TY - JOUR A1 - Heinrichs, Horst A1 - Weck, H. T1 - Efficient finite-element structural analysis by interactive graphic mesh generation JF - CIRP Annals. 30 (1981), H. 1 Y1 - 1981 SP - 279 EP - 284 ER - TY - JOUR A1 - Haselgruber, Nikolaus A1 - Mautner, Karin A1 - Thiele, Jan T1 - Usage Space Analysis for Reliability Testing JF - Quality and Reliability Engineering International N2 - During the development process of a complex technical product, one widely used and important technique is accelerated testing where the applied stress on a component is chosen to exceed the reference stress, i.e. the stress encountered in field operation, in order to reduce the time to failure. For that, the reference stress has to be known. Since a complex technical product may fail regarding numerous failure modes, stress in general is highly dimensional rather than scalar. In addition, customers use their products individually, i.e. field operation should be described by a distribution rather than by one scalar stress value. In this paper, a way to span the customer usage space is shown. It allows the identification of worst case reference stress profiles in significantly reduced dimensions with minimal loss of information. The application example shows that even for a complex product like a combustion engine, stress information can be compressed significantly. With low measurement effort it turned out that only three reference stress cycles were sufficient to cover a broad range of customer stress variety. Y1 - 2010 U6 - https://doi.org/10.1002/qre.1155 SN - 1099-1638 N1 - Special Issue: Business and Industrial Statistics: Developments and Industrial Practices in Quality and Reliability VL - 26 IS - 8 SP - 877 EP - 885 PB - Wiley CY - New York ER - TY - JOUR A1 - Hanrath, Wilhelm A1 - Plesken, Wilhelm T1 - Group rings and irreducible representations of space groups / by W. Hanrath and W. Plesken JF - Journal für die reine und angewandte Mathematik. 362 (1985) Y1 - 1985 SN - 0075-4102 SP - 130 EP - 140 ER - TY - JOUR A1 - Hanrath, Wilhelm A1 - Plesken, Wilhelm T1 - The lattices of six-dimensional euclidean space JF - Mathematics of computation. 43 (1984), H. 168 Y1 - 1984 SN - 0025-5718 SP - 573 EP - 587 ER - TY - JOUR A1 - Hanrath, Wilhelm T1 - Character tables of some factor groups of space groups JF - Perfect groups / Derek F. Holt and W. Plesken Y1 - 1989 SN - 0-19-853559-7 SP - 357 EP - 359 PB - Clarendon Press CY - Oxford ER - TY - JOUR A1 - Haag, S. A1 - Zontar, D. A1 - Schleupen, Josef A1 - Müller, T. A1 - Brecher, C. T1 - Chain of refined perception in self-optimizing assembly of micro-optical systems JF - Journal of sensors and sensor systems N2 - 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. Y1 - 2014 U6 - https://doi.org/10.5194/jsss-3-87-2014 SN - 2194-878X VL - 3 IS - 1 SP - 87 EP - 95 PB - Copernicus Publ. CY - Göttingen ER - TY - JOUR A1 - Grundmann, Reinhard T1 - Design Criteria for Aeroacoustic Wind Tunnels Y1 - 1992 N1 - Konferenzeinzelbericht : DGLR-workshop : Joint meeting of the Specialists Groups Test Facilities/Aeroacoustics - Flight Noise . Deutsche Gesellschaft für Luft- und Raumfahrt. Test Facilities Specialist Group ; Deutsche Gesellschaft für Luft- und Raumfahr ER - TY - JOUR A1 - Glowania, Michael A1 - Gries, Thomas A1 - Schoene, Jens A1 - Schleser, Markus A1 - Reisgen, Uwe T1 - Innovative coating technology for textile reinforcements of concrete applications JF - 13th International Congress on Polymers in Concrete : 10 - 12 February 2010, Funchal, Madeira, Portugal.(Key engineering materials. Vol. 466) Y1 - 2011 SN - 978-3-03785-008-4 SN - 1013-9826 (E-Journal) ; 0252-1059 (Print) SP - 167 EP - 173 PB - Trans Tech Publications CY - Bäch ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Schmidt, Frank-Michael A1 - Hötter, Jan-Steffen A1 - Sokalla, Wolfgang A1 - Sokalla, Patrick T1 - Additive Manufacturing by selective laser melting the realizer desktop machine and its application for the dental industry JF - Physics Procedia Y1 - 2010 SN - 1875-3892 N1 - Laser Assisted Net Shape Engineering 6, Proceedings of the LANE 2010, Part 2 VL - 5 IS - 2 SP - 543 EP - 549 ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Schmidt, Frank-Michael T1 - Practical experiences with making and finishing of coloured models using 3D printing Y1 - 2002 N1 - International Conference on Rapid Prototyping and Manufacturing <2, 2002, Beijing> ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Fateri, Miranda T1 - 3D printing and its applications JF - RTejournal - Forum für Rapid Technologie N2 - Eine zunehmende Anzahl von Artikeln in Publikumszeitschriften und Journalen rückt die direkte Herstellung von Bauteilen und Figuren immer mehr in das Bewusstsein einer breiten Öffentlichkeit. Leider ergibt sich nur selten ein einigermaßen vollständiges Bild davon, wie und in welchen Lebensbereichen diese Techniken unseren Alltag verändern werden. Das liegt auch daran, dass die meisten Artikel sehr technisch geprägt sind und sich nur punktuell auf Beispiele stützen. Dieser Beitrag geht von den Bedürfnissen der Menschen aus, wie sie z.B. in der Maslow’schen Bedürfnispyramide strukturiert dargestellt sind und unterstreicht dadurch, dass 3D Printing (oder Additive Manufacturing resp. Rapid Prototyping) bereits alle Lebensbereiche erfasst hat und im Begriff ist, viele davon zu revolutionieren. N2 - An increasing amount of popular articles focus on making models and sculptures by 3D Printing thus making more and more even private users aware of this technology. Unfortunately they mostly draw an incomplete picture of how our daily life will be influenced by this new technology. Often this is caused by a very technical point of view based on not very representative examples. This article focuses on the peoples needs as they have been structured by the so-called Maslow pyramid. Doing so, it underlines that 3D Printing (called Additive Manufacturing or Rapid Prototyping as well) already touches all aspects of life and is about to revolutionize most of them. Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0009-2-35626 SN - 1614-0923 VL - 10 IS - 1 PB - Fachhochschule Aachen CY - Aachen ER - TY - JOUR A1 - Gebhardt, Andreas T1 - Rapid Prototyping and PIV Y1 - 2001 N1 - Workshop on Industrial Applications of Particle Image Velocimetry <2001, Köln> ER - TY - JOUR A1 - Gebhardt, Andreas T1 - Laserwelding with fillerwire JF - LIA handbook of laser material processing / Laser Institute of America Y1 - 2001 SN - 3-540-41770-2 N1 - Chapter 11.2.12 CY - Orlando, Florida ER - TY - JOUR A1 - Gebhardt, Andreas T1 - Generative Manufacturing of Ceramic Parts "Vision Rapid Prototyping" N2 - Table of Contents Introduction 1. Generative Manufacturing Processes 2. Classification of Generative Manufacturing Processes 3. Application of Generative Processes on the Fabrication of Ceramic Parts 3.1 Extrusion 3.2 3D-Printing 3.3 Sintering – Laser Sintering 3.4 Layer-Laminate Processes 3.5 Stereolithography (sometimes written: Stereo Lithography) 4. Layer Milling 5. Conclusion - Vision KW - Rapid prototyping KW - Rapid Technologie KW - Rapid Prototyping Y1 - 2006 ER - TY - JOUR A1 - Gebhardt, Andreas T1 - Rapid Prototyping JF - Landolt-Börnstein - Group VIII Advanced Materials and Technologies‡Vol. 1 Laser Physics and Applications‡Subvol. C Laser Applications / authors: Bäuerle, D. ... Y1 - 2004 SN - 3-540-00105-0 SP - 105 EP - 123 PB - Heidelberg CY - Springer ER - TY - JOUR A1 - Frohberg, Martin G. A1 - Anik, Sabri T1 - Thermodynamic relations between component activities and gas solubilities in binary metallic systems JF - Berichte der Bunsengesellschaft für physikalische Chemie Y1 - 1985 SN - 0940-483X SN - 0005-9021 VL - 89 IS - 2 SP - 130 EP - 134 ER - TY - JOUR A1 - Frohberg, Martin G. A1 - Anik, Sabri T1 - The application of a quadi-chemical lattice model to binary metallic solvents containing oxygen in higher concentrations JF - Zeitschrift für Metallkunde Y1 - 1983 SN - 0044-3093 VL - 74 IS - 10 SP - 665 EP - 666 ER - TY - JOUR A1 - Frohberg, Martin G. A1 - Anik, Sabri T1 - The calculation of component activities of binary metallic melts from their gas solubilities JF - Zeitschrift für Metallkunde Y1 - 1985 SN - 0044-3093 VL - 76 IS - 2 SP - 135 EP - 137 ER - TY - JOUR A1 - Franzen, Julius A1 - Pinders, Erik A1 - Pfaff, Raphael A1 - Enning, Manfred T1 - RailCrowd’s virtual fleets: Make most of your asset data JF - Deine Bahn N2 - 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. Y1 - 2018 SN - 0948-7263 IS - 9 SP - 11 EP - 13 PB - Bahn-Fachverlag CY - Berlin ER - TY - JOUR A1 - Franko, Josef A1 - Du, Shengzhi A1 - Kallweit, Stephan A1 - Duelberg, Enno Sebastian A1 - Engemann, Heiko T1 - Design of a Multi-Robot System for Wind Turbine Maintenance JF - Energies N2 - The maintenance of wind turbines is of growing importance considering the transition to renewable energy. This paper presents a multi-robot-approach for automated wind turbine maintenance including a novel climbing robot. Currently, wind turbine maintenance remains a manual task, which is monotonous, dangerous, and also physically demanding due to the large scale of wind turbines. Technical climbers are required to work at significant heights, even in bad weather conditions. Furthermore, a skilled labor force with sufficient knowledge in repairing fiber composite material is rare. Autonomous mobile systems enable the digitization of the maintenance process. They can be designed for weather-independent operations. This work contributes to the development and experimental validation of a maintenance system consisting of multiple robotic platforms for a variety of tasks, such as wind turbine tower and rotor blade service. In this work, multicopters with vision and LiDAR sensors for global inspection are used to guide slower climbing robots. Light-weight magnetic climbers with surface contact were used to analyze structure parts with non-destructive inspection methods and to locally repair smaller defects. Localization was enabled by adapting odometry for conical-shaped surfaces considering additional navigation sensors. Magnets were suitable for steel towers to clamp onto the surface. A friction-based climbing ring robot (SMART— Scanning, Monitoring, Analyzing, Repair and Transportation) completed the set-up for higher payload. The maintenance period could be extended by using weather-proofed maintenance robots. The multi-robot-system was running the Robot Operating System (ROS). Additionally, first steps towards machine learning would enable maintenance staff to use pattern classification for fault diagnosis in order to operate safely from the ground in the future. Y1 - 2020 U6 - https://doi.org/10.3390/en13102552 SN - 1996-1073 VL - 13 IS - 10 SP - Article 2552 PB - MDPI CY - Basel ER -