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1st International Conference on Structural Damage Modelling and Assessment, SDMA 2020

作者： Malekimoghadam, Reza Krause, Stefan Czichon, Steffen Department of Mechanical and Aerospace Engineering Politecnico Di Torino Corso Duca degli Abruzzi 24 Torino10129 Italy Fraunhofer Institute for Wind Energy Systems IWES Bremerhaven Germany

ISBN: (纸本)9789811591204

With increasing turbine size, monitoring of blades becomes increasingly important, in order to prevent catastrophic damages and unnecessary maintenance, minimize the downtime and labor cost and improving the safety issues and reliability. The present work provides a review and classification of various structural health monitoring (SHM) methods as strain measurement utilizing optical fiber sensors and Fiber Bragg Gratings (FBG’s), active/passive acoustic emission method, vibration‒based method, thermal imaging method and ultrasonic methods, based on the recent investigations and promising novel techniques. Since accuracy, comprehensiveness and cost-effectiveness are the fundamental parameters in selecting the SHM method, a systematically summarized investigation encompassing methods capabilities/limitations and sensors types, is needed. Furthermore, the damages which are included in the present work are fiber breakage, matrix cracking, delamination, fiber debonding, crack opening at leading/trailing edge and ice accretion. Taking into account the types of the sensors relevant to different SHM methods, the advantages/capabilities and disadvantages/limitations of represented methods are nominated and analyzed. © Springer Nature Singapore Pte Ltd. 2021.

关键词： Structural health monitoring

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Interfacial synthesis of crystalline quasi-two-dimensional polyaniline thin films for high-performance flexible on-chip micro-supercapacitors

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Chinese Chemical Letters 2022年第8期33卷 3921-3924页

作者： Tao Zhang Panpan Zhang Zhongquan Liao Faxing Wang Jinhui Wang Mingchao Wang Ehrenfried Zschech Xiaodong Zhuang Oliver G.Schmidt Xinliang Feng Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo 315201China Faculty of Chemistry and Food Chemistry Technische Universität DresdenDresden 01062Germany Center for Advancing Electronics Dresden(cfaed) Technische Universität DresdenDresden 01062Germany Fraunhofer Institute for Ceramic Technologies and Systems(IKTS) Dresden 01109Germany Material Systems for Nanoelectronics Chemnitz University of TechnologyChemnitz 09107Germany Institute for Integrative Nanosciences IFW DresdenDresden 01069Germany School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Special Functional Materials of Ministry of Education Henan UniversityKaifeng 475004China

Quasi-two-dimensional(q2 D)conducting polymer thin film synergizes the advantageous features of longrange molecular ordering and high intrinsic conductivity,which are promising for flexible thin film-based micro-supercapacitors(MSCs).Herein,we present the high-performance flexible MSCs based on highly ordered quasi-two-dimensional polyaniline(q2 D-PANI)thin film using surfactant monolayer assisted interfacial synthesis(SMAIS).Owing to high electrical conductivity,rich redox chemistry,and thin-film morphology,the q2 D-PANI MSCs show high volumetric specific capacitance(ca.360 F/cm^(3))and energy density(17.9 m Wh/cm^(3)),which outperform the state-of-art PANI thin-film based MSCs and promise for future flexible electronics.

关键词： 2D polymers Conducting polymers Interfacial synthesis Flexible electronics Microsupercapacitor

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An Experiment on 5G Open-RAN Platform with Sub-THz Backhauling

An Experiment on 5G Open-RAN Platform with Sub-THz Backhauli...

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IEEE Conference on Wireless Communications and Networking

作者： Norshahida Saba Efstathios Andrianopoulos Nikolaos K. Lyras Saimanoj Katta Mohammedadem Abdulkadir Evangelos Pikasis Garrit Schwanke Tianwen Qian Milan Deumer Simon Nellen Elias Tsirbas Eleftherios Loghis Georgios Megas Christos Tsokos Panos Groumas David De Felipe Robert B. Kohlhaas Maria Massaouti Christos Kouloumentas Dimitrios Kritharidis Norbert Keil Hercules Avramopoulos Jose Costa-Requena Riku Jäntti Department of Information and Communications Engineering Aalto University Espoo Finland Institute of Communication and Computer Systems Athens Greece School of Electrical and Computer Engineering National Technical University of Athens Athens Greece Cumucore Espoo Finland Intracom Telecom Peania Athens Greece Fraunhofer Heinrich Hertz Institute Berlin Germany Optagon Photonics Agia Paraskevi Athens Greece

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

The deployment of fifth-generation (5G) open radio access network (RAN) introduces new opportunities for wireless communication, particularly in the context of x-Haul wireless links. This paper presents a comprehensive demonstration of how photonic-generated sub- THz at 120 GHz was utilized for wireless backhaul within the 5G open RAN platform. The experimental setup highlighted the feasibility and effectiveness of establishing a sub- THz link as the backhaul, marking a significant advancement in this emerging field. Through extensive performance analysis, we evaluated 5G network's throughput, achieving approximately 957 Mbps for downlink with UDP and 269 Mbps with TCP. In the case of uplink, both UDP and TCP exhibited comparable speeds, both exceeding 80 Mbps. This work marks a significant achievement in advancing the development of photonic-generated sub- THz wireless links, holding the potential to enhance wireless transport capabilities, particularly in the context of advanced 5G networks and beyond..

关键词： Wireless communication 5G mobile communication Optical mixing Throughput Real-time systems Performance analysis Uplink

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Sustainable production and the role of digital twins–Basic reflections and perspectives

Journal of Advanced Manufacturing and Processing

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Journal of Advanced Manufacturing and Processing 2021年第2期3卷

作者： Miehe, Robert Waltersmann, Lara Sauer, Alexander Bauernhansl, Thomas Group for Sustainable Production Systems Fraunhofer Institute for Manufacturing Engineering and Automation IPA Stuttgart Germany

Sustainable production is essential for the future of the global economy. Despite the publication of its baseline vision over 30 years ago and the resulting diversity of interpretations and subdisciplines in engineering and social sciences, the progress of the approach in industrial practice remains marginal. This is mainly due to the fact that the discipline has not yet succeeded to realize the magnitude of the rethinking necessary of its very own perception as a whole. Existing definitions of sustainable production presented to date are thus only partly consistently derived from the baseline concept. Meanwhile, digitalization provides an increasing number of technologies that offer a new perspective on sustainable production. This especially applies to the concept of digital twins. Recent studies, thus, address their role in the context of sustainable production by analyzing its contribution to existing sustainability related methods as well as technical challenges on a microeconomic level (bottom-up approach). Although these approaches provide concrete requirements for technical deployment, it is highly questionable how they will contribute to sustainable production as a whole. In this paper, we choose a top-down approach to discuss the role of digital twins in the context of sustainable production. Based on fundamental reflections on the baseline concept of sustainability, we advocate a reorientation of production within the framework of planetary boundaries. Thereupon, we discuss the role of digital twins and digital threads and provide a number of requirements that future R&D needs to address for a future sustainability-oriented data-driven monitoring and regulation of production. © 2021 The Authors. Journal of Advanced Manufacturing and Processing published by Wiley Periodicals LLC on behalf of American institute of Chemical Engineers.

关键词： Sustainable development

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A Safe Control Architecture Based on Robust Model Predictive Control for Autonomous Driving

arXiv

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arXiv 2022年

作者： Nezami, Maryam Nguyen, Ngoc Thinh Männel, Georg Abbas, Hossam Seddik Schildbach, Georg Institute for Electrical Engineering in Medicine University of Lübeck Lübeck Germany Institute for Robotics and Cognitive Systems University of Lübeck Lübeck Germany Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering Fraunhofer IMTE Lübeck Germany

This paper proposes a Robust Safe Control Architecture (RSCA) for safe-decision making. The system to be controlled is a vehicle in the presence of bounded disturbances. The RSCA consists of two parts: a Supervisor MPC and a Controller MPC. Both the Supervisor and the Controller are tube MPCs (TMPCs). The Supervisor MPC provides a safety certificate for an operating controller and a backup control input in every step. After an unsafe action by the operating controller is predicted, the Controller MPC takes over the system. In this paper, a method for the computation of a terminal set is proposed, which is robust against changes in the road curvature and forces the vehicle to reach a safe reference. Moreover, two important proofs are provided in this paper. First, it is shown that the backup control input is safe to be applied to the system to lead the vehicle to a safe state. Next, the recursive feasibility of the RSCA is proven. By simulating some obstacle avoidance scenarios, the effectiveness of the proposed RSCA is confirmed. Copyright © 2022, The Authors. All rights reserved.

关键词： Controllers

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Photonic Mixers as Tx and Rx in a Bidirectional mmWave Real-Time Link

Photonic Mixers as Tx and Rx in a Bidirectional mmWave Real-...

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European Conference on Microwave

作者： Simon Nellen Milan Deumer Garritt Schwanke Efstathios Andrianopoulos Nikolaos K. Lyras Georgios Megas Evangelos Pikasis Dimitrios Kritharidis E. D. Tsirbas E. C. Loghis Tianwen Qian David de Felipe Maria Massaouti Christos Kouloumentas Panos Groumas Hercules Avramopoulos Martin Schell Norbert Keil Robert B. Kohlhaas Fraunhofer Institute for Telecommunications Heinrich Hertz Institute Germany School of Electrical and Computer Engineering National Technical University of Athens Greece Institute of Communication and Computer Systems Greece Intracom Telecom Greece Optagon Photonics Greece Institut für Festkörperphysik Technische Universität Berlin Germany

ISBN: (数字)9782874870774

ISBN: (纸本)9798350385892

Photonic components offer unique advantages for future broadband wireless communication links, especially for carrier frequencies above 100 GHz. We report on the latest developments regarding photonic mixers as transmitters and receivers for use in such wireless links. As an illustration, we present a real-time link at 110 GHz across 30 m free space exploiting both photonic technology from optical C-band and modems from state-of-the-art E-band technology.

关键词： Wireless communication Phase shift keying Bandwidth Modems Real-time systems Broadband communication Optical transmitters Millimeter wave communication Mixers Photonics

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Three-Dimensional Model of a cylindrical Lithium-Ion Cell – Influence of Cell Design on State Imbalances and Fast-Charging Capability

Three-Dimensional Model of a cylindrical Lithium-Ion Cell –...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Alexander Fill Mike Kopp Jessica Hemmerling Sabri Baazouzi Luca Tendera Kai Peter Birke Chair for Electrical Energy Storage Systems University of Stuttgart Stuttgart Germany Fraunhofer Institute for Manufacturing Engineering and Automation IPA Stuttgart Germany Mercedes-Benz Group AG Research and Development Stuttgart Germany

To find the best trade-off among fast-charging capability, lifespan and energy density, three-dimensional electrical and thermal models of lithium-ion cells are essential tools. The cell design, like the porosity and thickness of the electrodes, tab number, alignment and design as well as the cell geometry and format are important parameters to achieve said optimum. In this article a three-dimensional electrical and thermal model based on a half-cell Equivalent Circuit Model (ECM) of a cylindrical lithium-ion cell is presented. The model parametrization is based on a high-energy 18650 cell (NMC-811/SiC). For validation, measurements of a lithium-ion cell with an integrated temperature sensor are conducted. This allows to measure the core and surface temperature of the cell. The model shows a sufficient agreement to experimental data. Based on the model the influence of tab design and the cell format on state imbalances within the cell and the fast-charging capability are investigated. Increasing the number of tabs especially using the so called tabless design lead to a reduction of state imbalances and charging time while not increasing the potential of Li-plating or thermal hot-spots. These positive effects of tab design became more significant with increasing cell format.

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Fast-charging capability versus energy density – a parametric study using a multi-dimensional lithium-ion cell model

Fast-charging capability versus energy density – a parametr...

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Electrical, Computer, Communications and Mechatronics engineering (ICECCME), International Conference on

As a result of the steadily increasing market share of battery-electric vehicles, the demands on the battery system in terms of range and fast-charging capability are becoming tougher in order to meet customer needs. Depending on the design of the cell and the electrodes in particular, the lithium-ion cell can be optimized in terms of its energy and power density, but the two parameters are generally in conflict. This paper therefore addresses the influence of electrode thickness, porosity, and porosity-layered electrodes on fast-charging capability and energy density. For this purpose, a three-dimensional electrical and thermal model is implemented, which is parameterized and validated based on a high-energy cylindrical cell (NMC 811—Graphite-Si). To simulate the electrical behavior, a half-cell Equivalent Circuit Model is used. Starting from the reference cell, different electrode structures are investigated in terms of their fast-charging capability and energy density with the objective of finding an optimal combination of energy and power density.

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Local Microscopic and Integral Macroscopic Analysis of Magnetic Pulse Welds and Deformations for Dissimilar Metal Joints 13th

Local Microscopic and Integral Macroscopic Analysis of Magne...

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13th International Conference on the Technology of Plasticity, ICTP 2021

作者： Huberth, Frank Ragupathi, Balaji Scheffler, Christian Psyk, Verena Preußner, Johannes Fraunhofer Institute for Mechanics of Materials IWM Woehlerstrasse 11 Freiburg79108 Germany Department of Sustainable Systems Engineering EFM University of Freiburg Faculty of Engineering Emmy-Noether-Str. 2 Solar Info Center 4 Freiburg79110 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz09126 Germany

ISBN: (纸本)9783030753801

Magnetic pulse technology is used for high-speed forming as well as for joining. Joining by magnetic pulse welding (MPW) is the combination of high-speed forming, impact, and a resulting weld in the collision zone of the accelerated flyer and the impacted target. This MPW process allows the welding of dissimilar metals, like aluminum and steel for lightweight construction or aluminum and copper for E-mobility applications. Investigations showed up scattering in binding strength and failure for comparable welds. The effects leading to the bond formation and the reasons for the quality variation are not fully understood until now. For further understanding, a combined experimental investigation of integral and local mechanical weld properties supported by simulations and microstructure analysis was performed considering dissimilar metal joints of aluminum EN AW1050 H14/24 and copper Cu DHP R240 for different configurations and impact energies. Lap shear tests served for quantifying integral mechanical properties, while local mechanical properties were determined by microtensile tests on samples prepared in the thickness direction of the welded metal sheets and microstructural analysis. These local microscopic testing and analysis results provide information about the weld strength distribution. These investigations give new hints on the bond-forming mechanisms and local process depending on material effects. © 2021, The Minerals, Metals & Materials Society.

关键词： Welds

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SiC CMOS Gate Driver for High-Temperature Aerospace Applications

SiC CMOS Gate Driver for High-Temperature Aerospace Applicat...

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Argentine Conference on Electronics (CAE)

作者： Felipe Torres Andrés Martínez Jorge Marín Christian A. Rojas Joel Gak Mathias Rommel Alan H. Wilson-Veas Alexander May Michael Schraml Nicolás Calarco Matías Miguez Department of Electronic Eng. Universidad Técnica Federico Santa María Valparaiso Chile Advanced Center of Electrical and Electronics Engineering Universidad Técnica Federico Santa María Engineering Department Universidad Católica del Uruguay Montevideo Uruguay Fraunhofer Institute for Integrated Systems and Device Technology IISB Erlangen Germany

In this study, the exploration of fraunhofer IISB's 2 µrn 4H-silicon carbide (SiC) complementary metal-oxide-semiconductor (CMOS) technology is presented, with a focus on its application in a gate driver for operating power transistors in power converters. The paper concentrates on the thermal characteristics of the gate driver under various temperatures, a vital aspect for satellite power systems. Simulation results detail the gate driver's turn-on and turn-off timings, along with propagation delays at different temperatures. Specifically, at $295^fraunhofer$ C and 1 pF capacitive load, the maximum turn-on and turn-off times were found to be 29 ns and 15 ns respectively, while the maximum propagation delays for turn-on and turn-off were 89 ns and 145 ns. These findings are essential for assessing the gate driver's effectiveness and reliability in space environments. This research underline the efficacy of SiC technology for space applications, offering superior thermal management and radiation resistance.

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