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IEEE International technology Management Conference

作者： Lynn Humpert Amelie Tihlarik Moritz Wäschle Harald Anacker Roman Dumitrescu Albert Albers Bruno Albert Silke Röbenack Sabine Pfeiffer Fraunhofer Institute for Mechatronic System Design Paderborn Germany Chair of Sociology – Technology – Labour – Society Friedrich-Alexander-Universität Erlangen-Nürnberg Nuremberg Germany IPEK – Institute of Product Engineering Karlsruhe Institute of Technology Karlsruhe Germany

Artificial intelligence (AI) has developed rapidly in recent months. In the form of chatbots, texting is becoming easier in our everyday lives. The potential for using this technology in industry is also growing. Small and medium-sized companies, in particular, are still underutilizing the opportunity to use AI in production and development as a competitive advantage or for sustainability goals. People are also often neglected in the introduction of new technologies. From a socio-technical perspective, employees must be explicitly considered as active co-creators and users of AI, whose knowledge of work processes and interactions with technology enriches the design of the human-technology interface and, in the long run, the development of the technology itself. This paper examines how employees have used AI in the past, what their requirements are for their work and collaboration processes, and how they view the possibilities of technologies such as AI. Using a predominantly qualitative approach, this paper describes the socio-technical aspects that companies need to consider. The findings are consistent with previous literature and have been validated in expert workshops. This forms the basis for helping companies to develop this technology for themselves.

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Cooling Lubricant Boundary Conditions for wet Turning Simulations

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Procedia CIRP 2023年 118卷 384-389页

作者： Eckart Uhlmann Enrico Barth Kaissar Nabbout Martin Sommerfeld Benjamin Bock-Marbach Jörg Kuhnert Andrey Dovgal Technische Universität Berlin Institute for Machine Tools and Factory Management (IWF) Chair of Machine Tools and Manufacturing Technology Pascalstr. 8-9 10587 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 10587 Berlin Germany Otto von Guericke University Magdeburg Institute of Process Engineering Universitaetsplatz 2 39106 Magdeburg Germany Fraunhofer Institute for Industrial Mathematics ITWM Fraunhofer-Platz 1 67663 Kaiserslautern Germany

In recent years, the rise in computation and modelling capabilities has enabled first chip formation simulations for wet cutting processes. Currently, chip formation simulations are limited to a small simulation domain around the cutting edge. Hence, vague assumptions of inflow boundary conditions of the cooling lubricant must be made. In this paper, a procedure is shown to determine the boundary conditions of the free fluid jet for different cooling lubricant strategies by combination of Particle Image Velocimetry (PIV) and meshfree fluid simulations. As a result, usual assumptions of cooling lubricant boundary conditions are evaluated and deviations are identified.

关键词： Turning Fluid Simulation

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Load-carrying capacity of MAG butt and fillet welded joints on high-strength structural steels of grade S960QL and S960MC

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ce/papers 2023年第3-4期6卷 587-594页

作者： Brätz, Oliver von Arnim, Mareike Eichler, Stefan Gericke, Andreas Henkel, Knuth-Michael Hildebrand, Jörg Bergmann, Jean Pierre Kuhlmann, Ulrike Fraunhofer IGP Rostock Germany University of Stuttgart Institute of Structural Design Stuttgart Germany Technische Universität Ilmenau Department of Mechanical Engineering Production Technology Group Ilmenau Ilmenau Germany

The use of high-strength structural steels brings great advantages in constructions regarding material requirements, weight reduction and productivity. Different steel grades within the S960 range are commercially available but not yet represented in Eurocode 3. The weldability of these steels is limited to smaller process windows to ensure the high material properties. In contrast to steels with moderate strength, there is a considerable risk of softening in the heat-affected zone causing a strength reduction of the connection. By now, the current EN 1993-1-12 only extends the design rules to cover steel grades up to S700. Therefore, the potential of these high-strength steels cannot be used to its full extent in structural engineering. This study, made within a steel application research project (FOSTA P 1507), deals with the weldability and load-carrying capacity of butt and fillet welded joints of S960QL and S960MC produced by gas-shielded metal arc welding. The influence of different bevel geometry, filler metal, and plate thicknesses was investigated. To extend the design rules up to S960, a need of an amendment was found for some combinations. © 2023 The Authors. Published by Ernst & Sohn GmbH.

关键词： High strength steel

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R-SIEL: a physics-informed learning algorithm for discovering dynamics of serial manipulators

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Expert systems with Applications 2025年 287卷

作者： Omar, Mohamed Li, Ruifeng Wang, Ke Asker, Ahmed State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China Production and Mechanical Design Engineering Department Faculty of Engineering Mansoura University Mansoura35516 Egypt Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450000 China School of Engineering and Applied Sciences Nile University Giza12573 Egypt

Dynamic modeling is essential for serial manipulators’ design and control. Multi-body dynamics simulators, such as SIMULINK and Adams, can precisely replicate a robot's dynamic behavior but are incapable of determining its nonlinear dynamic model. This work aims to identify serial manipulators’ dynamics from simulation data, which extends the capability of using an algorithm that combines the Euler-Lagrange method and sparse identification of nonlinear dynamics (SINDy) with physics-based constraints and Akaike Information Criterion (AICc). The algorithm is called Recursive SINDy Euler-Lagrange (R-SIEL). The Euler-Lagrange method is used to construct a preliminary library of symbolic functions. The physics-informed constraints, which utilize the similarities between the symbolic coefficients of the dynamic equations, are employed to decrease the number of functions in the library to get a constrained library. SINDy is equipped with three kinds of constraints: the constrained library, the dataset, and similarities between links’ dynamic equations. The generation of the three distinct datasets—training, constraints, and testing data—uses simulated data from the MATLAB® SIMULINK environment. The algorithms of sequential threshold least-squares and L0-minimization are coded with the convex optimization package CVX to determine the best dynamic model. The resulting models are tested with the testing dataset, and based on the lowest AICc, the best model is chosen. The proposed algorithm is applied to different serial manipulators: 2DOF robot, Stanford, PRR robot, ABB SCARA, UR5, and KUKA KR4 AGILUS robots. The resulting model is validated with the dynamic model derived using the conventional Euler-Lagrange method. For the considered manipulators, the R-SIEL algorithm shows a high capability to identify the dynamic model compared to the one identified compared to the previous algorithm. © 2025 Elsevier Ltd

关键词： Lagrange multipliers

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Tool wear prevention in ultra-precision polymer machining 20

Tool wear prevention in ultra-precision polymer machining

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20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Uhlmann, E. Fang, F. Polte, J. Hein, C. Lai, M. Dörr, M. Jahnke, C. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Tianjin University China

ISBN: (纸本)9780995775176

Polymers become more relevant in the field of optical components as their optical properties, like refractive index n and wavelength dependent dispersion n = f(λ), can be adjusted easily by additives. Due to their low density ρ polymeric optics are lightweight compared to glasses. The demand for ultra-precision machined polymer lenses is increasing. Small series and individualised components can only be produced economically by using ultra-precision machining. Within theses studies the influence of different measures to reduce diamond tool wear occurring during ultra-precision diamond face turning of polycarbonate (PC) and polysulfone (PSU) will be investigated. Continuous and interrupted face turning experiments are conducted to analyse the effects from separation of the diamond tool and workpiece. Results show increasing tool wear in interrupted cutting. Changes of the environmental conditions in the cutting process show an influence of increasing humidity H on diamond tool wear. This contribution gives a qualitative and quantitative overview on the influencing factors on diamond tool wear in ultra-precision turning of polymers and gives an outlook on strategies to avoid its occurrence. Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Turning

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Validation of Immersive design Parameters in Driving Simulation Environments

Validation of Immersive Design Parameters in Driving Simulat...

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AHFE Virtual Conference on Human Factors and Simulation and the International Conference on Digital Human Modeling and Applied Optimization, 2020

作者： Lyga, Yvonne Lau, Merle Brandenburg, Elisabeth Stark, Rainer Industrial Information Technology Technical University Berlin Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783030510633

Driving simulators are used for the prospective validation of technical systems in the automotive sector. The design of simulation environments can affect drivers and should be considered in investigations of driver-vehicle interactions. The aim of this research is to minimize the gap between driving simulators and real car studies by integrating immersive parameters into simulated driving environments. Stereoscopy, surround sound and motion feedback were analyzed with regard to driver behavior and experience and were then compared to data of a real drive from a previous investigation. The authors conducted a study with N = 48 participants performing a dual-task scenario in a driving simulator. Results reveal significant effects of immersive design parameters on gaze behavior and mental workload. Findings provide guidance for an efficient and cost-effective development of driving simulation environments. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Stereo image processing

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Surface optimization of dental implants with laser surface texturing and silver coating 22

Surface optimization of dental implants with laser surface t...

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22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022

作者： Uhlmann, E. Brehmer, A. Schneider, Peter Hein, C. Schweitzer, L. Fraunhofer Institute for Production Systems and Design Technology Berlin Germany Institute for Machine Tools and Factory Management Technische Universität Berlin Germany Department of Orthopedics and Orthopedic Surgery University Medicine Greifswald Germany Laser Mikrotechnologie D. Kieburg GmbH James-Franck-Straße 15 Berlin12489 Germany

ISBN: (纸本)9781998999118

The risk of bacterial inflammation at the interface between implant and tissue exists following the implantation of a dental prosthesis. Nearly half of implants are at risk of colonisation by pathogenic bacteria, which is associated with the occurrence of peri-implant mucositis. This disease can develop into peri-implantitis and thereby trigger a severe inflammatory process. The occurrence of peri-implantitis includes different phases. The initial attachment of microorganisms is only possible by pioneer bacteria, such as the gram-positive streptococci. Since the pathogenic cannot form a biofilm unless attached to a surface, the attachment of the pioneer bacteria is crucial for the onset of peri-implantitis. Due to the flexibility and contact free process, laser material processing is used for the surface structuring of several materials. In the biomedical field, laser-based surface texturing enables the production of implants with improved biological reaction surfaces to positively influence protein adsorption and cell adhesion. This paper presents laser texturing and silver coating to reduce initial biofilm formation on Ti6Al4V. The laser processing includes the manufacturing of LIPSS (Laser Induced Periodic Surface Structures), which enables the functionalisation of the surface. Furthermore, the surfaces are coated with silver to act as an inhibitor of biofilm formation. The implant material undergoes an in vitro culture of the microorganism Streptococcus salivarius in order to determine the biofilm formation applying both techniques. The analysis was realized by fluorescence microscopy with the application of 4', 6-diamidino-2-phenylindole (DAPI) on the adhered biofilm. Results show that the surface modification plays a major role in the inhibition of biofilm formation. © European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Bacteria

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Constructive compensation of the thermal behaviour for industrial robots 13

Constructive compensation of the thermal behaviour for indus...

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13th International DAAAM Baltic Conference and 29th International Baltic Conference, BALTMATTRIB 2021

作者： Uhlmann, Eckart Polte, Julian Mohnke, Christian Fraunhofer Institute for Production Systems Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany Institute of Machine Tools and Factory Management Pascalstraße 8-9 Berlin10587 Germany

Industrial robot systems offer a flexible, adaptable basis due to their kinematics and their mobility An influencing variable, which is particularly relevant for processes with long process times, is the thermal heating and the associated thermal drift of the tool center point. The maximum deviation from the actual nominal position can reach up to ΔAPt = 1.5 mm. Currently, there are no procedures and methods established in practice which compensate the effects of thermal drift without expensive calibration measures and system downtime. In these investigations a system was developed which allows the reduction of thermally induced displacement by using controlled heating elements. The aim is to keep the entire robot system at a permanent, balanced temperature level. The heating elements are adapted to the geometry of the respective axis and heat the material to a temperature ϑ close to the steady state. A comparison of the drift through the heating system with the error occurring in normal operation shows that the drift of the heating system is comparable with the drift of normal heating. With the heating mats, a thermally induced error of ΔAPt = 0.234 mm can be generated within t = 20 min. While normal heating requires up to t = 600 min. The achieved error deviation of the drift of the self-heating to the heated variants is with ΔAP = 0.04 mm only minimal. The results can help to reduce the influence of thermal heating and the associated thermal drift of the TCP without using cost-intensive measures with additional hardware and software on external computers for compensating the errors. © 2021 DAAAM International. All rights reserved.

关键词： Industrial robots

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Evaluation of the fatigue resistance of butt welds in steel towers of wind turbines by fatigue tests and numerical based design with local approaches 33rd

Evaluation of the fatigue resistance of butt welds in steel ...

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33rd International Ocean and Polar Engineering Conference, ISOPE 2023

作者： Glienke, Ralf Kalkowsky, Florian Hobbacher, Adolf Holch, Alexander Ripsch, Benjamin Günther, Hans-Peter Kersten, Roy Henkel, Knuth-Michael University of Applied Sciences Technology Business and Design Wismar Germany Fraunhofer-Institute for Large Structures in Production Engineering IGP Rostock Germany Jade University of Applied Sciences Wilhelmshaven Germany Stuttgart University of Applied Sciences Department of Civil Engineering Building Physics and Business Management Germany Enercon GmbH Aurich Germany University of Rostock Faculty of Mechanical Engineering and Marine Technologies Rostock Germany

ISBN: (纸本)9781880653807

The fatigue strength verification of constructional details in towers of wind turbines is generally carried out using nominal stresses acc. to the Eurocode 3, part 1-9. Butt-welded joints are one of the most common constructional details in these structures. In this paper, results from fatigue tests on transversely loaded butt welds and FEA using the effective notch stress and the crack propagation approaches are presented. By using macroscopic measurements and a 3D scan, the notch effect of the weld seam geometry was considered in the FEA. These results were compared with results from fatigue tests. Based on the successful alignment between simulation and experiment, the possibility to discuss the fatigue resistance influencing variables from the seam geometry is presented. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Welds

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systematics for an Integrative Modelling of Product and production system

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Procedia CIRP 2023年 118卷 104-109页

作者： Louis Schäfer Matthias Günther Alex Martin Mariella Lüpfert Constantin Mandel Simon Rapp Gisela Lanza Harald Anacker Albert Albers Daniel Köchling wbk – Institute of Production Science Karlsruhe Institute of Technology (KIT) Kaiserstr. 12 76131 Karlsruhe Germany Fraunhofer Institute for Mechatronic Systems Design (IEM) Zukunftsmeile 1 33102 Paderborn Germany IPEK – Institute of Product Engineering Karlsruhe Institute of Technology (KIT) Kaiserstr. 10 76131 Karlsruhe Germany BENTELER Automobiltechnik GmbH An der Talle 27 – 31 33102 Paderborn Germany

Due to shorter product life-cycles, manufacturing companies nowadays must maximize efficiency in development and planning of products and production systems. To achieve this, new methods and tools are required to cope with increasing product variants and system complexity. Therefore, we propose a holistic systematics to develop a consistent, model-based architecture for products, production systems and their interdependencies. For this, we give a domain-specific ontology containing model elements, relationships and attributes. Ontology and systematics are applied to a use-case from the automotive industry. In summary, the approach deals with modern-day demands in engineering by considering interdependencies between product and production systems.

关键词： Model-Based systems Engineering Advanced systems Engineering Product-production-Codesign

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