@article{HaagZontarSchleupenetal.2014,
  author    = {Haag, S. and Zontar, D. and Schleupen, Josef and M{\"u}ller, T. and Brecher, C.},
  title     = {Chain of refined perception in self-optimizing assembly of micro-optical systems},
  series = {Journal of sensors and sensor systems},
  volume    = {3},
  journal   = {Journal of sensors and sensor systems},
  number    = {1},
  publisher = {Copernicus Publ.},
  address   = {G{\"o}ttingen},
  issn      = {2194-878X},
  doi       = {10.5194/jsss-3-87-2014},
  pages     = {87 -- 95},
  year      = {2014},
  abstract  = {Today, the assembly of laser systems requires a large share of manual operations due to its complexity regarding the optimal alignment of optics. Although the feasibility of automated alignment of laser optics has been shown in research labs, the development effort for the automation of assembly does not meet economic requirements - especially for low-volume laser production. This paper presents a model-based and sensor-integrated assembly execution approach for flexible assembly cells consisting of a macro-positioner covering a large workspace and a compact micromanipulator with camera attached to the positioner. In order to make full use of available models from computer-aided design (CAD) and optical simulation, sensor systems at different levels of accuracy are used for matching perceived information with model data. This approach is named "chain of refined perception", and it allows for automated planning of complex assembly tasks along all major phases of assembly such as collision-free path planning, part feeding, and active and passive alignment. The focus of the paper is put on the in-process image-based metrology and information extraction used for identifying and calibrating local coordinate systems as well as the exploitation of that information for a part feeding process for micro-optics. Results will be presented regarding the processes of automated calibration of the robot camera as well as the local coordinate systems of part feeding area and robot base.},
  language  = {en}
}
@article{RieperGebhardtStucker2016,
  author    = {Rieper, Harald and Gebhardt, Andreas and Stucker, Brent},
  title     = {Selective Laser Melting of the Eutectic Silver-Copper Alloy Ag 28 wt \% Cu},
  series = {RTejournal - Forum f{\"u}r Rapid Technologie},
  volume    = {13},
  journal   = {RTejournal - Forum f{\"u}r Rapid Technologie},
  issn      = {1614-0923},
  url       = {http://nbn-resolving.de/nbn:de:0009-2-44141},
  year      = {2016},
  abstract  = {The aim of this work was to perform a detailed investigation of the use of Selective Laser Melting (SLM) technology to process eutectic silver-copper alloy Ag 28 wt. \% Cu (also called AgCu28). The processing occurred with a Realizer SLM 50 desktop machine. The powder analysis (SEM-topography, EDX, particle distribution) was reported as well as the absorption rates for the near-infrared (NIR) spectrum. Microscope imaging showed the surface topography of the manufactured parts. Furthermore, microsections were conducted for the analysis of porosity. The Design of Experiments approach used the response surface method in order to model the statistical relationship between laser power, spot distance and pulse time.},
  language  = {en}
}
@inproceedings{KesslerBalcGebhardt2016,
  author    = {Kessler, Julia and Balc, Nicolae and Gebhardt, Andreas},
  title     = {Basic research on lattice structures focused on the strut shape and welding beads},
  series = {Physics Procedia},
  volume    = {Vol. 83},
  booktitle = {Physics Procedia},
  issn      = {1875-3884},
  doi       = {10.1016/j.phpro.2016.08.086},
  pages     = {833 -- 838},
  year      = {2016},
  language  = {en}
}
@article{MichauxMatternKallweit2018,
  author    = {Michaux, F. and Mattern, P. and Kallweit, Stephan},
  title     = {RoboPIV: how robotics enable PIV on a large industrial scale},
  series = {Measurement Science and Technology},
  volume    = {29},
  journal   = {Measurement Science and Technology},
  number    = {7},
  publisher = {IOP},
  address   = {Bristol},
  issn      = {1361-6501},
  doi       = {10.1088/1361-6501/aab5c1},
  pages     = {074009},
  year      = {2018},
  abstract  = {This work demonstrates how the interaction between particle image velocimetry (PIV) and robotics can massively increase measurement efficiency. The interdisciplinary approach is shown using the complex example of an automated, large scale, industrial environment: a typical automotive wind tunnel application. Both the high degree of flexibility in choosing the measurement region and the complete automation of stereo PIV measurements are presented. The setup consists of a combination of three robots, individually used as a 6D traversing unit for the laser illumination system as well as for each of the two cameras. Synchronised movements in the same reference frame are realised through a master-slave setup with a single interface to the user. By integrating the interface into the standard wind tunnel management system, a single measurement plane or a predefined sequence of several planes can be requested through a single trigger event, providing the resulting vector fields within minutes. In this paper, a brief overview on the demands of large scale industrial PIV and the existing solutions is given. Afterwards, the concept of RoboPIV is introduced as a new approach. In a first step, the usability of a selection of commercially available robot arms is analysed. The challenges of pose uncertainty and importance of absolute accuracy are demonstrated through comparative measurements, explaining the individual pros and cons of the analysed systems. Subsequently, the advantage of integrating RoboPIV directly into the existing wind tunnel management system is shown on basis of a typical measurement sequence. In a final step, a practical measurement procedure, including post-processing, is given by using real data and results. Ultimately, the benefits of high automation are demonstrated, leading to a drastic reduction in necessary measurement time compared to non-automated systems, thus massively increasing the efficiency of PIV measurements.},
  language  = {en}
}
@article{KunkelGebhardtMpofuetal.2018,
  author    = {Kunkel, Maximilian Hugo and Gebhardt, Andreas and Mpofu, Khumbaulani and Kallweit, Stephan},
  title     = {Statistical assessment of mechanical properties of selective laser melted specimens of stainless steel},
  series = {The International Journal of Advanced Manufacturing Technology},
  volume    = {98},
  journal   = {The International Journal of Advanced Manufacturing Technology},
  number    = {5-8},
  publisher = {Springer},
  address   = {London},
  issn      = {0268-3768},
  doi       = {10.1007/s00170-018-2040-8},
  pages     = {1409 -- 1431},
  year      = {2018},
  abstract  = {The rail business is challenged by long product life cycles and a broad spectrum of assembly groups and single parts. When spare part obsolescence occurs, quick solutions are needed. A reproduction of obsolete parts is often connected to long waiting times and minimum lot quantities that need to be purchased and stored. Spare part storage is therefore challenged by growing stocks, bound capital and issues of part ageing. A possible solution could be a virtual storage of spare parts which will be 3D printed through additive manufacturing technologies in case of sudden demand. As mechanical properties of additive manufactured parts are neither guaranteed by machine manufacturers nor by service providers, the utilization of this relatively young technology is impeded and research is required to address these issues. This paper presents an examination of mechanical properties of specimens manufactured from stainless steel through the selective laser melting (SLM) process. The specimens were produced in multiple batches. This paper interrogates the question if the test results follow a normal distribution pattern and if mechanical property predictions can be made. The results will be put opposite existing threshold values provided as the industrial standard. Furthermore, probability predictions will be made in order to examine the potential of the SLM process to maintain state-of-the-art mechanical property requirements.},
  language  = {en}
}
@inproceedings{RieperGebhardtStucker2016,
  author    = {Rieper, Harald and Gebhardt, Andreas and Stucker, Brent},
  title     = {Process parameters for Selective Laser Melting of AgCu7},
  series = {DDMC, Fraunhofer Direct Digital Manufacturing Conference, 3},
  booktitle = {DDMC, Fraunhofer Direct Digital Manufacturing Conference, 3},
  publisher = {Fraunhofer-Verlag},
  address   = {Stuttgart},
  isbn      = {978-3-8396-1001-5},
  pages     = {171 -- 176},
  year      = {2016},
  language  = {en}
}
@incollection{FranzenSteckenPfaffetal.2019,
  author    = {Franzen, Julian and Stecken, Jannis and Pfaff, Raphael and Kuhlenk{\"o}tter, Bernd},
  title     = {Using the Digital Shadow for a Prescriptive Optimization of Maintenance and Operation : The Locomotive in the Context of the Cyber-Physical System},
  series = {Advances in Production, Logistics and Traffic},
  booktitle = {Advances in Production, Logistics and Traffic},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-13535-5},
  doi       = {10.1007/978-3-030-13535-5_19},
  pages     = {265 -- 276},
  year      = {2019},
  abstract  = {In competition with other modes of transport, rail freight transport is looking for solutions to become more attractive. Short-term success can be achieved through the data-driven optimization of operations and maintenance as well as the application of novel strategies such as prescriptive maintenance. After introducing the concept of prescriptive maintenance, this paper aims to prove that vehicle-focused applications of this approach indeed have the potential to increase attractiveness. However, even greater advantages can be activated if data from the horizontal network of the vehicle is available. Drawing on the state of the art in research and technology in the field of cyber-physical systems (CPS) as well as digital twins and shadows, our work serves to design a system of systems for the horizontal interconnection of a rail vehicle and to conceptualize a draft for a digital twin of a locomotive.},
  language  = {en}
}
@inproceedings{BraunChengLaietal.2019,
  author    = {Braun, Sebastian and Cheng, Chi-Tsun and Lai, Chow Yin and Wollert, J{\"o}rg},
  title     = {Microservice Architecture for Automation - Realization by the example of a model-factory's manufacturing execution system},
  series = {Proceedings of the 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  booktitle = {Proceedings of the 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  pages     = {33 -- 37},
  year      = {2019},
  language  = {en}
}
@inproceedings{LuftGebhardtBalc2019,
  author    = {Luft, Angela and Gebhardt, Andreas and Balc, Nicolae},
  title     = {Challenges of additive manufacturing in production systems},
  series = {Modern technologies in manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern technologies in manufacturing (MTeM 2019)},
  number    = {Article 01003},
  doi       = {10.1051/matecconf/201929901003},
  pages     = {6 Seiten},
  year      = {2019},
  language  = {en}
}
@inproceedings{AbbasThurnKessleretal.2019,
  author    = {Abbas, Karim and Thurn, Laura and Kessler, Julia and Eichler, Fabian},
  title     = {Basic research of the consideration of additive manufactured lattice structures under thermoand fluid dynamic loads},
  series = {Modern technologies in manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern technologies in manufacturing (MTeM 2019)},
  number    = {Article 01009},
  doi       = {10.1051/matecconf/201929901009},
  pages     = {8 Seiten},
  year      = {2019},
  language  = {en}
}
@inproceedings{EichlerSkupinThurnetal.2019,
  author    = {Eichler, Fabian and Skupin, Marco and Thurn, Laura and Kasch, Susanne and Schmidt, Thomas},
  title     = {Operating limits for beam melting of glass materials},
  series = {Modern Technologies in Manufacturing (MTeM 2019)},
  volume    = {299},
  booktitle = {Modern Technologies in Manufacturing (MTeM 2019)},
  number    = {Article 01004},
  doi       = {10.1051/matecconf/201929901004},
  pages     = {8 Seiten},
  year      = {2019},
  abstract  = {Laser-based Additive Manufacturing (AM) processes for the use of metals out of the powder bed have been investigated profusely and are prevalent in industry. Although there is a broad field of application, Laser Powder Bed Fusion (LPBF), also known as Selective Laser Melting (SLM) of glass is not fully developed yet. The material properties of glass are significantly different from the investigated metallic material for LPBF so far. As such, the process cannot be transferred, and the parameter limits and the process sequence must be redefined for glass. Starting with the characterization of glass powders, a parameter field is initially confined to investigate the process parameter of different glass powder using LPBFprocess. A feasibility study is carried out to process borosilicate glass powder. The effects of process parameters on the dimensional accuracy of fabricated parts out of borosilicate and hints for the post-processing are analysed and presented in this paper.},
  language  = {en}
}
@inproceedings{GerhardsSchleserOttenetal.2019,
  author    = {Gerhards, Benjamin and Schleser, Markus and Otten,, Christian and Schwarz, Alexander and Gebhardt, Andreas},
  title     = {Innovative Laser Beam Joining Technology for Additive Manufactured Parts},
  series = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  booktitle = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  pages     = {1 -- 8},
  year      = {2019},
  language  = {en}
}
@inproceedings{GerhardsSchleserOtten2019,
  author    = {Gerhards, Benjamin and Schleser, Markus and Otten, Christian},
  title     = {Advancements of mobile vacuum laser welding for industrial thick sheet applications},
  series = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  booktitle = {Conference Proceedings 72nd IIW Annual Assembly and International Conference, 7-12 July 2019, Bratislava},
  pages     = {1 -- 8},
  year      = {2019},
  language  = {en}
}
@article{WollbrinkMasloZimmeretal.2020,
  author    = {Wollbrink, Moritz and Maslo, Semir and Zimmer, Daniel and Abbas, Karim and Arntz, Kristian and Bergs, Thomas},
  title     = {Clamping and substrate plate system for continuous additive build-up and post-processing of metal parts},
  series = {Procedia CIRP},
  volume    = {93},
  journal   = {Procedia CIRP},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {2212-8271},
  doi       = {10.1016/j.procir.2020.04.015},
  pages     = {108 -- 113},
  year      = {2020},
  abstract  = {The manufacturing share of laser powder bed fusion (L-PBF) increases in industrial application, but still many process steps are manually operated. Additionally, it is not possible to achieve tight dimensional tolerances or low surfaces roughness. Hence, a process chain has to be set up to combine additive manufacturing (AM) with further machining technologies. To achieve a continuous workpiece flow as basis for further industrialization of L-PBF, the paper presents a novel substrate system and its application on L-PBF machines and post-processing. The substrate system consists of a zero-point clamping system and a matrix-like interface of contact pins to be substantially connected to the workpiece within the L-PBF process.},
  language  = {en}
}
@incollection{FateriGebhardt2020,
  author    = {Fateri, Miranda and Gebhardt, Andreas},
  title     = {Introduction to Additive Manufacturing},
  series = {3D Printing of Optical Components},
  booktitle = {3D Printing of Optical Components},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-58960-8},
  doi       = {10.1007/978-3-030-58960-8_1},
  pages     = {1 -- 22},
  year      = {2020},
  abstract  = {Additive manufacturing (AM) works by creating objects layer by layer in a manner similar to a 2D printer with the "printed" layers stacked on top of each other. The layer-wise manufacturing nature of AM enables fabrication of freeform geometries which cannot be fabricated using conventional manufacturing methods as a one part. Depending on how each layer is created and bonded to the adjacent layers, different AM methods have been developed. In this chapter, the basic terms, common materials, and different methods of AM are described, and their potential applications are discussed.},
  language  = {en}
}
@inproceedings{ChavezBermudezWollert2019,
  author    = {Chavez Bermudez, Victor Francisco and Wollert, J{\"o}rg},
  title     = {Gateway for Automation Controllers and Cloud based Voice Recognition Services},
  series = {KommA, 10. Jahreskolloquium Kommunikation in der Automation},
  booktitle = {KommA, 10. Jahreskolloquium Kommunikation in der Automation},
  publisher = {Institut f{\"u}r Automation und Kommunikation},
  address   = {Magdeburg},
  organization    = {KommA, 2019, Jahreskolloquium Kommunikation in der Automation, 10., Lemgo, DE, 2019-11-20 - 2019-11-21},
  isbn      = {978-3-944722-85-6},
  pages     = {1 -- 8},
  year      = {2019},
  language  = {en}
}
@incollection{GebhardtHoetter2019,
  author    = {Gebhardt, Andreas and Hoetter, Jan-Steffen},
  title     = {Rapid Tooling},
  series = {CIRP Encyclopedia of Production Engineering},
  booktitle = {CIRP Encyclopedia of Production Engineering},
  publisher = {Springer},
  address   = {Berlin, Heidelberg},
  isbn      = {978-3-662-53120-4},
  doi       = {10.1007/978-3-662-53120-4},
  pages     = {39 -- 52},
  year      = {2019},
  language  = {en}
}
@inproceedings{ChavezBermudezWollert2020,
  author    = {Chavez Bermudez, Victor Francisco and Wollert, J{\"o}rg},
  title     = {Arduino based Framework for Rapid Application Development of a Generic IO-Link interface},
  series = {Kommunikation und Bildverarbeitung in der Automation. Ausgew{\"a}hlte Beitr{\"a}ge der Jahreskolloquien KommA und BVAu 2018},
  booktitle = {Kommunikation und Bildverarbeitung in der Automation. Ausgew{\"a}hlte Beitr{\"a}ge der Jahreskolloquien KommA und BVAu 2018},
  publisher = {Springer Vieweg},
  address   = {Berlin},
  isbn      = {978-3-662-59895-5},
  doi       = {10.1007/978-3-662-59895-5_2},
  pages     = {21 -- 33},
  year      = {2020},
  abstract  = {The implementation of IO-Link in the automation industry has increased over the years. Its main advantage is it offers a digital point-to-point plugand-play interface for any type of device or application. This simplifies the communication between devices and increases productivity with its different features like self-parametrization and maintenance. However, its complete potential is not always used. The aim of this paper is to create an Arduino based framework for the development of generic IO-Link devices and increase its implementation for rapid prototyping. By generating the IO device description file (IODD) from a graphical user interface, and further customizable options for the device application, the end-user can intuitively develop generic IO-Link devices. The peculiarity of this framework relies on its simplicity and abstraction which allows to implement any sensor functionality and virtually connect any type of device to an IO-Link master. This work consists of the general overview of the framework, the technical background of its development and a proof of concept which demonstrates the workflow for its implementation.},
  language  = {en}
}
@inproceedings{KaschSchmidtEichleretal.2020,
  author    = {Kasch, Susanne and Schmidt, Thomas and Eichler, Fabian and Thurn, Laura and Jahn, Simon and Bremen, Sebastian},
  title     = {Solution approaches and process concepts for powder bed-based melting of glass},
  series = {Industrializing Additive Manufacturing. Proceedings of AMPA2020},
  booktitle = {Industrializing Additive Manufacturing. Proceedings of AMPA2020},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-54333-4 (Print)},
  doi       = {10.1007/978-3-030-54334-1_7},
  pages     = {82 -- 95},
  year      = {2020},
  abstract  = {In the study, the process chain of additive manufacturing by means of powder bed fusion will be presented based on the material glass. In order to reliably process components additively, new concepts with different solutions were developed and investigated. Compared to established metallic materials, the properties of glass materials differ significantly. Therefore, the process control was adapted to the material glass in the investigations. With extensive parameter studies based on various glass powders such as borosilicate glass and quartz glass, scientifically proven results on powder bed fusion of glass are presented. Based on the determination of the particle properties with different methods, extensive investigations are made regarding the melting behavior of glass by means of laser beams. Furthermore, the experimental setup was steadily expanded. In addition to the integration of coaxial temperature measurement and regulation, preheating of the building platform is of major importance. This offers the possibility to perform 3D printing at the transformation temperatures of the glass materials. To improve the component's properties, the influence of a subsequent heat treatment was also investigated. The experience gained was incorporated into a new experimental system, which allows a much better exploration of the 3D printing of glass. Currently, studies are being conducted to improve surface texture, building accuracy, and geometrical capabilities using three-dimensional specimen. The contribution shows the development of research in the field of 3D printing of glass, gives an insight into the machine and process engineering as well as an outlook on the possibilities and applications.},
  language  = {en}
}
@inproceedings{ThurnGebhardt2017,
  author    = {Thurn, Laura and Gebhardt, Andreas},
  title     = {Arousing Enthusiasm for STEM: Teaching 3D Printing Technology},
  series = {Conference Proceedings: New Perspectives in Science Education},
  booktitle = {Conference Proceedings: New Perspectives in Science Education},
  publisher = {liberiauniversitaria.it},
  address   = {Padua},
  isbn      = {978-88-6292-847-2},
  pages     = {87 -- 92},
  year      = {2017},
  language  = {en}
}
@inproceedings{KleineKallweitMichauxetal.2016,
  author    = {Kleine, Harald and Kallweit, Stephan and Michaux, Frank and Havermann, Marc and Olivier, Herbert},
  title     = {PIV Measurement of Shock Wave Diffraction},
  series = {18th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2016, Lissabon},
  booktitle = {18th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2016, Lissabon},
  pages     = {1 -- 14},
  year      = {2016},
  language  = {en}
}
@inproceedings{SchleupenEngemannBagherietal.2016,
  author    = {Schleupen, Josef and Engemann, Heiko and Bagheri, Mohsen and Kallweit, Stephan},
  title     = {The potential of SMART climbing robot combined with a weatherproof cabin for rotor blade maintenance},
  series = {17th European Conference on Composite Materials - ECCM, Munich, Germany},
  booktitle = {17th European Conference on Composite Materials - ECCM, Munich, Germany},
  pages     = {1 -- 8},
  year      = {2016},
  language  = {en}
}
@inproceedings{ThurnBalcGebhardtetal.2017,
  author    = {Thurn, Laura and Balc, Nicolae and Gebhardt, Andreas and Kessler, Julia},
  title     = {Education packed in technology to promote innovations: Teaching Additive Manufacturing based on a rolling Lab},
  series = {Modern Technologies in Manufacturing (MTeM 2017 - AMaTUC)},
  booktitle = {Modern Technologies in Manufacturing (MTeM 2017 - AMaTUC)},
  issn      = {2261-236X},
  doi       = {10.1051/matecconf/201713702013},
  pages     = {6 Seiten},
  year      = {2017},
  language  = {en}
}
@inproceedings{BueckingPfaffDirksmeier2018,
  author    = {B{\"u}cking, Henrik and Pfaff, Raphael and Dirksmeier, Roger},
  title     = {Sensor positioning and thermal model for condition monitoring of pressure gas reservoirs in vehicles},
  series = {Proceedings of the Fourth European Conference of the Prognostics and Health Management Society, Utrecht, Netherlands, 2018},
  booktitle = {Proceedings of the Fourth European Conference of the Prognostics and Health Management Society, Utrecht, Netherlands, 2018},
  pages     = {5 Seiten},
  year      = {2018},
  language  = {en}
}
@inproceedings{GaoBabilonPfaffetal.2018,
  author    = {Gao, H. and Babilon, Katharina and Pfaff, Raphael and Gan, F. and Reich, A.},
  title     = {Model of wheel-rail contact for sanding and adhesion enhancement},
  series = {Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018},
  booktitle = {Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018},
  isbn      = {978-946186963-0},
  pages     = {314 -- 321},
  year      = {2018},
  language  = {en}
}
@article{FranzenPindersPfaffetal.2018,
  author    = {Franzen, Julius and Pinders, Erik and Pfaff, Raphael and Enning, Manfred},
  title     = {RailCrowd's virtual fleets: Make most of your asset data},
  series = {Deine Bahn},
  journal   = {Deine Bahn},
  number    = {9},
  publisher = {Bahn-Fachverlag},
  address   = {Berlin},
  issn      = {0948-7263},
  pages     = {11 -- 13},
  year      = {2018},
  abstract  = {For smaller railway operators or those with a diverse fleet, it can be difficult to collect sufficient data to improve maintenance programs. At the same time, new rules such as entity in charge of maintenance - ECM - regulations impose an additional workload by requiring a dedicated maintenance management system and specific reports. The RailCrowd platform sets out to facilitate compliance with ECM and similar regulations while at the same time pooling anonymised fleet data across operators to form virtual fleets, providing greater data insights.},
  language  = {en}
}
@inproceedings{PfaffMelcherFranzen2018,
  author    = {Pfaff, Raphael and Melcher, Karin and Franzen, Julian},
  title     = {Rare event simulation to optimise maintenance intervals of safety critical redundant subsystems},
  series = {Proceedings of the European Conference of the PHM Society},
  volume    = {4},
  booktitle = {Proceedings of the European Conference of the PHM Society},
  number    = {1},
  pages     = {1 -- 6},
  year      = {2018},
  language  = {en}
}
@inproceedings{WiesenEngemannLimpertetal.2018,
  author    = {Wiesen, Patrick and Engemann, Heiko and Limpert, Nicolas and Kallweit, Stephan},
  title     = {Learning by Doing - Mobile Robotics in the FH Aachen ROS Summer School},
  series = {European Robotics Forum 2018, TRROS18 Workshop},
  booktitle = {European Robotics Forum 2018, TRROS18 Workshop},
  pages     = {47 -- 58},
  year      = {2018},
  language  = {en}
}
@inproceedings{ThurnGebhardt2018,
  author    = {Thurn, Laura and Gebhardt, Andreas},
  title     = {Strategy of Education on Materials for Students},
  series = {Conference Proceedings: „New Perspectives in Science Education"},
  booktitle = {Conference Proceedings: „New Perspectives in Science Education"},
  address   = {Florence, Italy},
  isbn      = {978-88-6292-976-9},
  pages     = {156 -- 161},
  year      = {2018},
  language  = {en}
}
@article{PancContiuBocanetetal.2019,
  author    = {Panc, Nicolae and Contiu, Glad and Bocanet, Vlad and Thurn, Laura and Sabau, Emilia},
  title     = {The influence of cutting technology on surface wear hardness},
  series = {Academic Journal of Manufacturing Engineering},
  volume    = {17},
  journal   = {Academic Journal of Manufacturing Engineering},
  number    = {3},
  issn      = {1583-7904},
  pages     = {205 -- 210},
  year      = {2019},
  language  = {en}
}
@article{CosmaKesslerGebhardtetal.2020,
  author    = {Cosma, Cosmin and Kessler, Julia and Gebhardt, Andreas and Campbell, Ian and Balc, Nicolae},
  title     = {Improving the Mechanical Strength of Dental Applications and Lattice Structures SLM Processed},
  series = {Materials},
  volume    = {13},
  journal   = {Materials},
  number    = {4},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {1996-1944},
  doi       = {10.3390/ma13040905},
  pages     = {1 -- 18},
  year      = {2020},
  abstract  = {To manufacture custom medical parts or scaffolds with reduced defects and high mechanical characteristics, new research on optimizing the selective laser melting (SLM) parameters are needed. In this work, a biocompatible powder, 316L stainless steel, is characterized to understand the particle size, distribution, shape and flowability. Examination revealed that the 316L particles are smooth, nearly spherical, their mean diameter is 39.09 μm and just 10\% of them hold a diameter less than 21.18 μm. SLM parameters under consideration include laser power up to 200 W, 250-1500 mm/s scanning speed, 80 μm hatch spacing, 35 μm layer thickness and a preheated platform. The effect of these on processability is evaluated. More than 100 samples are SLM-manufactured with different process parameters. The tensile results show that is possible to raise the ultimate tensile strength up to 840 MPa, adapting the SLM parameters for a stable processability, avoiding the technological defects caused by residual stress. Correlating with other recent studies on SLM technology, the tensile strength is 20\% improved. To validate the SLM parameters and conditions established, complex bioengineering applications such as dental bridges and macro-porous grafts are SLM-processed, demonstrating the potential to manufacture medical products with increased mechanical resistance made of 316L.},
  language  = {en}
}
@inproceedings{UlmerBraunChengetal.2021,
  author    = {Ulmer, Jessica and Braun, Sebastian and Cheng, Chi-Tsun and Dowey, Steve and Wollert, J{\"o}rg},
  title     = {Adapting augmented reality systems to the users' needs using gamification and error solving methods},
  series = {Procedia CIRP - 54th CIRP CMS 2021 - Towards Digitalized Manufacturing 4.0},
  volume    = {104},
  booktitle = {Procedia CIRP - 54th CIRP CMS 2021 - Towards Digitalized Manufacturing 4.0},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {2212-8271},
  doi       = {10.1016/j.procir.2021.11.024},
  pages     = {140 -- 145},
  year      = {2021},
  abstract  = {Animations of virtual items in AR support systems are typically predefined and lack interactions with dynamic physical environments. AR applications rarely consider users' preferences and do not provide customized spontaneous support under unknown situations. This research focuses on developing adaptive, error-tolerant AR systems based on directed acyclic graphs and error resolving strategies. Using this approach, users will have more freedom of choice during AR supported work, which leads to more efficient workflows. Error correction methods based on CAD models and predefined process data create individual support possibilities. The framework is implemented in the Industry 4.0 model factory at FH Aachen.},
  language  = {en}
}
@inproceedings{WeissHeslenfeldSaeweetal.2022,
  author    = {Weiss, Christian and Heslenfeld, Jonas and Saewe, Jasmin Kathrin and Bremen, Sebastian and H{\"a}fner, Constantin Leon},
  title     = {Investigation on the influence of powder humidity in Laser Powder Bed Fusion (LPBF)},
  series = {Procedia CIRP 12th CIRP Conference on Photonic Technologies [LANE 2022]},
  volume    = {111},
  booktitle = {Procedia CIRP 12th CIRP Conference on Photonic Technologies [LANE 2022]},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {2212-8271},
  doi       = {10.1016/j.procir.2022.08.102},
  pages     = {115 -- 120},
  year      = {2022},
  abstract  = {In the Laser Powder Bed Fusion (LPBF) process, parts are built out of metal powder material by exposure of a laser beam. During handling operations of the powder material, several influencing factors can affect the properties of the powder material and therefore directly influence the processability during manufacturing. Contamination by moisture due to handling operations is one of the most critical aspects of powder quality. In order to investigate the influences of powder humidity on LPBF processing, four materials (AlSi10Mg, Ti6Al4V, 316L and IN718) are chosen for this study. The powder material is artificially humidified, subsequently characterized, manufactured into cubic samples in a miniaturized process chamber and analyzed for their relative density. The results indicate that the processability and reproducibility of parts made of AlSi10Mg and Ti6Al4V are susceptible to humidity, while IN718 and 316L are barely influenced.},
  language  = {en}
}
@article{AbbasBalcBremenetal.2022,
  author    = {Abbas, Karim and Balc, Nicolae and Bremen, Sebastian and Skupin, Marco},
  title     = {Crystallization and aging behavior of polyetheretherketone PEEK within rapid tooling and rubber molding},
  series = {Journal of Manufacturing and Materials Processing},
  volume    = {6},
  journal   = {Journal of Manufacturing and Materials Processing},
  number    = {5},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2504-4494},
  doi       = {10.3390/jmmp6050093},
  pages     = {1 -- 12},
  year      = {2022},
  abstract  = {In times of short product life cycles, additive manufacturing and rapid tooling are important methods to make tool development and manufacturing more efficient. High-performance polymers are the key to mold production for prototypes and small series. However, the high temperatures during vulcanization injection molding cause thermal aging and can impair service life. The extent to which the thermal stress over the entire process chain stresses the material and whether it leads to irreversible material aging is evaluated. To this end, a mold made of PEEK is fabricated using fused filament fabrication and examined for its potential application. The mold is heated to 200 ◦C, filled with rubber, and cured. A differential scanning calorimetry analysis of each process step illustrates the crystallization behavior and first indicates the material resistance. It shows distinct cold crystallization regions at a build chamber temperature of 90 ◦C. At an ambient temperature above Tg, crystallization of 30\% is achieved, and cold crystallization no longer occurs. Additional tensile tests show a decrease in tensile strength after ten days of thermal aging. The steady decrease in recrystallization temperature indicates degradation of the additives. However, the tensile tests reveal steady embrittlement of the material due to increasing crosslinking.},
  language  = {en}
}
@article{EngemannCoenenDawaretal.2021,
  author    = {Engemann, Heiko and C{\"o}nen, Patrick and Dawar, Harshal and Du, Shengzhi and Kallweit, Stephan},
  title     = {A robot-assisted large-scale inspection of wind turbine blades in manufacturing using an autonomous mobile manipulator},
  series = {Applied Sciences},
  volume    = {11},
  journal   = {Applied Sciences},
  number    = {19},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2076-3417},
  doi       = {10.3390/app11199271},
  pages     = {1 -- 22},
  year      = {2021},
  abstract  = {Wind energy represents the dominant share of renewable energies. The rotor blades of a wind turbine are typically made from composite material, which withstands high forces during rotation. The huge dimensions of the rotor blades complicate the inspection processes in manufacturing. The automation of inspection processes has a great potential to increase the overall productivity and to create a consistent reliable database for each individual rotor blade. The focus of this paper is set on the process of rotor blade inspection automation by utilizing an autonomous mobile manipulator. The main innovations include a novel path planning strategy for zone-based navigation, which enables an intuitive right-hand or left-hand driving behavior in a shared human-robot workspace. In addition, we introduce a new method for surface orthogonal motion planning in connection with large-scale structures. An overall execution strategy controls the navigation and manipulation processes of the long-running inspection task. The implemented concepts are evaluated in simulation and applied in a real-use case including the tip of a rotor blade form.},
  language  = {en}
}
@inproceedings{EvansBraunUlmeretal.2022,
  author    = {Evans, Benjamin and Braun, Sebastian and Ulmer, Jessica and Wollert, J{\"o}rg},
  title     = {AAS implementations - current problems and solutions},
  series = {20th International Conference on Mechatronics - Mechatronika (ME)},
  booktitle = {20th International Conference on Mechatronics - Mechatronika (ME)},
  publisher = {IEEE},
  address   = {New York, NY},
  isbn      = {978-1-6654-1040-3},
  doi       = {10.1109/ME54704.2022.9982933},
  pages     = {6 Seiten},
  year      = {2022},
  abstract  = {The fourth industrial revolution presents a multitude of challenges for industries, one of which being the increased flexibility required of manufacturing lines as a result of increased consumer demand for individualised products. One solution to tackle this challenge is the digital twin, more specifically the standardised model of a digital twin also known as the asset administration shell. The standardisation of an industry wide communications tool is a critical step in enabling inter-company operations. This paper discusses the current state of asset administration shells, the frameworks used to host them and their problems that need to be addressed. To tackle these issues, we propose an event-based server capable of drastically reducing response times between assets and asset administration shells and a multi-agent system used for the orchestration and deployment of the shells in the field.},
  language  = {en}
}
@article{KosterScheidweilerTieves2016,
  author    = {Koster, Arie and Scheidweiler, Robert and Tieves, Martin},
  title     = {A flow based pruning scheme for enumerative equitable coloring algorithms},
  series = {A flow based pruning scheme for enumerative equitable coloring algorithms},
  journal   = {A flow based pruning scheme for enumerative equitable coloring algorithms},
  doi       = {10.48550/arXiv.1607.08754},
  pages     = {1 -- 30},
  year      = {2016},
  abstract  = {An equitable graph coloring is a proper vertex coloring of a graph G where the sizes of the color classes differ by at most one. The equitable chromatic number is the smallest number k such that G admits such equitable k-coloring. We focus on enumerative algorithms for the computation of the equitable coloring number and propose a general scheme to derive pruning rules for them: We show how the extendability of a partial coloring into an equitable coloring can be modeled via network flows. Thus, we obtain pruning rules which can be checked via flow algorithms. Computational experiments show that the search tree of enumerative algorithms can be significantly reduced in size by these rules and, in most instances, such naive approach even yields a faster algorithm. Moreover, the stability, i.e., the number of solved instances within a given time limit, is greatly improved. Since the execution of flow algorithms at each node of a search tree is time consuming, we derive arithmetic pruning rules (generalized Hall-conditions) from the network model. Adding these rules to an enumerative algorithm yields an even larger runtime improvement.},
  language  = {en}
}
@article{BeckenbachScheidweiler2016,
  author    = {Beckenbach, Isabel and Scheidweiler, Robert},
  title     = {Perfect ƒ-Matchings and ƒ-Factors in Hypergraphs - A Combinatorial Approach},
  series = {Discrete Mathematics},
  volume    = {240},
  journal   = {Discrete Mathematics},
  number    = {10},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {2192-7782},
  doi       = {10.1016/j.disc.2017.05.005},
  pages     = {2499 -- 2506},
  year      = {2016},
  abstract  = {We prove characterizations of the existence of perfect ƒ-matchings in uniform mengerian and perfect hypergraphs. Moreover, we investigate the ƒ-factor problem in balanced hypergraphs. For uniform balanced hypergraphs we prove two existence theorems with purely combinatorial arguments, whereas for non-uniform balanced hypergraphs we show that the ƒ-factor problem is NP-hard.},
  language  = {en}
}
@article{ScheidweilerTriesch2016,
  author    = {Scheidweiler, Robert and Triesch, Eberhard},
  title     = {A note on the duality between matchings and vertex covers in balanced hypergraphs},
  series = {Journal of Combinatorial Optimization},
  volume    = {32},
  journal   = {Journal of Combinatorial Optimization},
  number    = {2},
  publisher = {Springer},
  address   = {Berlin},
  issn      = {1573-2886},
  doi       = {10.1007/s10878-015-9887-5},
  pages     = {639 -- 644},
  year      = {2016},
  abstract  = {We present a new Min-Max theorem for an optimization problem closely connected to matchings and vertex covers in balanced hypergraphs. The result generalizes Kőnig's Theorem (Berge and Las Vergnas in Ann N Y Acad Sci 175:32-40, 1970; Fulkerson et al. in Math Progr Study 1:120-132, 1974) and Hall's Theorem (Conforti et al. in Combinatorica 16:325-329, 1996) for balanced hypergraphs.},
  language  = {en}
}
@article{KilicRaatschenKoerfgenetal.2017,
  author    = {Kilic, S. A. and Raatschen, Hans-J{\"u}rgen and K{\"o}rfgen, B. and Apaydin, N. M. and Astaneh-Asl, A.},
  title     = {FE Model of the Fatih Sultan Mehmet Suspension Bridge Using Thin Shell Finite Elements},
  series = {Arabian Journal for Science and Engineering},
  volume    = {42},
  journal   = {Arabian Journal for Science and Engineering},
  number    = {3},
  publisher = {Springer Nature},
  issn      = {2191-4281},
  doi       = {10.1007/s13369-016-2316-y},
  pages     = {1103 -- 1116},
  year      = {2017},
  abstract  = {This paper presents the results of an eigenvalue analysis of the Fatih Sultan Mehmet Bridge. A high-resolution finite element model was created directly from the available design documents. All physical properties of the structural components were included in detail, so no calibration to the measured data was necessary. The deck and towers were modeled with shell elements. A nonlinear static analysis was performed before the eigenvalue calculation. The calculated natural frequencies and corresponding mode shapes showed good agreement with the available measured ambient vibration data. The calculation of the effective modal mass showed that nine modes had single contributions higher than 5 \% of the total mass. They were in a frequency range up to 1.2 Hz. The comparison of the results for the torsional modes especially demonstrated the advantage of using thin shell finite elements over the beam modeling approach.},
  language  = {en}
}
@inproceedings{EngemannWiesenKallweitetal.2018,
  author    = {Engemann, Heiko and Wiesen, Patrick and Kallweit, Stephan and Deshpande, Harshavardhan and Schleupen, Josef},
  title     = {Autonomous mobile manipulation using ROS},
  series = {Advances in Service and Industrial Robotics},
  booktitle = {Advances in Service and Industrial Robotics},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-319-61276-8},
  doi       = {10.1007/978-3-319-61276-8_43},
  pages     = {389 -- 401},
  year      = {2018},
  language  = {en}
}
@inproceedings{PfaffSchmidtEnning2017,
  author    = {Pfaff, Raphael and Schmidt, B. D. and Enning, Manfred},
  title     = {Towards inclusion of the freight rail system in the industrial internet of things - Wagon 4.0},
  series = {Stephenson Conference, London, March 2017},
  booktitle = {Stephenson Conference, London, March 2017},
  pages     = {1 -- 10},
  year      = {2017},
  language  = {en}
}
@inproceedings{PfaffMoshiriReichetal.2017,
  author    = {Pfaff, Raphael and Moshiri, Amir and Reich, Alexander and G{\"a}bel, Markus},
  title     = {Modelling of the effect of sanding on the wheel-rail adhesion area},
  series = {First International Conference on Rail Transportation},
  booktitle = {First International Conference on Rail Transportation},
  pages     = {1 -- 7},
  year      = {2017},
  language  = {en}
}
@inproceedings{ShahidiPfaffEnning2017,
  author    = {Shahidi, Parham and Pfaff, Raphael and Enning, Manfred},
  title     = {The connected wagon - a concept for the integration of vehicle side sensors and actors with cyber physical representation for condition based maintenance},
  series = {First International Conference on Rail Transportation},
  booktitle = {First International Conference on Rail Transportation},
  pages     = {1 -- 8},
  year      = {2017},
  language  = {en}
}
@inproceedings{PfaffShahidiEnning2017,
  author    = {Pfaff, Raphael and Shahidi, Parham and Enning, Manfred},
  title     = {Connected freight rail rolling stock: a modular approach integrating sensors, actors and cyber physical systems for operational advantages and condition based maintenance},
  series = {Asia-Pacific Conference of the Prognostics and Health Management Society},
  booktitle = {Asia-Pacific Conference of the Prognostics and Health Management Society},
  pages     = {1 -- 7},
  year      = {2017},
  language  = {en}
}
@inproceedings{Pfaff2017,
  author    = {Pfaff, Raphael},
  title     = {Analysis of Big Data Streams to obtain Braking Reliability Information for Train Protection systems},
  series = {Asia-Pacific Conference of the Prognostics and Health Management Society},
  booktitle = {Asia-Pacific Conference of the Prognostics and Health Management Society},
  pages     = {1 -- 7},
  year      = {2017},
  language  = {en}
}
@inproceedings{FateriGebhardtRenftle2015,
  author    = {Fateri, Miranda and Gebhardt, Andreas and Renftle, Georg},
  title     = {Additive manufacturing of drainage segments for cooling system of crucible melting furnaces},
  series = {Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials II, International Symposium on Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials, ICACC 15, 39th International Conference on Advanced Ceramics and Composites, Daytona Beach, FL, US, Jan 25-30, 2015},
  booktitle = {Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials II, International Symposium on Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials, ICACC 15, 39th International Conference on Advanced Ceramics and Composites, Daytona Beach, FL, US, Jan 25-30, 2015},
  publisher = {Wiley},
  address   = {Hoboken},
  issn      = {0196-6219},
  doi       = {10.1002/9781119211662.ch14},
  pages     = {123 -- 131},
  year      = {2015},
  language  = {en}
}
@inproceedings{UlmerBraunLaietal.2019,
  author    = {Ulmer, Jessica and Braun, Sebastian and Lai, Chow Yin and Cheng, Chi-Tsun and Wollert, J{\"o}rg},
  title     = {Generic integration of VR and AR in product lifecycles based on CAD models},
  series = {Proceedings of The 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  booktitle = {Proceedings of The 23rd World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2019},
  year      = {2019},
  language  = {en}
}
@inproceedings{EngemannBadriWenningetal.2019,
  author    = {Engemann, Heiko and Badri, Sriram and Wenning, Marius and Kallweit, Stephan},
  title     = {Implementation of an Autonomous Tool Trolley in a Production Line},
  series = {Advances in Service and Industrial Robotics. RAAD 2019. Advances in Intelligent Systems and Computing, vol 980},
  booktitle = {Advances in Service and Industrial Robotics. RAAD 2019. Advances in Intelligent Systems and Computing, vol 980},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-19648-6},
  doi       = {10.1007/978-3-030-19648-6_14},
  pages     = {117 -- 125},
  year      = {2019},
  language  = {en}
}
@article{SchwarzGebhardtSchleseretal.2019,
  author    = {Schwarz, Alexander and Gebhardt, Andreas and Schleser, Markus and Popoola, Patricia},
  title     = {New Welding Joint Geometries Manufactured by Powder Bed Fusion from 316L},
  series = {Materials Performance and Characterization 8},
  journal   = {Materials Performance and Characterization 8},
  number    = {in press},
  issn      = {2379-1365},
  doi       = {10.1520/MPC20180096},
  year      = {2019},
  language  = {en}
}