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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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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

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

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Interdisciplinarity is a key to enhance the product development process - How students deal with it and how they evolve with it

Interdisciplinarity is a key to enhance the product developm...

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15th International Conference on engineering and Product design Education: design Education - Growing Our Future, EPDE 2013

作者： Gerber, Paul Krebber, Sönke Langer, Ingmar Röbig, Sinja Sprenger, Susanne Stocker, André Work and Engineering Psychology Research Group TU Darmstadt Germany Institute for Product Development and Machine Elements TU Darmstadt Germany Institute of Ergonomics TU Darmstadt Germany Department of Computer Integrated Design TU Darmstadt Germany Faculty of Design University of Applied Sciences Darmstadt Germany

ISBN: (纸本)9781904670421

Interdisciplinary work is gaining attention not only in the academic landscape. Even at University where many different disciplines coexist in a minimum amount of space, the interdisciplinary work was used too seldom in the past. In order to teach the graduates the required competences regarding teamwork and project work, but also to fulfil interdisciplinarity needs, the collaborative Advanced design Project (cADP) was integrated into the curriculum at Technische Universität Darmstadt. The cADP is based on a mandatory group work for mechanical engineering students, where engineering problems must be solved together according to the principle of minimal help. The focus of this mandatory project is not only on the problem solving process, but also in training and reflection of group processes. This project has been extended in such a way, that interdisciplinary teams of students of mechanical engineering with a focus on product development, ergonomics and computer aided techniques work on a product development project task together with students of psychology and industrial design. This new form of interdisciplinary team work of students was called cADP. The cADP focuses on the early stages of the computer aided development of ergonomic- And design-oriented products from the very first idea to building a virtual prototype up to a design and functional prototype and evaluating this one. Products should be designed using discipline typical methods, but with the use of synergy effects of the interdisciplinary team. In the following the experiences of students in the cADP project will be described;what are the main challenges of working together with other disciplines and how can there found a way to deal with it. For this purpose student questionnaires were analyzed. Furthermore it will be shown how the quality of the products increases through interdisciplinary cooperation. For this purpose classic group work results are compared with the results of cADP groups.

关键词： Students

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Closure to "Discussion of ‘Calculation of the Dynamic Coefficients of a Journal Bearing, Using a Variational Approach’" (1986, ASME J. Tribol., 108, p. 424)

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Journal of Tribology 1986年第3期108卷 425-425页

作者： Klit, P. Lund, J.W. Department of Machine Design The Engineering Academy of Denmark Lyngby2800 Denmark Department of Machine Elements The Technical University of Denmark Lyngby2800 Denmark

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Continuous integrity monitoring of large transportation products using Acoustic Emission

Continuous integrity monitoring of large transportation prod...

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3rd International Conference of engineering Against Failure, ICEAF 2013

作者： Tscheliesnig, Peter Savaidis, Georgios Baran, Ireneusz Jagenbrein, Andreas TÜV AUSTRIA SERVICES GMBH Department for Technical Physics Deutschstr. 10 1230 Vienna Austria Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design 54124 Thessaloniki Greece Cracow University of Technology Faculty of Mechanical Engineering Laboratory of Applied Research al. Jana Pawla II 37 31-864 Cracow Poland

ISBN: (纸本)9789608810433

An advanced methodology for integrity monitoring of structures based on Acoustic Emission and follow-up non-destructive testing has been developed and verified in laboratory1, 2. Current research activities3 focus on application to large-scaled transportation products (ships, road tankers, railway cars). Monitoring during operation enables early detection of degradations (corrosion, fatigue cracks) and condition-based maintenance. Consequently, transportation of (hazardous) goods will become safer and economically compared to conventional time-based inspections. Main features of the developed monitoring technique are: (a) identification of degradation using FEA based on load data, (b) use of advanced and intrinsically safe AE equipment, redesigned for application at transport products, identification of degradation mechanisms and separation of background noises, (c) on-line acquisition, assessment and storage of AE signals, and (d) follow-up non-destructive testing for verification of degradations. The developed monitoring technique and its validation on test objects are presented. AE signals are assessed to identify and locate degradation mechanisms. The results reveal capability and accuracy of the proposed methodology in the large-scale application field.

关键词： Structural health monitoring

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Evaluating customer requirements in Eco-VA 13

Evaluating customer requirements in Eco-VA

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13th CIRP International Conference on Life Cycle engineering, LCE 2006

作者： Sakao, Tomohiko Oberender, Christof Krone, Nils Shimomura, Yoshiki Birkhofer, Herbert Reichl, Herbert Darmstadt University of Technology Institute for Product Development and Machine Elements Germany Fraunhofer Institute for Reliability and Microintegration IZM Dept of Environmental Engineering Germany Tokyo Metropolitan University Department of System Design Japan Technical University Berlin Research Center Microperipheric Technologies Germany

ISBN: (纸本)905682712X

Products must be environmentally friendly as well as conform with the market in order to go for a sustainable society. A tool named Eco-Value Analysis (Eco-VA) has been developed by modifying the traditional Value Analysis (VA). Eco-VA allows product developers to analyze functions of a product from economic costs, customers’ importance, and environmental impacts. However, Eco-VA has the following possible improvements due to the characteristics of VA. First, it is difficult to obtain correct and accurate requirements of end users. There is a way for end users to do it in more "user-oriented" way. Second, Eco-VA does not support product developers with finding the product concept to be investigated. In order to improve in this weakness, this paper presents a new method called "Extended Eco-VA". First, the modeling method of Service engineering (SE) is adopted. A function to represent value is replaced with an Receiver’s State Parameter (RSP), by which designers represent the benefits or costs in SE. Second, Conjoint Analysis and AHP are applied to end users’ evaluation. Conjoint Analysis is carried out using design solution candidates represented with a limited small number of attributes and their levels. The presented method is verified through its application to a food processing machine. © 2006 Katholieke Universiteit Leuven. All rights reserved.

关键词： Value engineering

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The importance of the integration of design methods in robust engineering design

The importance of the integration of design methods in robus...

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15th International Conference on engineering design, ICED 05

作者： Jänsch, J. Bruch, C. Nissl, A. Strasser, C. Darmstadt University of Technology Department Product Development and Machine Elements Magdalenenstr. 4 D-64289 Darmstadt Germany Germany Department for Product Development Technische Universitaet Muenchen Boltzmannstr. 15 D-85748 Garching Germany Vienna University of Technology Institute for Engineering Design Austria

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A unified fatigue life calculation model for notched components based on elastic-plastic fracture mechanics

A unified fatigue life calculation model for notched compone...

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作者： Savaidis, G. Savaidis, A. Hertel, O. Vormwald, M. Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of U Machine Elements and Machine Design GR-54124 Thessaloniki Greece Division of Mechanics Zografou Campus National Technical University of Athens GR-15773 Athens Greece Technische Universität Darmstadt Materials Mechanics Group Petersenstr. 12 D-64287 Darmstadt Germany

Based on Dankert's et al. [1] initial model for the elastic-plastic evaluation of fatigue crack growth in sheets providing elliptical notches, a generalized procedure enabling an improved evaluation of the effective ranges of the crack driving force (i.e. the J-Integral) as well as the application to arbitrary notched components has been developed [2], The present paper presents the basic topics of the calculation model as well as its verification using experimental results from notched specimens with various notch shapes subjected to cyclic loading with various load ratios.

关键词： Crack propagation

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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 Heat and Surface Treatment on the Fatigue Behaviour of 56SiCr7 Spring Steel

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Procedia engineering 2014年 74卷 309-312页

作者： Roselita Fragoudakis Stelios Karditsas Georgios Savaidis Nikolaos Michailidis Tufts University Department of Mechanical Engineering Medford MA 02155 USA Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements & Machine Design Thessaloniki 54124 Greece Aristotle University of Thessaloniki Department of Mechanical Engineering Physical Metallurgy Laboratory Thessaloniki 54124Greece

Heat and surface treatments of spring steels can greatly affect fatigue life by increasing the number of cycles to failure. Heating, quenching and tempering of spring steel will increase its fatigue limit, as tempered martensite formation with an appropriate surface hardness is achieved from an initial ferritic/perlitic microstructure. This study deals with the parameters of the manufacturing process to transforming the initial microstructure of 56SiCr7 steel to tempered martensite, and increasing the surface hardness and fatigue resistance. Microscopy helps determine the decarburized surface layer thickness. Macro- and micro hardness measurements distinguish between core and surface microstructure hardness of the heat-treated steel. Shot-peening induces compressive residual stresses to the surface of the steel, therefore increasing its surface hardness and consequently the number of cycles to failure. This study shows significant hardness increase on the surface of the steel, and verifies how heat- treatment and shot-peening affect surface hardness. Experimental and analytically calculated (FKM guideline) S-N curves at 4- point cyclic bending quantify the individual effects resulting from the applied heat treatment and shot peening on fatigue life.

关键词： Heat Treatmen Shot-peening Tempering Spring Steel Microstructure Surface Hardness Fatigue Life

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