food chain model in poisoned environment with fear effect and additional food

Stability and bifurcation analysis of delayed tri-trophic fo...

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作者： Ramasamy, Sivasamy Banjerdpongchai, David Park, PooGyeon Center of Excellence in Intelligent Control Automation of Process Systems Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Electrical Engineering Pohang University of Science and Technology Pohang Korea Republic of

One of the most important goals of theoretical ecologists is to find a strategy for controlling the chaos in ecological models to maintain healthy ecosystems. We investigate the influence of fear and the supply of additional food to predators in a delayed tri-trophic food chain model, where interference among the species is determined by Holling type-II functional response. The proposed model incorporates the fact that the growth rates of prey and middle predators are decreased due to the fear of middle and special predators, respectively. The additional food is supplied to both predators by either nature or external agencies. Furthermore, the poisoned prey in the predator's environment is taken into account. In the proposed model, we use two time delays: one for the growth term of the middle predator and another for the gestation delay of the special predator. We determine the conditions for the existence of ecologically feasible equilibrium points and their local and global stability. In addition, we establish the conditions for the existence of Hopf bifurcation around interior equilibrium to seek periodic behavior in nondelayed and delayed models. Numerical investigations are performed to justify the proposed theoretical findings through phase portraits, time series of solutions, and bifurcation diagrams. We observe that the chaotic dynamics of a tri-trophic food chain model can be controlled by the proper choice of the fear effect and by supplying additional food parameters. As a result, our findings provide more ecological insights into the dynamics of the delayed tri-trophic food chain model with the fear effect and additional food supply. © 2023 John Wiley & Sons, Ltd.

关键词： Hopf bifurcation

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Kinetic study on the hydrogenation of dimethyl succinate to γ-butyrolactone

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RSC Advances 2025年第18期15卷 14307-14314页

作者： Du, Chengzhe Zhao, Chenghao Ma, Huixia Jiang, Rui Zhang, Huanling Zhou, Feng SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co. Ltd Dalian116100 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

The hydrogenation of dimethyl succinate (DMS) to γ-butyrolactone (GBL) is crucial in producing high-value chemicals for pharmaceuticals, agrochemicals, and battery electrolytes. This study utilized a self-developed copper-based catalyst and a micro-fixed bed reactor to systematically investigate the effects of temperature, pressure, and the hydrogen-to-ester ratio on reaction performance. An intrinsic kinetic model was developed based on experimental data, with reaction rate constants and activation energies determined through standard regression techniques. The model correlated well with observed data, providing insights into reaction kinetics. Validation against experimental data indicated fair agreement across various conditions. Sensitivity analysis confirmed the model's robustness, making it useful for process optimization. This kinetic analysis offers insights to enhance the efficiency and cost-effectiveness of industrial GBL production, aiming to improve overall process yield and efficiency. © 2025 The Royal Society of Chemistry.

关键词： Rate constants

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Fault Detection Unknown Input Observer for Local Nonlinear Fuzzy Autonomous Ground Vehicles System Based on a Joint Peak-to-Peak Analysis and Zonotopic Analysis Threshold

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 7226-7236页

作者： Li, Yi Dong, Jiuxiang Northeastern University State Key Laboratory of Synthetical Automation of Process Industries Shenyang110819 China Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China Liaoning Shenyang China

This paper focuses on the fault detection problem of local nonlinear fuzzy autonomous ground vehicles systems with disturbances by developing set membership estimation. The intractable influence of disturbances and local nonlinear part on the design of fault detection thresholds is the principal difficulty in fault detection using the existing set membership estimation methods. To this end, a fault detection unknown input observer via a novel joint peak-to-peak analysis and zonotopic analysis threshold is proposed. Firstly, the disturbances are divided into decouplable and non-decouplable parts. An unknown input observer, designed with peak-to-peak performance criteria, is employed to achieve the decoupling of the decouplable disturbance part. Subsequently, based on the dynamic structure of the observer, the local non-linear part is represented as polyhedra through peak-to-peak analysis and zonotopic analysis, thereby providing an interval estimation for the system output. his method utilizes zonotopic analysis to mitigate the over-estimation issue in the initial stage inherent in traditional peak-to-peak performance-based interval estimation techniques. Furthermore, it retains the necessary degrees of freedom during the decoupling process of certain disturbances to optimize the observer's performance. Consequently, this approach significantly enhances the accuracy of the interval estimation as compared to existing methods. Moreover, the peak-to-peak performance of fault detection unknown input observer is analysed using the fuzzy basis-dependent Lyapunov function to decrease the conservatism. Lastly, simulations are analysed in order to validate the accuracy of the proposed thresholds. © 1967-2012 IEEE.

关键词： Lyapunov functions

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An Integrated Sensor Fault Estimation and Fault-Tolerant control Design Approach for Continuous-Time Switched systems

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Journal of Dynamic systems, Measurement and control 2025年第4期147卷 041006页

作者： Elouni, Mohamed Hamdi, Habib Rabaoui, Bouali Rodrigues, Mickael Braiek, Naceur Benhadj Advanced Systems Laboratory National Higher Engineering School of Tunis ENSIT University of Tunis La Marsa2078 Tunisia Advanced Systems Laboratory Tunisian Polytechnic School University of Carthage La Marsa2078 Tunisia Automation and Process Engineering Laboratory IUT Lyon1 University of Lyon CNRS UMR 5007 Lyon69100 France

This paper proposes a robust integrated fault estimation (FE) and fault-tolerant control (FTC) strategy for a class of continuous-time switched systems in the presence of unknown external disturbances and sensor faults. The main idea focuses on designing a switched descriptor observer to achieve simultaneous estimations of system states and sensor faults. With the acquired estimation information, an integrated development of the estimated state feedback fault-tolerant controller is constructed to compensate for the fault effects by stabilizing the switched closed-loop system. Based on the average dwell time (ADT) concept and the Lyapunov-Krasovskii functional method, new and less conservative stability conditions are established with a prescribed H∞ performance level in a single-step linear matrix inequality (LMI) formulation. Finally, both a numerical example and a highly maneuverable aircraft technology (HiMAT) vehicle are provided to illustrate the effectiveness of the developed strategy. Copyright © 2025 by ASME.

关键词： Continuous time systems

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Robust Predictive Bipartite Bumpless control for Markov Jump MASs Under Switching Topology: Application to Rotary-Wing Air Vehicles

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 7020-7032页

作者： Wang, Jian Dong, Jiuxiang The Liaoning Province Key Laboratory of Safe Operation Technique for Autonomous Unmanned Systems College of Information Science and Engineering Shenyang110819 China Northeastern University State Key Laboratory of Synthetical Automation of Process Industries Shenyang110819 China

This article addresses the issue of bipartite consensus for Markov jump multi-agent systems subjected to bounded disturbance and input constraints under mode-dependent switching topology. To surmount the challenge of handling disturbance, hard constraints and bump suppression, which are not considered and difficult to deal with in existing literature on solutions to algebraic Riccati equation, a novel bipartite robust predictive bumpless control algorithm is proposed with integrating H∞ performance. To be specific, the offline designing process of bipartite controller parameters is firstly performed by investigating terminal constraint set and robust invariant set. In this sense, H∞ type cost function and consensus error state bump cost are constructed for achieving disturbance attenuation and suppressing bump in error state, respectively. This further avoids possible counterproductive results caused by setting constraints on bump with a small gain. Next, based on the optimization prediction dynamics, perturbation state of controller is optimized online for each agent, which efficiently reduces the computational burden compared with conventional online and efficient model predictive control. Furthermore, the recursive feasibility of the proposed method and stochastic stability of error dynamics are theoretically guaranteed. Finally, an application to rotary-wing air vehicles is utilized to verify the potential of theoretic results. © 1967-2012 IEEE.

关键词： Cost functions

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Global optimization of sensor installation angles for separating spindle error and roundness

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Precision engineering 2025年 95卷 364-378页

作者： Kang, Weimin Chen, Chong Zhong, Liuzhou Ruan, Jiahao Fu, Jianzhong State Key Laboratory of Fluid Power & Mechatronic Systems College of Mechanical Engineering Zhejiang University Hangzhou310027 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou310027 China

Measuring the motorized spindle's motion error and the rotating parts' roundness are of great significance in machining. However, these two errors are usually mixed in measurement, and separating them is a big challenge. The three-probe method is suitable for on-machine measurement because it does not require the movement of the sensor during measurement. However, there is the problem of harmonic suppression in the three-probe method and harmonic suppression is closely related to the sensor installation angle. This study studied the harmonic suppression phenomenon and gave two performance indicators for angle optimization, optimized the angles in global scope, and gave the best recommended values for the sensor installation angles. A special fixture was designed for precise angle measurement and adjustment, and a cross-correlation analysis method was adopted. Simulations were then created to simulate theoretical errors, rounding errors, and angular uncertainties. Finally, experiments were conducted to verify the discussed errors and results. © 2025 Elsevier Inc.

关键词： Strain measurement

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Ammonia as a Green Energy Carrier to Lower Blast Furnace CO2 Emissions

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ISIJ International 2025年第5期65卷 601-612页

作者： Mauret, Florent Ji, Jihong Kinzel, Peter Saxén, Henrik Baniasadi, Mehdi Green Iron Making Team Paul Wurth S.A. 32 Rue d’Alsace Gare Luxembourg1122 Luxembourg Process and Systems Engineering Åbo Akademi University Henrikinkatu 2 Turku20500 Finland

Green hydrogen is seen as crucial for the decarbonisation of the economy. Yet, some regions may lack local producing capability, necessitating hydrogen imports. Ammonia can be a cost-effective solution to indirectly transport hydrogen. Three concepts are presented for using ammonia as reductant in the Blast Furnace (BF) process. The first concept, called EASyMelt shaft, incorporates cracked ammonia into the furnace’s shaft. The second concept, NH3 EASyMelt, takes the changes a step further and injects cracked ammonia in both the bosh and shaft tuyeres. The cracked ammonia, heated by plasma torches, replacing hot blast and coal in the bosh tuyeres. Finally, NH3 EASyMelt is implemented with top gas recycling (TGR). The furnace operation under these scenarios is compared to conventional operation using a multi-phase BF process model. The CO2 emissions are found to be reduced by 15% for EASyMelt shaft, 60% for NH3 EASyMelt without TGR and 55% with it. The new concepts are also shown to have a significant impact on the thermal state, gas distribution, pressure drop and cohesive zone characteristics. The study sheds light on how ammonia could be integrated into the BF process, and the expected impact on the furnace thermochemical state and the CO2 emissions. © 2025 The Iron and Steel Institute of Japan.

关键词： Steelmaking

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Superhydrophobic ceramic membrane coupled with a biphasic solvent for efficient CO_(2)capture

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Green Energy & Environment 2025年第4期10卷 834-844页

作者： Kaili Xue Zhen Chen Xiaona Wu Heng Zhang Haiping Chen Junhua Li State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Beijing Key Laboratory of Pollutant Monitoring and Control in Thermoelectric Production Process School of EnergyPower and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing102206China

An innovative strategy was proposed by integration of membrane contactor(MC)with biphasic solvent for efficient CO_(2) capture from flue *** accessible fly ash-based ceramic membrane(CM)underwent hydrophobic modification through silane grafting,followed by fluoroalkylsilane decoration,to prepare the superhydrophobic membrane(CSCM).The CSCM significantly improved resistance to wetting by the biphasic solvent,consisting of amine(DETA)and sulfolane(TMS).Morphological characterizations and chemical analysis revealed the notable enhancements in pore structure and hydrophobic chemical groups for the modified *** of wetting/bubbling behavior based on static wetting theory referred the liquid entry pressure(LEP)of CSCM increased by 20 kPa compared to pristine *** with traditional amine solvents,the biphasic solvent presented the expected phase *** experiments demonstrated that the CO_(2) capture efficiency of the biphasic solvent increased by 7%,and the electrical energy required for desorption decreased by 32%.The 60-h continuous testing and supplemental characterization of used membrane confirmed the excellent adaptability and durability of the *** study provides a potential approach for accessing hydrophobic ceramic membranes and biphasic solvents for industrial CO_(2) capture.

关键词： Carbon capture Membrane contactor Hydrophobic modification Membrane wetting Biphasic solvent

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Observer-Based H∞ Fault-Tolerant Tracking control of Multi-Agent systems With Nonideal Communication Links and External Disturbances

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IEEE Transactions on Automation Science and engineering 2025年 22卷 14096-14107页

作者： Lin, Huichao Dong, Jiuxiang Park, Ju H. Northeastern University College of Information Science and Engineering Liaoning Province Key Laboratory of Safe Operation Technique for Autonomous Unmanned Systems State Key Laboratory of Synthetical Automation of Process Industries Shenyang110819 China Yeungnam University Department of Electrical Engineering Gyeongsan38541 Korea Republic of

This paper studies the problem of robust H∞ active fault-tolerant tracking control for multi-agent systems (MASs) under nonideal communication links and external disturbances. Unlike most existing studies that assume idealized or simplified communication links, such as uniform constant or time-varying delays, this paper considers a more realistic communication scenario involving non-uniform time-varying communication delays. The communication cases discussed encompass existing common communication scenarios as special cases. To achieve active fault-tolerant control, an intermediate variable-assisted proportional-integral observer (PIO) is introduced to estimate the system’s state and faults. Based on fault estimation values and considering non-ideal communication constraints, a fault-tolerant control scheme is designed to achieve the leader-follower tracking control objectives. With the help of Lyapunov theory and matrix inequality method, sufficient criteria are proposed for co-designing the observer and controller gains. Finally, two simulation examples verify the effectiveness of the theoretical results. © 2004-2012 IEEE.

关键词： Delay control systems

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