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20th International Multi-Conference on systems, Signals and Devices, SSD 2023

作者： Elouni, Mohamed Hamdi, Habib Rabaoui, Bouali Braiek, Naceur Benhadj Rodrigues, Mickael University of Carthage Advanced Systems Laboratory Polytechnic School of Tunisia La Marsa2078 Tunisia University of Lyon Automation and Process Engineering Laboratory Villeurbanne LyonF-69622 France

ISBN: (纸本)9798350332568

This paper considers the problem of designing a robust descriptor observer for simultaneous state and sensor faults estimation of continuous-time switched linear systems in the presence of unknown external disturbances. An augmented singular switched system is constructed from the original switched systems by considering the sensor faults term as a part of a new extended state vector. Stability conditions are established and formulated into H∞ performances by minimizing the effect of external disturbance from the residual and a Lyapunov stability theory is utilized for switched system stability combined with the Average Dwell Time (ADT) concept. The observer parameter matrices are also determined by solving a convex optimization problem under Linear Matrix Inequalities (LMI) constraints. Finally, a numerical example and a Highly MAneuverable Technology (HiMAT) vehicle are investigated to prove the efficacy of the obtained results. © 2023 IEEE.

关键词： Linear matrix inequalities

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On the Synthesis of an Integrated Active FTC Scheme for Continuous-Time Switched systems with Actuator Faults 6

On the Synthesis of an Integrated Active FTC Scheme for Cont...

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6th IEEE International Conference on Advanced systems and Emergent Technologies, IC_ASET 2023

作者： Elouni, Mohamed Hamdi, Habib Rabaoui, Bouali Braiek, Naceur BenHadj Rodrigues, Mickael School of Tunisia University of Carthage Advanced Systems Laboratory Polytechnic La Marsa2078 Tunisia University of Lyon Automation and Process Engineering Laboratory Villeurbanne LyonF-69622 France

ISBN: (纸本)9798350321029

The present paper aims to design an integrated state/fault estimation and fault tolerant control issues for switched systems affected by actuator fault and external disturbances. A switched adaptive state/fault estimation observer is proposed to simultaneously estimate the system state and actuator fault. Based on this observer, we develop a fault tolerant control law not only to stabilize the closed-loop system, but also to compensate the faults effects. Then, by using the switched Lyapunov function and Average Dwell Time (ADT) concept, some sufficient conditions are derived and applied to build the switched adaptive observer-based state feedback controller. The observer and controller gain matrices are also obtained by solving an optimization problem with Linear Matrix Inequality (LMI) constraints. Finally, simulation results of a switched electrical system are presented to illustrate the effectiveness of the proposed design methods. © 2023 IEEE.

关键词： Closed loop systems

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Impact of tool wear and fiber orientation on CFRP surface integrity: An experimental study with pre-wear PCD tools 3

Impact of tool wear and fiber orientation on CFRP surface in...

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3rd CIRP Conference on Composite Material Parts Manufacturing, CCMPM 2024

作者： Li, Jiongqi Wang, Chenglong Qiu, Ziyi Lin, Zhiwei Fu, Jianzhong State Key Laboratory of Fluid Power and 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

The machining of Carbon Fiber Reinforced Polymers (CFRP) presents substantial challenges in preserving surface integrity due to the material's pronounced anisotropy, high stiffness, and low thermal conductivity. These characteristics lead to significant tool wear, considerable thermal damage, and pronounced surface defects during the machining process. To assess the machining performance of Polycrystalline Diamond (PCD) tools under different wear conditions and fiber orientations, this article introduces an experimental study on the milling of T700 / epoxy CFRP components using pre-wear PCD tools. The CFRP workpieces were specially designed in a gear shape to minimize tool wear progression and facilitate subsequent measurements. The results, observed using a Scanning Electron Microscope (SEM), indicated variations in surface integrity related to tool wear progression. At zero Fiber Cutting Angles (FCAs), worn tool causes severer matrix peel up from the fiber. At acute FCAs, slightly worn tools produced a better surface finish than fresh tools due to matrix smearing, whereas severely worn tools resulted in chip adhesion and degraded surface quality. Down milling achieved greater surface integrity than up milling. Additionally, surface integrity was found more critical at low feed rates with severely worn tool. At obtuse FCAs, surface integrity was highly dependent on the feeding orientation, and was sensitive to tool wear. Up milling produced saw-tooth surface cavities at 150°FCA, while down milling showed significant cracks at 120° and 150°FCAs. The cutting force was more sensitive to tool wear progression at 30°, 60° and 90°FCAs, and less sensitive at 120° and 150°FCAs. Additionally, cutting forces were higher in up milling than in down milling, especially as tool wear progressed. These findings provide valuable insights for further research on optimizing CFRP machining processes to reduce tool wear and enhance component quality. © 2025 The Author(s).

关键词： Carbon fiber reinforced plastics

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Robust MPC with Support Vector Clustering-based Parametric Uncertainty Set for Building Thermal control

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IFAC-PapersOnLine 2024年第18期58卷 159-164页

作者： Ilham Naharudinsyah Rene Delfos Tamas Keviczky Process and Energy Department Faculty of Mechanical Engineering Delft University of Technology Delft 2628 CN Netherlands Process and Energy Department Faculty of Mechanical Engineering Delft University of Technology Delft 2628 CN Netherlands Delft Center of Systems and Control Faculty of Mechanical Engineering Delft University of Technology Delft 2628 CD Netherlands

control systems are essential to support the use of building structures as short-term thermal energy storage (TES). Due to modeling and forecast imperfections, the controller must be able to deal with uncertainties. This paper proposes a robust model predictive controller (MPC) with a new uncertainty set construction technique to regulate the heat supply in a building envelope. We extend the Support Vector Clustering-based set construction technique to estimate modeling and forecast uncertainty sets. Subsequently, we integrate the sets into a Min-Max MPC framework to ensure robust feasibility by tightening the constraints. The resulting controller successfully deals with modeling and forecast uncertainties. The quality of the presented framework is compared with a nominal MPC and a robust MPC with different uncertainty set estimates. On the basis of a numerical simulation, we demonstrate that the proposed controller successfully maintains the room temperature within the comfort limits. The result also shows that our MPC is less conservative than the controller designed using a box-shaped non-falsifed parametric uncertainty set.

关键词： Support vector clustering Set-membership estimation Parametric uncertainty Robust model predictive control Thermal energy storage Building energy systems

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Effect of Ca/Mg molar ratio on the calcium-based sorbents

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2182-2190页

作者： Yumeng Li Qing Zhao Xiaohui Mei Chengjun Liu Henrik Saxén Ron Zevenhoven Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819China Process and Systems Engineering Laboratory Åbo Akademi UniversityÅbo/Turku 20500Finland

Steelmaking industry faces urgent demands for both steel slag utilization and CO_(2)*** and Mg of steel slag can be extracted by acid solution and used to prepare sorbents for CO_(2)*** this work,the calcium-based sorbents were prepared from stainless steel slag leachate by co-precipitation,and the initial CO_(2)chemisorption capacity of the calcium-based sorbent prepared from steel slag with the Ca and Mg molar ratio of 3.64:1 was 0.40 g/***,the effect of Ca/Mg molar ratio on the morphology,structure,and CO_(2)chemisorption capacity of the calcium-based sorbents were *** results show that the optimal Ca/Mg molar ratio of sorbent for CO_(2)capture was4.2:1,and the skeleton support effect of MgO in calcium-based sorbents was ***,the chemisorption kinetics of the sorbents was studied using the Avrami-Erofeev *** were two processes of CO_(2)chemisorption,and the activation energy of the first stage(reaction control)was found to be lower than that of the second stage(diffusion control).

关键词： steel slag carbon dioxide capture sorbent chemisorption kinetics

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Announcing the 2026 ACS Photonics Young Investigator Lectureship Award Winner

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ACS Photonics 2025年第5期12卷 2260-2261页

作者： Quidant, Romain Department of Mechanical and Process Engineering Nanophotonic Systems Laboratory ETH Zurich Leonhardstrasse 21 LEE P 207 Zurich8092 Switzerland

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Distributionally Robust MPC for Nonlinear systems

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IFAC-PapersOnLine 2022年第7期55卷 606-613页

作者： Zhengang Zhong Ehecatl Antonio del Rio-Chanona Panagiotis Petsagkourakis Sargent Centre for Process Systems Engineering Imperial College London

Classical stochastic model predictive control (SMPC) methods assume that the true probability distribution of uncertainties in controlled systems is provided in advance. However, in real-world systems, only partial distribution information can be acquired for SMPC. The discrepancy between the true distribution and the distribution assumed can result in sub-optimality or even infeasibility of the system. To address this, we present a novel distributionally robust data-driven MPC scheme to control stochastic nonlinear systems. We use distributionally robust constraints to bound the violation of the expected state-constraints under process disturbance. Sequential linearization is performed at each sampling time to guarantee that the system's states comply with constraints with respect to the worst-case distribution within the Wasserstein ball centered at the discrete empirical probability distribution. Under this distributionally robust MPC scheme, control laws can be efficiently derived by solving a conic program. The competence of this scheme for disturbed nonlinear systems is demonstrated through two case studies.

关键词： Model predictive control

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Historical Attack-Intensity-Based Event-Triggered Platoon control of Connected Vehicles Under Actuator Failures and DoS Attacks

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 8052-8062页

作者： Lin, Huichao Dong, Jiuxiang Park, Ju H. 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 Yeungnam University Department of Electrical Engineering Kyongsan38541 Korea Republic of

This paper considers the event-triggered (ET) platoon control of connected vehicles in the presence of actuator failures and DoS attacks. First, a historical attack-intensity-based ET mechanism is proposed to optimize communication resources. Compared with the existing event trigger mechanism, this mechanism utilizes not only the state error information but also historical attack intensity data to dynamically adjust the trigger threshold, which further conserves communication resources and enhances design flexibility in the case of DoS attacks. Next, a security platoon control scheme is designed to resist actuator faults and DoS attacks, and a delay switched system model is introduced to describe the vehicle platoon tracking error system. Then, a novel Lyapunov functional is developed and combined with switching techniques to establish sufficient conditions for the exponential stability of the tracking error system. Additionally, a co-design method of controller gain and event trigger parameters is proposed. Finally, simulation examples validate the superiority of the proposed historical attack-intensity-based ET platooning control scheme. © 1967-2012 IEEE.

关键词： Lyapunov functions

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The effect of graph complexity in an energy-based FDI approach

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IFAC-PapersOnLine 2024年第4期58卷 622-627页

作者： Jan H. Smith George van Schoor Kenneth R. Uren Thomas Schäfer School of Electrical Electronic and Computer Engineering Faculty of Engineering North-West University South Africa Unit for Energy and Technology Systems Faculty of Engineering North-West University Institute for Process Technology Process Automation and Measurement Technology Zittau/Görlitz Germanuy

This paper introduces a structured approach for creating node signature graphs in energy graph-based visualization for industrial systems, focusing on anomaly detection. It examines the relationship between graph cardinality and the singular value decomposition analysis applied in the energy graph-based visualization method. The results reveal a trade-of between graph complexity and singular value resolution. The study highlights how graph structure affects energy flow monitoring and anomaly detection. It notably enables fault detection in components not represented as nodes, enhancing the methodology in energy-based system monitoring.

关键词： Fault detection isolation Graph reduction Graph matching Hybrid FDI Industrial process Thermal flow process Graph-based anomaly detection

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Magnetically enhancing diffusion for dendrite-free and long-term stable lithium metal anodes

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Green Energy & Environment 2022年第5期7卷 965-974页

作者： Yongxiu Chen Xiangyu Dou Kai Wang Yongsheng Han State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100190China School of Metallurgy and Materials University of BirminghamBirminghamBT152TTUK

Lithium metal batteries are promising devices for the next-generation energy storage due to their ultrahigh theoretical specific capacity and extremely low electrochemical *** inherent problem is the formation of lithium dendrites in cycling,which has induced safety concerns for almost half a *** understanding the formation mechanism of branching structures,we propose to suppress lithium dendrites by adopting external magnetic fields to induce diffusion enhancement at the interface of the anode,thus attenuating concentration gradient there and reducing the driving force for the formation of dendritic *** diffusion coefficient of lithium ions is dependent on the strength of magnetic fields,confirming the effectiveness of magnetic fields in improving Li^(+) *** employing the magnetic field of0.8 T,the concentration gradients at the growth front becomes nearly half of the control case,which leads to a dendrite-free lithium deposition up to the high current density of 10 mA cm^(-2).Both the Cu|LiCoO_(2) batteries and the symmetric Li | Li coin cells show a long-term stable cycling at high current densities under the assistance of magnetic *** diffusion enhanced technique promises a facile and general approach to suppress dendritic structures in secondary batteries,which may help to develop quick charging strategies.

关键词： lithium diffusion cycling

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