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4th International Conference on Processing and Characterization of Materials, ICPCM 2022

作者： Hadi, Ahmed Kadauw, Abdulkader Zeidler, Henning Mechanical and Mechatronic Department College of Engineering Salahaddin University-Erbil Kurdistan Region Iraq Department of Machine Elements Engineering Design and Manufacturing TechnischeUniversität Bergakademie Freiberg Germany

The Fused Filament Fabrication (FFF) process of polymer-based composites has advanced due to its ability to create intricate forms and geometries while maintaining excellent mechanical qualities. Nylon 6 reinforced by 20% glass fiber filament (PA6GF) has more mechanical strength and wear resistance than standard nylon. However, FFF-based 3D printed composites can suffer from poor bead-to-bead bonding and high void content, reducing their mechanical strength. Therefore, this study aims to investigate how the temperature development and mechanical characteristics of FFF-made PA6 reinforced with chopped glass fibers change depending on crucial process parameters. The study used the D638 ASTM tensile test specimen to determine the ultimate strength of the materials. The researchers conducted experiments using different process parameters such as liquefier temperature, print speed, and bed temperature, while varying moisture content and heat treatment profiles. They compared the mechanical characteristics of neat PA6 and PA6GF and investigated the role of these factors in bonding formation during the FFF process and the following mechanical characteristics of the printed pieces. The results showed that the correct heat treatment profiles significantly improved the strength and modulus of 3D-printed composites. The lower the moisture, the higher the tensile strength, by 17% due to diminished voids in the sample. For a given moisture content, the higher the temperature, the better the tensile strength, by 3%. The fiber reinforcements of the samples gave comparatively higher tensile strength, by 45%, which was an intuitive outcome. This study demonstrates that controlling the process parameters of the FFF process, such as liquefier temperature, print speed, and bed temperature, can significantly affect the mechanical properties of 3D-printed objects. Furthermore, moisture content and heat treatment profiles also play a crucial role in bonding formation and, consequently, th

关键词： Tensile strength

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Self-Powered,Long-Durable,and Highly Selective Oil-Solid Triboelectric Nanogenerator for Energy Harvesting and Intelligent Monitoring

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Nano-Micro Letters 2022年第10期14卷 95-107页

作者： Jun Zhao Di Wang Fan Zhang Jinshan Pan Per Claesson Roland Larsson Yijun Shi Division of Machine Elements Department of Engineering Sciences and MathematicsLuleåUniversity of Technology97187 LuleåSweden Department of Engineering and Design School of Engineering and InformaticsUniversity of SussexBrighton BN19RHUK Division of Surface and Corrosion Science Department of ChemistryKTH Royal Institute of Technology10044 StockholmSweden

Triboelectric nanogenerators(TENGs)have potential to achieve energy harvesting and condition monitoring of oils,the“lifeblood”of ***,oil absorption on the solid surfaces is a great challenge for oil-solid TENG(O-TENG).Here,oleophobic/superamphiphobic O-TENGs are achieved via engineering of solid surface wetting *** designed O-TENG can generate an excellent electricity(with a charge density of 9.1μC m^(−2) and a power density of 1.23 mW m^(−2)),which is an order of magnitude higher than other O-TENGs made from polytetrafluoroethylene and *** also has a significant durability(30,000 cycles)and can power a digital thermometer for self-powered sensor ***,a superhigh-sensitivity O-TENG monitoring system is successfully developed for real-time detecting particle/water contaminants in *** O-TENG can detect particle contaminants at least down to 0.01 wt%and water contaminants down to 100 ppm,which are much better than previous online monitoring methods(particle>0.1 wt%;water>1000 ppm).More interesting,the developed O-TENG can also distinguish water from other contaminants,which means the developed O-TENG has a highly water-selective *** work provides an ideal strategy for enhancing the output and durability of TENGs for oil-solid contact and opens new intelligent pathways for oil-solid energy harvesting and oil condition monitoring.

关键词： Oil Triboelectric nanogenerator Energy harvesting Intelligent monitoring

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Detail and structural design of a fixed-wing BWB UAV 13

Detail and structural design of a fixed-wing BWB UAV

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13th EASN International Conference on Innovation in Aviation and Space for Opening New Horizons

作者： Psarros, A. Kapsalis, S. Dimopoulos, T. Mitridis, D. Terzis, D. Giannakis, E. Panagiotou, P. Savaidis, G. Yakinthos, K. Laboratory of Machine Elements & Machine Design Department of Mechanical Engineering Aristotle University of Thessaloniki Thessaloniki54124 Greece Laboratory of Fluid Mechanics & Turbomachinery Department of Mechanical Engineering Aristotle University of Thessaloniki Thessaloniki54124 Greece Aristotle University of Thessaloniki Thessaloniki57001 Greece Aristotle University of Thessaloniki Thessaloniki57001 Greece

The current study focuses on the development of a prototype BWB UAV for highway traffic monitoring by supporting a Cooperative Intelligent Transport System (C-ITS). This system allows the monitoring of traffic conditions at large roads and highways. Having determined the mission requirements and concluded the aerodynamic conceptual and preliminary design phases, high fidelity CFD simulations are performed, aiming to calculate the key aerodynamic and stability characteristics of the platform and to optimize its performance throughout the mission. More specifically, regarding the aerodynamic vehicle design, results concerning the calculation of stability derivatives, control surfaces sizing, trim analysis and flight envelope (V-n diagram) are presented, along with the respective methodologies. Considering the structural design of the aircraft, a combination of layout, FE simulations and parameterized design tools were employed, allowing the design and sizing of the skin and the internal structural parts. The parts are mainly made of composite and additively manufactured nylon materials. Coupled interaction loops are conducted among the aerodynamic and structural analyses to optimize the overall performance of the aerial vehicle, maximizing the aerodynamic efficiency, and reducing the structural weight. Finally, the study is concluded by the presentation of the manufactured prototype of the UAV, which satisfies all the structural, aerodynamic, stability and performance requirements for the established highway traffic monitoring mission. © Published under licence by IOP Publishing Ltd.

关键词： Intelligent systems

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Additive Manufacturing of Ceramics opens the door to Components for Biomanufacturing Applications with high Functionality 6

Additive Manufacturing of Ceramics opens the door to Compone...

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6th CIRP Conference on BioManufacturing, BioM 2024

作者： Scheithauer, Uwe Holtzhausen, Stefan Wiemer, Hajo Fraunhofer Institute for Ceramic Technologies and Systems Group Additive and Hybrid Manufacturing Winterbergstr. 28 Dresden01277 Germany TUD Dresden University of Technology Institute of Machine Elements and Machine Design Virtual Product Development Group Advanced Geometric Modeling And Analysis Dresden01062 Germany TUD Dresden University of Technology Institute of Mechatronic Engineering Machine Tools Development and Adaptive Controls Department of Machine Data Processing Dresden01062 Germany

Significant advancements in production technology, materials, component design, and data science foster innovation across industries, including biomanufacturing. Ceramic materials, adapted additive manufacturing processes, and novel construction methods hold immense innovation potential due to ceramics' exceptional thermal, chemical, and mechanical properties. Additive manufacturing enables the creation of intricate ceramic components with unprecedented functionality. Hybridizing manufacturing technologies and materials facilitates direct integration of additional features like sensors and actuators. Despite their potential, ceramic materials remain underutilized. This article aims to spark a discourse on leveraging high-performance ceramic components in biomanufacturing, leveraging superior material properties, innovative design methods, additive manufacturing, process data analysis, and AI. © 2024 The Authors.

关键词： Ceramic materials

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The effect of printing temperature and moisture on tensile properties of 3D printed glass fiber reinforced nylon 6

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Materials Today: Proceedings 2023年 91卷 48-55页

作者： Ahmed Hadi Abdulkader Kadauw Henning Zeidler Mechanical and Mechatronic Department College of Engineering Salahaddin University-Erbil Kurdistan Region Iraq Department of Machine Elements Engineering Design and Manufacturing TechnischeUniversität Bergakademie Freiberg Germany

关键词： Fused Filament Fabrication Glass fiber filament Q-DAS software 3D printed composites filament Tensile Strength

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Composite armor philosophy(CAP):Holistic design methodology of multi-layered composite protection systems for armored vehicles

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Defence Technology（防务技术） 2024年第11期41卷 181-197页

作者： Evangelos Ch.Tsirogiannis Foivos Psarommatis Alexandros Prospathopoulos Georgios Savaidis EODH SA Research and Development Department63080LakkomaChalkidikisGreece SIRIUS Department of InformaticsUniversity of OsloGaustadalleen 23B0373OsloNorway Physical Metallurgy Laboratory(PML) Mechanical Engineering DepartmentAristotle University of Thessaloniki54124ThessalonikiGreece Centre for Research&Development of Advanced Materials(CERDAM) Center for Interdisciplinary Research and InnovationBalkan CenterBuilding B’10th km Thessaloniki-Thermi Road57001ThessalonikiGreece Laboratory of Machine Elements&Machine Design School of Mechanical EngineeringAristotle University of Thessaloniki54124ThessalonikiGreece Digital Representation and Additive Manufacturing(DRAM) Center for Interdisciplinary Research and InnovationBalkan CenterBuilding B’10th kmThessaloniki-Thermi Road57001ThessalonikiGreece

A philosophy for the design of novel,lightweight,multi-layered armor,referred to as Composite Armor Philosophy(CAP),which can adapt to the passive protection of light-,medium-,and heavy-armored vehicles,is presented in this *** can serve as a guiding principle to assist designers in comprehending the distinct roles fulfilled by each *** CAP proposal comprises four functional layers,organized in a suggested hierarchy of *** notable is the inclusion of a ceramic-composite principle,representing an advanced and innovative solution in the field of armor *** paper showcases real-world defense industry applications,offering case studies that demonstrate the effectiveness of this advanced *** represents a significant milestone in the history of passive protection,marking an evolutionary leap in the *** philosophical approach provides designers with a powerful toolset with which to enhance the protection capabilities of military vehicles,making them more resilient and better equipped to meet the challenges of modern warfare.

关键词： Passive armor protection Composite armor Ballistic performance Protection systems Vehicle protection Armor design

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The Effect of External Forces on the Load Sharing of a Full Planet Engagement Planetary Gear Train 3

The Effect of External Forces on the Load Sharing of a Full ...

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3rd International Conference on Communications, Information, Electronic and Energy Systems, CIEES 2022

作者： Ivanov, Vladislav Aleksandrov, Angel Tsonev, Veselin Kuzmanov, Nikola Troha, Sanjin Dimitrov, Lubomir Technical University of Sofia Dept. of Machine Elements And Nonmetallic Constructions Sofia Bulgaria Technical University of Sofia Dept.of Mechanics Sofia Bulgaria Technical University of Sofia Department of Mechanics Sofia Bulgaria University of Rijeka Department of Mechanical Engineering Design Rijeka Croatia Technical University of Sofia Department of Machine Elements And Non-metallic Constructions Sofia Bulgaria

ISBN: (数字)9781665491495

ISBN: (纸本)9781665491495

The aim of the study is to experimentally investigate the effects of external forces on the load sharing characteristics of the full planet engagement gear train. This type of planetary gear trains has a high power density but due to the complexity of the planets' arrangement and the resulting specific assembly and adjacent conditions they are not widely used and there is very little known about the load distribution between the planets, especially in case of additional external loads applied to the gear train. To explore that influence a special test rig using a closed loop power flow is designed and manufactured allowing for the application of external load parallel to the torque applied. Low speed dynamic testing is conducted with different load scenarios and positions of the carrier. All data is acquired with strain gauges and the resulting bending stresses in the pins of the planets are calculated. The load sharing factor LSF is calculated for the planets and the results are presented graphically. © 2022 IEEE.

关键词： Electric load flow

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ON METHODOLOGY FOR A DIGITAL TWIN OF SHIP PROPULSION UNDER HARSH ENVIRONMENTAL CONDITIONS 43

ON METHODOLOGY FOR A DIGITAL TWIN OF SHIP PROPULSION UNDER H...

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ASME 2024 43rd International Conference on Ocean, Offshore and Arctic engineering, OMAE 2024

作者： Purcell, Etienne Nejad, Amir R. Böhm, Angelo Sapp, Lina Lund, Jorrid von Bock und Polach, Franz Nickerson, Brendon M. Bekker, Anriëtte Gilges, Markus Saleh, Ahmed Lehmann, Benjamin Jacobs, Georg Valavi, Mostafa Kranz, Tobias Department of Marine Technology Norwegian University of Science & Technology TrondheimNO-7491 Norway Institute for Ship Structural Design and Analysis Hamburg University of Technology Hamburg21073 Germany Department of Mechanical & Mechatronic Engineering Stellenbosch University Stellenbosch7600 South Africa Institute for Machine Elements and Systems Engineering RWTH Aachen University Aachen52062 Germany EDR & MEDESO AS Lysaker1327 Norway Otto Piening GmbH Am Altendeich 83 Glückstadt25348 Germany

ISBN: (纸本)9780791887844

The propulsion system of a ship is a critical element for its safety and integrity. Therefore, it must be maintained properly to ensure that a vessel is able to fulfill its primary purpose. The need for maintenance is even more pronounced in ships where extreme environmental conditions, such as ice-covered waters, are expected. This is due to an increase in the magnitude and uncertainty of loads and therewith the increase in possible damages if the propulsion system fails. The use of digital twins is becoming increasingly popular in shipping and can also be used for intelligent maintenance and operation prediction of the propulsion system. This paper proposes the methodology of creating such a digital twin with a specific focus on the required measurement infrastructure, modeling of components, loads, and damage as well as how all of these aspects are combined. The digital twin was created using a polar supply and research vessel, S.A. Agulhas II. Bearings are discussed from the view of high-fidelity simulations and wear modeling. The propeller is modeled as a point mass with the propeller laws for predicting the hydrodynamic torque and thrust. Shaft dynamics are modeled using either a lumped-mass torsional model, a modal model, or a finite element model. Damage of the shaft and the propeller is based on SN-curve fatigue calculations. The motor torque is modeled using an equivalent circuit model while motor damage is modeled by estimating the hottest temperature within the motor windings. Ice-breaking simulations are used as inputs to propeller-ice interaction models to obtain insight into the loads caused by these interactions. The material properties of ice used during simulations are validated using experiments. The need for further validation for low-fidelity models and the need for reduced order modeling or surrogate models for high-fidelity models are discussed. Finally, the implementation of this digital twin is discussed based on the developed model and the

关键词： Ship propulsion

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Determination of the Characteristics of Gears of Robot-Like Systems by Analytical Description of their Structure

Determination of the Characteristics of Gears of Robot-Like ...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Stefan Landler Raúl Molina Blanco Michael Otto Birgit Vogel-Heuser Markus Zimmermann Karsten Stahl Technical University of Munich Germany TUM School of Engineering and Design Department of Mechanical Engineering Munich Institute of Robotics and Machine Intelligence (MIRMI) Institute of Machine Elements Gear Research Center (FZG) Institute of Automation and Information Systems (AIS) Laboratory for Product Development and Lightweight Design (LPL)

The axes of robots and robot-like systems (RLS) usually include e-motor-gearbox-arrangements for optimal connection of the elements. The characteristics of the drive system and thus also of the robot depend strongly on the gears. Different gearbox designs are available which differ in stiffness, efficiency and further properties. For an application-optimal design of RLS a uniform documentation and a comparability of gearbox concepts is a decisive factor. The application-optimal design is supported by an interdisciplinary approach between mechanical engineering and software design, guided by adequate product development methodology. The quite heterogeneous characterization of gearboxes for RLS which is currently the state of the art is a relevant obstacle in the flexible and optimal design of RLS. The paper shows the analysis of the gear structure with unified symbols for specific machine elements and contact types. The introduced method gives insight into the mechanical structure of the gearboxes. Similarities between gear types can thus be revealed. This also enables the classification of new developments in the state of the art. Moreover, the developed method for analyzing the gear structure can be used to determine the characteristics of gears. Examples for these characteristics are backlash, efficiency or stiffness. Specifically, the stiffness of gears can be synthesized by the force action of individual contacts and the individual phenomena that occur with them. The representation by individual phenomena also makes it possible to extend the calculation to include influencing parameters such as temperature that have not been sufficiently taken into account so far.

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Additive Manufacturing of Ceramics opens the door to Components for Biomanufacturing Applications with high Functionality

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Procedia CIRP 2024年 125卷 284-289页

作者： Uwe Scheithauer Stefan Holtzhausen Hajo Wiemer Fraunhofer Institute for Ceramic Technologies and Systems Group Additive and Hybrid Manufacturing Winterbergstr. 28 01277 Dresden Germany TUD Dresden University of Technology Institute of Machine Elements and Machine Design Chair of Virtual Product Development Group Advanced Geometric Modeling And Analysis 01062 Dresden Germany TUD Dresden University of Technology Institute of Mechatronic Engineering Chair of Machine Tools Development and Adaptive Controls Department of Machine Data Processing 01062 Dresden Germany

Significant advancements in production technology, materials, component design, and data science foster innovation across industries, including biomanufacturing. Ceramic materials, adapted additive manufacturing processes, and novel construction methods hold immense innovation potential due to ceramics’ exceptional thermal, chemical, and mechanical properties. Additive manufacturing enables the creation of intricate ceramic components with unprecedented functionality. Hybridizing manufacturing technologies and materials facilitates direct integration of additional features like sensors and actuators. Despite their potential, ceramic materials remain underutilized. This article aims to spark a discourse on leveraging high-performance ceramic components in biomanufacturing, leveraging superior material properties, innovative design methods, additive manufacturing, process data analysis, and AI.

关键词： ceramics: additive manufacturing component design data science biomanufacturing

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