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Simulation Winter Conference

作者： Moritz Poeting Bastian Prell Markus Rabe Tobias Uhlig Sigrid Wenzel Institute of Transport Logistics TU Dortmund University Dortmund GERMANY Department Factory of the Future Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz GERMANY Department IT in Production and Logistics TU Dortmund University Dortmund GERMANY Department of Computer Science Universität der Bundeswehr München Neubiberg GERMANY Department of Organization of Production and Factory Planning University of Kassel Kassel GERMANY

ISBN: (数字)9781728132839

ISBN: (纸本)9781728120522

Traditionally, aspects such as emissions and energy consumption have to be taken into account for environmental and economic reasons when it comes to transport. In other areas of logistics, such as production logistics and intralogistics, the energy aspect is also becoming increasingly important. Existing literature has been recently reviewed in a contribution of the Arbeitsgemeinschaft Simulation (ASIM) to the Winter Simulation Conference 2018 (Uhlig et al. 2018) to develop a map of common approaches and best practices for manufacturing and logistics systems. In the paper presented here, as a complement we are focusing on the application of energy simulation in logistics to give a comprehensive overview and present exemplary case studies. Furthermore, we show a classification of approaches to combine energy aspects with simulation. Finally, we will discuss open questions and future trends in this field of research.

关键词： tools Mathematical model Supply chains Matlab Adaptation models

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Requirements and Tasks for Active Energy Management Systems in Automotive Industry

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Procedia Manufacturing 2017年 8卷 175-182页

作者： Franz, Enrico Erler, Felix Langer, Tino Schlegel, Andreas Stoldt, Johannes Richter, Mark Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz 09126 Germany ACOD GmbH Schillerstraße 5 Leipzig 04109 Germany

The “2020 climate and energy package” enacted by the EU aims to reduce emission of greenhouse gases, to increase the share of renewable energy and to improve overall energy efficiency. These goals are forwarded to the industry using regulations or funding opportunities. Taking a deeper look e.g. into automotive industry the companies reflect these goals to their plants across Europe. Energy efficiency is a plant-related KPI to gain customer satisfaction, enhance greener production and optimise internal costs. Current developments especially deal with base load reduction for production plants. In order to achieve this, all resources within the factory, interconnected by processes or by energy flows, have to be actively managed. This paper deals with the requirements on energy management systems stemming from the task to control production, infrastructure as well as technical building systems (TBS) simultaneously with focus on specifics of the automotive industry. © 2017

关键词： automotive energy management system energy storage management flexibility production planing and control

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Investigation of various graphene fillers for improving properties of thermoplastic polymers 17

Investigation of various graphene fillers for improving prop...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Edelmann, Jan Albrecht, Mirko Zeidler, Henning Gehde, Michael Schubert, Andreas Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Chemnitz University of Technology Plastics Chemnitz Germany Chemnitz University of Technology Micromanufacturing Technology Chemnitz Germany

ISBN: (纸本)9780995775107

The application of graphene in polymers and polymer-based composites was investigated in an application-oriented research project. The aim was the improvement of mechanical, electrical and thermal properties by using graphene as nanofiller in the polymer matrix. Research concentrated on developing appropriate formulations of graphene-based plastics for functionally integrated components, which can be processed in an industrial environment. Since most of recent studies have been done in lab environment, guaranteeing ideal processing conditions not relevant in industrial production, the approach of this project was hallmarked by using industrial equipment for compounding and further processing.

关键词： Graphene

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In-process monitoring of joining operations for piezoceramic elements 21st

In-process monitoring of joining operations for piezoceramic...

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21st Symposium on Composites, 2017

作者： Müller, Benedikt Pierer, Alexander Schmidt, Marek Schubert, Andreas Koriath, Hans-Joachim Putz, Matthias Wittstock, Volker Chemnitz University of Technology Prof. Micromanufacturing Technology Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany Chemnitz University of Technology Prof. for Machine Tools and Forming Technology Reichenhainer Str. 70 Chemnitz09126 Germany

ISBN: (纸本)9783035711981

The direct integration of piezo elements into micro-structured aluminum sheets is a new approach for adaptronics and lightweight constructions. With the integration of the active piezoceramic elements the aluminum sheets gain sensor and actuator functionalities. The mechanical interconnections and the preload of the piezoceramic elements are an important issue for the sensor and actuator capability of the later smart material. Post-process inspection methods to characterize the mechanical interconnection of the joining partners and the performance of the transducer after the joining operation are state of the art. Scope of the research presented in this paper is the development of a novel in-process monitoring method that utilizes the piezoceramic transducer as inherent sensor for failure mode detection and preload evaluation during the joining by forming operation. Within this study, results of forming experiments with array batches of interconnected piezoceramic elements are presented. The piezoceramic batches are electrically contacted inside the joining tool and utilized as material inherent sensor during joining by forming experiments. Test samples are characterized by impedance spectroscopy during the joining operation. Based on the experimental results, a novel in-process-monitoring method utilizing the piezoceramic joining partners as inherent sensor is outlined. It is shown, that with this method a sufficient preload can be adjusted on the basis of the intensity of the resonance peak without an overload. Furthermore, error effects to the transducer can be detected at an early stage. © 2017 Trans Tech Publications, Switzerland.

关键词： Process monitoring

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Finite element simulations on the relation of microstructural characteristics and the formation of different types of adiabatic shear bands in a β-titanium alloy

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IOP Conference Series: Materials Science and Engineering 2019年第1期480卷

作者： S Winter S Pfeiffer T Bergelt M F-X Wagner Institute of Materials Science and Engineering Materials Science Group Chemnitz University of Technology 09125 Chemnitz Germany now at Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

Deformation at high strain rates in combination with local thermal softening can lead to the formation of so-called adiabatic shear bands. These shear bands occur when the macroscopic deformation is concentrated in microscopic areas. The fundamental thermomechanical processes and micromechanical mechanisms acting during adiabatic shear band formation are not fully understood yet. In particular, the influence of different initial microstructures on shear band formation has not sufficiently clarified. In an earlier investigation, adiabatic shear bands formed in a β-titanium alloy with different initial microstructures were characterized in detail. It was shown that different volume fractions of the α-phase result in the formation of different types of shear bands. In the present study, a simple modeling approach based on the finite element (FE) method is used to investigate in a systematic parameter study (with a special focus on mechanical and thermal variables) how these different types of adiabatic shear bands can occur in the same material. The FE simulations clearly show that microstructural characteristics – such as size and volume fraction of the α-phase in the β-titanium alloy – have a strong influence on shear band formation. This study contributes to a more detailed understanding of the microstructural and thermomechanical mechanisms leading to the formation of different types of adiabatic shear bands in titanium alloys.

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Publisher Correction: Non-cuttable material created through local resonance and strain rate effects

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Scientific reports 2020年第1期10卷 19103页

作者： Stefan Szyniszewski Rene Vogel Florian Bittner Ewa Jakubczyk Miranda Anderson Manuel Pelacci Ajoku Chinedu Hans-Josef Endres Thomas Hipke Durham University Durham United Kingdom. s.szyniszewski@***. Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany. Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut WKI Hannover Germany. Leibniz University Hannover Institute of Plastics and Circular Economy IKK Garbsen Germany. University of Surrey Guildford United Kingdom. University of Stirling Stirling United Kingdom.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Application of laser scanning as a Pre-machining metrology technique in Jet-ECM 17

Application of laser scanning as a Pre-machining metrology t...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Zanjani, Matin Yahyavi Zeidler, Henning Martin, André Schubert, Andreas Prof. Micromanufacturing Technology Faculty of Mechanical Engineering Technische Universität Chemnitz Chemnitz09107 Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz09126 Germany

ISBN: (纸本)9780995775107

In Electrochemical Machining (ECM), where the material removal takes place based on the anodic dissolution of the workpiece material, the working distance is one of the most important parameters. Especially in Jet Electrochemical Machining (Jet-ECM), where a micro nozzle is moved over the initial surface of the workpiece in order to apply an electrolytic free jet to produce the desired shapes, the distance between the nozzle and the workpiece becomes even more important. On the one hand a small working distance is aspired to achieve high current densities resulting in a high efficiency of the process. On the other hand the working distance needs to be large enough to avoid damages on the micro nozzle caused by electrical discharges or mechanical contact. Hence, the adjustment of the working gap is essential to realize a precise, effective and secure Jet-ECM process. The control of the gap size is done based on the data gathered before machining by surface measurement. Until now, the initial surface has been detected by electrostatic probing through moving the nozzle stepwise to the work piece surface and detect the voltage drop between the nozzle and the work piece. With this strategy, only a limited number of points can be detected within adequate time. Hence, in most cases only three points of the initial surface are detected in order to adjust the working distance according to the planar inclination of the workpiece. The coordinates of the three detected points are used to calculate the normal vector of the initial surface. In recent studies, another strategy was analysed, which is realized by dividing the surface into smaller areas and respectively calculating the normal vector of each area in order to obtain more accurate data of the initial surface. A further strategy is to use probing along the machining path of the tool and to gather the coordinates of a number of points along the path. The above mentioned methods usually do not ensure the precise control of

关键词： Surface analysis

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Process analysis for magnetic pulse welding of similar and dissimilar material sheet metal joints

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Procedia Engineering 2017年 207卷 353-358页

作者： Verena Psyk Christian Scheffler Maik Linnemann Dirk Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Strasse 88 09126 Chemnitz Germany

Magnetic pulse welding (MPW) is an impact welding technology for producing metallic bonds of similar and dissimilar materials offering advantages such as avoidance of temperature induced problems. Based on the parameters describing the collision of the joining partners, specifically the impact angle and impact velocity, so-called welding windows describe whether or not welding will be successful for a specific material combination. However, as in MPW collision parameters depend on equipment and setup dependent parameters, using these welding windows for process design requires knowledge about the adjustment of the collision parameters via the adjustable process parameters. Therefore, the influence of adjustable process parameters on collision parameters and resulting weld quality is analyzed and trends, for a target oriented process and joint design, are deduced. Specifically, joining of copper to aluminum, copper to copper, aluminum to copper and aluminum to stainless steel is regarded.

关键词： Magnetic pulse welding Process analysis Multi-material joints

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Simulation of Error-prone Continuous Generating Production Processes of Helical Gears and the Influence on the Vibration Excitation in Gear Mesh

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Procedia CIRP 2017年 62卷 256-261页

作者： Simon Kimme Ruben Bauer Welf-Guntram Drossel Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Str. 44 01187 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenainer Str. 88 09126 Chemnitz Germany

A very important feature of high quality gears is a low noise emission in all operating conditions. Micro-geometry of the gear is of relevance for the vibration excitation in the tooth contact and significantly affected by the manufacturing process, especially the finishing operations. Besides known process related effects, uncontrolled variations such as inaccuracies in the speed synchronization of different axes or vibrations influence the surface structure of the tooth flanks. In this paper a detailed simulation of the production process is presented, providing crucial information about characteristic process properties and enabling investigations on the impact of manufacturing process on gear mesh acoustics.

关键词： simulation of gear machining defective cutting process acoustic relevant vibrations

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Designing a Flawless Hem Flange Bonding Process

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ADHESION ADHESIVES&SEALANTS 2017年第3期14卷 26-29页

作者： Wolfgang Woyke Fred Jesche Sandra Menzel Dirk Landgrebe Volkswagen AG Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Germany

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