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5th International Conference on System Reliability and Safety engineering, SRSE 2023

作者： Mi, Yancheng Zuo, Yakun Lian, Chao Guo, Linhan Han, Fusong Avic Aviation Simulation System Co. Ltd Project Department Shanghai China Beihang University School of Reliability and Systems Engineering Beijing China

ISBN: (纸本)9798350305944

To ensure the availability, reliability, and safety of the flight simulator, which is a complex system, considering the different detection methods of periodic maintenance and non-periodic maintenance, and considering the impact of maintenance effects, a detection method of preventive maintenance of flight simulator is proposed. First, the detection interval model of preventive maintenance of the flight simulator is established according to the detection characteristics of periodic maintenance and non-periodic maintenance. Then the preventive maintenance time model of the flight simulator is established by considering the relationship between inspection time and maintenance. Based on the preventive maintenance inspection interval model and preventive maintenance time model, the optimization model of the preventive maintenance inspection interval of the flight simulator is established. Finally, a case of the visual subsystem of a flight simulator is constructed and the case results are analyzed to verify the effectiveness and applicability of the model and algorithm. © 2023 IEEE.

关键词： Preventive maintenance

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Transforming Cognitive Maps into Markov Process Models for Software Development Projects

Transforming Cognitive Maps into Markov Process Models for S...

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2023 IEEE International Conference on Smart Information systems and Technologies, SIST 2023

作者： Kolesnikova, Kateryna Myrzakerimova, Alua Alpysbay, Nursultan Olekh, Tetiana International It University Department of Information Systems Almaty Kazakhstan International It University Department of Computer Engineering Almaty Kazakhstan Odessa National Polytechnic University Department of Higher Mathematics and Systems Simulation Odessa Ukraine

ISBN: (纸本)9798350335040

The complexity of managing software development projects in organizational and technical systems is due to a number of features. Such projects are weakly structured systems. The parameters of weakly structured systems form a complex 'web' of connections and states that change over time. The development of projects in such a multifactorial environment can only be represented in the form of qualitative models. The use of cognitive maps with their subsequent presentation in the form of Markov chains allows quantifying the course of project processes, which are the main condition for the success of the project. At the same time, quantitative estimates represent not only a multi-vector picture of the state of projects, but also have the property of forecasting. The scope of the proposed method can be significantly expanded through the use in the educational process in the training of professionals in the field of programming and project management. © 2023 IEEE.

关键词： Directed graphs

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Significant potential of Solid Oxide Fuel Cell systems for distributed power generation and carbon neutrality

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Frontiers in Energy 2022年第6期16卷 879-882页

作者： Ziyuan TENG Minfang HAN Fuel Cell and Energy Storage Center Department of Energy and Power EngineeringState Key Laboratory of Control and Simulation of Power Systems and Generation EquipmentTsinghua UniversityBeijing 100084China

Energy is important for human survival and *** September 2020,the Chinese government announced that“China aims to have their CO_(2) emissions peak before 2030 and achieve carbon neutrality before 2060.”As China’s reformation and opening-up proceeds into its fifth decade,this new vision for its future is in line with that of the world’s major economies in terms of the need to reach net zero emissions globally by the mid-21stcentury[1].However,coal-fueled thermal power generation is currently dominant and accounts for more than 70%of the total amount of power generated in China,making it the world’s largest energy consumer and carbon *** on the country’s domestic resources,namely the abundance of coal and scarcity of oil and gas,it would be difficult to fundamentally change this coal-based energy structure in the short *** 2021,the global total energy sector was responsible for 36.3 Gt of CO_(2) emissions,including approximately 12 Gt from China,which thus accounts for one-third of the total global emissions[2].The demand for efficiency,energy savings,and emissions reduction in the power generation industry has become increasingly *** need has arisen to enhance ways in which to use coal cleanly and efficiently,reduce the consumption thereof,and replace coal with other forms of *** addition,carbon emissions need to be lowered by promoting the adoption of alternative power generation technologies that are more energy *** would require transformation away from coal power and the exploration of clean,efficient,flexible,and safe forms of energy as the main future development directions[3].

关键词： neutral carbon replace

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CANTILEVER FREE MAGNETIC ACTUATION FOR MULTISTABLE VERTICAL DISPLACEMENT

CANTILEVER FREE MAGNETIC ACTUATION FOR MULTISTABLE VERTICAL ...

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MikroSystemTechnik Kongress 2023: Mikroelektronik, Mikrosystemtechnik und ihre Anwendungen - Nachhaltigkeit und TechnologiesouveranitatMicrosystems Technology Congress 2023: Microelectronics, Microsystems Technology and their Applications - Sustainability and Technology Sovereignty

作者： Weber, Pascal M. Schütz, Arwed Bechtold, Tamara Wallrabe, Ulrike Laboratory for Microactuators IMTEK - Department of Microsystems Engineering University Freiburg Germany Research Group for Modelling and Simulation of Mechatronic Systems Jade University of Applied Sciences Germany

ISBN: (纸本)9783800762040

We present a cantilever-free magnetic actuator, that allows for multistable vertical positioning within a movement range of several mm. Compared to classical solenoid actuation, it features three predefined stable positions in which no energy is consumed. We optimised the shape of the magnetic field to define these stable positions. In a proof of concept, our actuator achieved a response time down to 3.6 ms for the total displacement of 3.3 mm. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Magnetic actuators

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Applying LSTM for River's Water Level Forecasting as Potential Flood Indication: A Case Study in Greece 15

Applying LSTM for River's Water Level Forecasting as Potenti...

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15th International Conference on Information, Intelligence, systems and Applications, IISA 2024

作者： Tziolas, Theodoros Papageorgiou, Elpiniki Papageorgiou, Konstantinos Zardas, Georgios Lekidis, Alexios Panagiotis, Papazoglou University of Thessaly Dept. of Energy Systems Gaiopolis Campus Larisa41500 Greece University of Thessaly Dept. of Electrical and Computer Engineering Volos Greece National and Kapodistrian University of Athens Dept. of Architecture and Computer and Communication Simulation Systems Chalkida Greece

ISBN: (纸本)9798350368833

Floods can have significant life-threatening and economic impacts on human societies. Flood forecasting with data-driven methods is a crucial aspect of disaster risk management, providing valuable insights into potential flood events and allowing for timely mitigation measures. This work illustrates the application of a Long Short-Term Memory (LSTM) neural network for short-term forecasting of a river's water level. The water treatment data used for training the LSTM models were gathered from Sperchios river, located in central Greece. Historical time-series data in a half-hour interval of the river's water level, water velocity, and area precipitation were utilized for the development of the proposed scheme. The developed model is deployed in the backend of a web application for half-hour ahead predictions of the river's water level that are visualized in the frontend. The post-analysis of the deployed forecasting model indicates that it consistently delivers forecasts with minimal error and demonstrates high accuracy in recent flood events. © 2024 IEEE.

关键词： Rivers

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OPTIMIZATION-BASED MOTION PRIMITIVE AUTOMATA FOR AUTONOMOUS DRIVING

arXiv

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arXiv 2024年

作者： Pedrosa, Matheus V.A. Scheffe, Patrick Alrifaee, Bassam Flabkamp, Kathrin Systems Modeling and Simulation Systems Engineering Saarland University Germany Embedded Software RWTH Aachen University Germany

Trajectory planning for autonomous cars can be addressed by primitive-based methods, which encode nonlinear dynamical system behavior into automata. In this paper, we focus on optimal trajectory planning. Since, typically, multiple criteria have to be taken into account, multiobjective optimization problems have to be solved. For the resulting Pareto-optimal motion primitives, we introduce a universal automaton, which can be reduced or reconfigured according to prioritized criteria during planning. We evaluate a corresponding multi-vehicle planning scenario with both simulations and laboratory experiments. © 2024, CC BY-NC-ND.

关键词： Nonlinear dynamical systems

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A Fuzzy Hierarchical Strategy for Improving Frequency Regulation of Battery Energy Storage System

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Journal of Modern Power systems and Clean Energy 2021年第4期9卷 689-698页

作者： Kaifeng Wang Ying Qiao Lirong Xie Jiaming Li Zongxiang Lu Huan Yang School of Electrical Engineering Xinjiang UniversityUrumqiChina State Key Laboratory of Control and Simulation of Power Systems Generation Equipments of Electrical Engineering Tsinghua UniversityBeijingChina

Battery energy storage systems(BESSs)can provide instantaneous support for frequency regulation(FR)because of their fast response ***,purely pursuing a better FR effect calls for continually rapid cycles of BESSs,which shortens their lifetime and deteriorates the operational *** coordinate the lifespan savings and the FR effect,this paper presents a control strategy for the FR of BESSs based on fuzzy logic and hierarchical *** fuzzy logic controller improves the effect of FR by adjusting the charging/discharging power of the BESS with a higher response speed and precision based on the area control error(ACE)signal and the change rate of ACE in a non-linear *** controllers effectively reduce the life loss by optimizing the depth of discharge,which ensures that the state of charge(SOC)of BESS is always in the optimal operating range,and the total FR cost is the lowest at this *** proposed method can achieve the optimal balance between ACE reduction and operational economy of *** effectiveness of the proposed strategy is verified in a two-area power system.

关键词： Battery energy storage system(BESS) frequency regulation(FR) coordinated control strategy optimal depth of discharge charging/discharging threshold

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Supertetragonal BaZrS_(3):A promising perovskite sulphide with giant ferroelectricity and low band gap

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 126-133页

作者： Menglu Li Sa Zhang Chenhan Liu Xiaotao Zu Liang Qiao Haiyan Xiao School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China College of Mathematics and Physics Chengdu University of TechnologyChengdu 610059China Micro-and Nano-scale Thermal Measurement and Thermal Management Laboratory Ministry of Education Key Laboratory of Numerical Simulation of Large-Scale Complex SystemsSchool of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210023China

Over the past century,ferroelectricity has offered exciting opportunities for fundamental research and device ***,most of the discovered excellent ferroelectrics are oxide materials with large band gaps,limiting their potential for optoelectronics *** using first-principles calculations we identify a new narrow-gap ferroelectric beyond oxides,i.e.,ferroelectric perovskite sulphide BaZrS_(3).Under large compressive strains,BaZrS_(3)can be stabilized into a unique supertetragonal phase with an extraordinary polarization of 67.16μC/cm^(2),which is even stronger than that of conventional oxide ***,the supertetragonal BaZrS_(3)exhibits a direct narrow band gap of 1.2 eV and excellent electronic *** on the chemical bonding analysis,we attribute the formation of supertetragonal phase to charge re-ordering in which theπbond overlap along the long〈Zr-S〉bond completely vanishes and the antibonding states of theσbond appear below the Fermi *** work provides a conceptual strategy for designing new ferroelectrics for electronic and photovoltaic applications.

关键词： supertetragonal phase perovskite sulphide ferroelectricity

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Simultaneously Identifying the System Dynamics and Fault Isolation for Air Data Sensor Failures: A Convex Approach

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IFAC-PapersOnLine 2024年第4期58卷 103-108页

作者： J. Noom C.C. de Visser N.S. Ramesh M. Verhaegen Delft University of Technology Department of Mechanical Engineering Delft Center for Systems and Control Delft University of Technology Department of Aerospace Engineering Control and Simulation Division

This paper addresses the key question that when faults occur either the aircraft system dynamics changes due to the fault or these dynamics are unknown (precisely). This question is addressed for the important case of Air Data Sensor failures, due to e.g. icing, for fixed wing aircraft operating in a nominal fight condition. The solution to this question uses basic ideas from subspace Identification to cast this problem in linear least squares problem with convex constraints (nuclear norm and 1-norm constraints). The latter are relaxations of a rank and cardinality constraint. The presented solution is validated using real-life fight test data.

关键词： Signal Identification-based methods Flight control fault detection FDI for linear systems

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Analytical solutions of turbulent boundary layer beneath forward-leaning waves

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 695-710页

作者： Yiqin XIE Jifu ZHOU Xu WANG Jinlong DUAN Yongjun LU Shouqian LI Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210024China

As a typical nonlinear wave,forward-leaning waves can be frequently encountered in the near-shore areas,which can impact coastal sediment transport ***,it is of significance to describe the characteristics of the boundary layer beneath forward-leaning waves accurately,especially for the turbulent boundary *** this work,the linearized turbulent boundary layer model with a linear turbulent viscosity coefficient is applied,and the novel expression of the near-bed orbital velocity that has been worked out by the authors for forward-leaning waves of arbitrary forward-leaning degrees is further used to specify the free stream boundary condition of the bottom boundary ***,a variable transformation is found so as to make the equation of the turbulent boundary layer model be solved analytically through a modified Bessel ***,an explicit analytical solution of the turbulent boundary layer beneath forward-leaning waves is derived by means of variable separation and variable *** analytical solutions of the velocity profile and bottom shear stress of the turbulent boundary layer beneath forward-leaning waves are verified by comparing the present analytical results with typical experimental data available in the previous literature.

关键词： forward-leaning wave turbulent boundary layer velocity profile bottom shear stress

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