TY - JOUR A1 - Enning, Manfred A1 - Hücker, Jan A1 - Jenayeh, Imad A1 - Rake, Heinrich T1 - A Parametric Identification Scheme for a Self-tuning Industrial Compact Controller - INTERKAMA 1999 / Hucker, Jan ; Jenayeh, Imad ; Enning, Manfred ; Rake, Heinrich Y1 - 1999 N1 - ISA TP99UN139 ; Proceedings ISA-Tech Conference, Düsseldorf 1999 ER - TY - JOUR A1 - Enning, Manfred A1 - Kinoo, B. A1 - Krüger, M. A1 - Schloßer, A. T1 - Turbodiesel fährt umweltfreundlich ins nächste Jahrtausend. Neue Regelungs- und Steuerungsverfahren verbessern Fahrdynamik und Emissionsverhalten / Enning, M. ; Kinoo, B. ; Krüger, M. ; Schloßer, A. JF - RWTH-Themen. 1999 (1999), H. 2 Y1 - 1999 N1 - RWTH-Themen 2/1999: Automobiltechnik SP - 86 EP - 91 ER - TY - JOUR A1 - Enning, Manfred A1 - Kositza, N. A1 - Rake, H. T1 - Modellbildung und Analyse von Schwingungsphänomenen an Kettenkratzförderern / Kositza, N. ; Enning, M. ; Rake, H. JF - Automatisierungstechnik im Spannungsfeld neuer Technologien : Tagung Baden-Baden, 22. und 23. Mai 2001 / VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik Y1 - 2001 SN - 3-18-091608-7 N1 - GMA-Kongress ; 2001 SP - 577 EP - 584 PB - VDI-Verl. CY - Düsseldorf ER - TY - JOUR A1 - Enning, Manfred A1 - Zambou, Nathan A1 - Abel, Dirk T1 - Nonlinear spacing control of following vehicles within platoon a controlled lagrangian approach / Zambou, Nathan ; Enning, Manfred ; Abel, Dirk JF - NOLCOS, IFAC Symposium on Nonlinear Control Systems Y1 - 2004 N1 - NOLCOS, 2004, IFAC Symposium on Nonlinear Control Systems, 6th, Stuttgart, DE, 2004-09-01 - 2004-09-03 SP - 1211 EP - 1216 ER - TY - JOUR A1 - Enning, Manfred A1 - Stützle, Thorsten A1 - Viereck, Uwe A1 - Stribersky, Anton T1 - Adaptiver Gleitschutz für Schienenfahrzeuge (Adaptive Wheelslide Protection System for Railway Vehicles) / Stützle, Thorsten ; Viereck, Uwe ; Enning, Manfred ; Stribersky, Anton ; Rulka, Wolfgang JF - at - Automatisierungstechnik . 54 (2006), H. 3 Y1 - 2006 SN - 0178-2312 SP - 139 EP - 148 ER - TY - JOUR A1 - Enning, Manfred T1 - FlexCargoRail – Ohne Diesel in die Letzte Meile JF - Schienenverkehr – sicher, leise, effizient : InnoTrans, Berlin 2008 / Hrsg.: Bundesministerium für Wirtschaft und Technologie, Referat Öffentlichkeitsarbeit Y1 - 2008 N1 - Innovationspolitik, Informationsgesellschaft, Telekommunikation SP - 49 EP - 52 CY - Berlin ER - TY - JOUR A1 - Enning, Manfred A1 - Stützle, T. A1 - Viereck, U. T1 - Adaptiver Gleitschutz für Schienenfahrzeuge / Stützle, T. ; Viereck, U. ; Enning, M. ; Rulka, W. ; Stribersky, A. ; Abel, D. JF - Innovations for Europe : VDE-Kongress 2006, 23. - 25. Oktober 2006 in Aachen / Tagungsleiter: W. Schröppel Y1 - 2006 SN - 3-8007-2979-2 SP - 401 EP - 406 PB - VDE-Verl. CY - Berlin ER - TY - JOUR A1 - Enning, Manfred T1 - Einzelwagenkonzept für die letzte Meile : „FlexCargoRail“ sieht autarke Fahrten von Waggons mit Rangiergeschwindigkeit vor. Massive Effizienzgewinne locken JF - Deutsche Verkehrs-Zeitung : DVZ / Logistik auf der Schiene (2008) Y1 - 2008 SN - 0342-166X N1 - vom 8.11.2008 ER - TY - JOUR A1 - Enning, Manfred T1 - Flexcargorail - ein Fahrzeugsystem für effizienten Einzelwagenverkehr / Baier, Martin ; Enning, Manfred JF - Logistik Management. 8 (2006), H. 3 Y1 - 2006 SN - 1436-6231 SP - 28 EP - 42 ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Ahmed, Essam T1 - Uni- and bi-axial deformation behavior of laser welded advanced high strength steel sheets JF - Journal of materials processing technology N2 - Bead-on-plate butt joints of 2.5 mm hot rolled DP600/DP600 and 1.2 mm cold rolled TRIP700/TRIP700 steel sheets were performed using 6 kW CO2 laser beam welding. The welding speed ranged from 1.5 to 3.0 and from 2.1 to 3.9 m/min in DP/DP and TRIP/TRIP steel weldments respectively. A top surface helium gas was used as a shielding gas at a flow rate of 20 l/min. Metallographic examinations and transverse tensile testing (DIN EN 895: 1995) were carried out to characterize the weldments. The formability of base metals and weldments were investigated by standard Erichsen test (DIN EN ISO 20482). It was found that the uniaxial plastic behavior of both DP600 and TRIP700 base metals was in agreement with Swift and modified Mecking–Kocks models respectively. In a perpendicular tensile test to the weld line, all specimens were fractured at the base metal however the strengths were somewhat higher than those of base metal. There was a significant reduction in formability caused by welding of both DP/DP and TRIP/TRIP steel weldments and the formability has been improved with the increase of the welding speed. Y1 - 2010 U6 - https://doi.org/http10.1016/j.jmatprotec.2010.08.003 SN - 0924-0136 VL - 210 IS - 15 SP - 2188 EP - 2196 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Mukherjee, Krishnendu A1 - Prahl, Ulrich A1 - Bleck, Wolfgang A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Abdurakhmanov, Aydemir T1 - Characterization and modelling techniques for gas metal arc welding of DP 600 sheet steels JF - Materialwissenschaft und Werkstofftechnik N2 - The objectives of the present work are to characterize the Gas Metal Arc Welding process of DP 600 sheet steel and to summarize the modelling techniques. The time-temperature evolution during the welding cycle was measured experimentally and modelled with the softwaretool SimWeld. To model the phase transformations during the welding cycle dilatometer tests were done to quantify the parameters for phase field modelling by MICRESS®. The important input parameters are interface mobility, nucleation density, etc. A contribution was made to include austenite to bainite transformation in MICRESS®. This is useful to predict the microstructure in the fast cooling segments. The phase transformation model is capable to predict the microstructure along the heating and cooling cycles of welding. Tensile tests have shown the evidence of failure at the heat affected zone, which has the ferrite-tempered martensite microstructure. Y1 - 2010 U6 - https://doi.org/10.1002/mawe.201000692 SN - 1521-4052 VL - 41 IS - 11 SP - 972 EP - 983 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Jerabek, Jakub A1 - Chudoba, Rostislav T1 - Messung der Strahlqualität einer Elektronenstrahlanlage in Umgebungsatmosphäre JF - Materialwissenschaft und Werkstofftechnik N2 - In den letzten Jahrzehnten hat das Elektronenstrahlschweißen, das bereits im größeren Maßstab verwendet wird, seine Fähigkeit als qualitatives Werkzeug für die Verbindung verschiedener Materialen nachgewiesen. Das Non Vacuum Electron Beam Welding (NV-EBW) hat zahlreiche Vorteile im Vergleich zum Elektronenstrahlschweißen im Vakuum, da man unter normalem Atmosphärendruck arbeiten kann. Im Hinblick auf die reproduzierbare Qualität, insbesondere im Bereich der Massen-Fertigung, ist die Kontrolle der Strahlparameter sowie deren Einfluss auf das Schweißergebnis von großer Bedeutung. Durch eine genaue Kenntnis der Strahlkenngrößen wie des Strahldurchmessers und der Leistungsdichteverteilung kann eine Aussage über die sich ausbildende Schweißnaht sowie die Schweißbaddynamik getroffen werden. Messungen der Strahlkenngrößen im Prozess erlauben insbesondere die Untersuchung von Humping-Effekten. In diesem Beitrag wird der Prozess der Elektronenstrahlvermessung unter atmosphärischen Bedingungen beschrieben. Es wird zudem die Abhängigkeit der Elektronenstrahlcharakteristika von den verschiedenen Prozessparametern dargestellt. Y1 - 2010 SN - 1521-4052 VL - 41 IS - 1 SP - 45 EP - 52 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Ahmed, Essam A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg T1 - On formability of tailor laser welded blanks of DP/TRIP steel sheets JF - Science and technology of welding and joining N2 - This paper aims to evaluate the formability of tailor welded blanks of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets. In this work, bead on plate butt joints of 2·5 mm DP600 and 1·2 mm TRIP700 steel sheets were performed using CO2 laser beam welding. Microhardness measurements and transverse tensile testing were carried out to characterise the welds. The formability of base metals and welds were investigated by standard Erichsen test. In a perpendicular tensile test to the weld line, all specimens were fractured at the TRIP base metal, and the strengths were somewhat higher than those of base metal. There was a significant reduction in formability caused by welding of the DP600/TRIP700 steel sheets, and the formability increased with increasing welding speed. Y1 - 2010 U6 - https://doi.org/10.1179/136217110X12731414739754 SN - 1743-2936 VL - 15 IS - 5 SP - 337 EP - 342 PB - Maney CY - Leeds ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Ahmed, Essam T1 - Shielding gas influences on laser weldability of tailored blanks of advanced automotive steels JF - Applied surface science N2 - The effects of shielding gas types and flow rates on CO2 laser weldability of DP600/TRIP700 steel sheets were studied in this work. The evaluated shielding gases were helium (He), argon (Ar) and different mixtures of He and Ar. Weld penetration, tensile strength and formability (Erichsen test) of laser welds were found to be strongly dependent upon the shielding gas types. The ability of shielding gas in removing plasma plume and thus increasing weld penetration is believed to be closely related to ionization potential and atomic weight which determine the period of plasma formation and disappearance. It was found that the higher helium shielding gas flow rate, the deeper weld penetration and the lower weld width. Y1 - 2010 U6 - https://doi.org/10.1016/j.apsusc.2010.08.042 SN - 0169-4332 (E-Journal); 0169-4332 (Print) VL - 257 IS - 5 SP - 1401 EP - 1406 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Mukherjee, Krishnendu A1 - Ramazani, Ali A1 - Yang, Li A1 - Prahl, Ulrich A1 - Bleck, Wolfgang A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Abdurakhmanov, Aydemir T1 - Characterization of gas metal arc welded hot rolled DP600 steel JF - Steel research international Y1 - 2011 SN - 1869-344X (E-Book); 1611-3683 (Print) VL - Vol. 82 IS - Iss. 12 SP - 1408 EP - 1416 PB - Wiley CY - Weinheim 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 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Ahmed, Essam T1 - Numerical and experimental investigation of tensile behavior of laser beam welded TRIP700 steel JF - ISIJ international Y1 - 2011 SN - 1347-5460 (E-Journal); 0915-1559 (Print) VL - Vol. 51 IS - No. 3 SP - 429 EP - 434 PB - ISIJ CY - Tōkyō ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Harms, Alexander A1 - Schiebahn, Alexander A1 - Naumov, Andreas T1 - Erweiterung des Parameterfelds zum Rührreibschweißen mittels konduktiver Unterstützung JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2011 SN - 0036-7184 VL - Bd. 63 IS - H. 12 SP - 710 EP - 714 PB - DVS-Media GmbH CY - Düsseldorf ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Harms, Alexander A1 - Schiebahn, Alexander A1 - Thiele, Regina ED - Kampker, Achim T1 - Elektromobilität - Herausforderungen an die Fügetechnik JF - mobilität morgen - Magazin zu Mobilität und Elektromobilität Y1 - 2011 VL - Jg. 1 IS - Nr. 2 SP - 16 EP - 17 ER - TY - JOUR A1 - Roesner, Andreas A1 - Scheik, Sven A1 - Olowinsky, Alexander A1 - Gillner, Arnold A1 - Propawe, Reinhart A1 - Schleser, Markus A1 - Reisgen, Uwe T1 - Innovative approach of joining hybrid components JF - Journal of laser applications Y1 - 2011 SN - 1042-346X VL - Vol. 23 IS - Iss. 3 SP - 32007 PB - Laser Institute of America CY - Orlando, Fla. ER - TY - JOUR A1 - Schleser, Markus A1 - Walk-Lauffer, Bernd A1 - Raupach, Michael A1 - Dilthey, Ulrich T1 - Application of polymers for textile-reinforced concrete JF - Journal of materials in civil engineering : properties, applications, durability Y1 - 2006 SN - 0899-1561 VL - 18 IS - 5 SP - 670 EP - 676 ER - TY - JOUR A1 - Feldmann, Markus A1 - Pak, Daniel A1 - Geßler, Achim A1 - Dilthey, Ulrich A1 - Schleser, Markus T1 - Bonded connections for textile reinforced concrete structures JF - Cailiao-gongcheng = Journal of materials engineering Y1 - 2006 SN - 1001-4381 IS - Special iss. SP - 123 EP - 127 ER - TY - JOUR A1 - Dilthey, Ulrich A1 - Schleser, Markus A1 - Hanisch, Vera A1 - Gries, Thomas T1 - Garnzugprüfung polymergetränkter Textilien für die Bewehrung von Beton JF - Technische Textilien Y1 - 2006 SN - 0323-3243 VL - 49 IS - 1 SP - 48 EP - 50 ER - TY - JOUR A1 - Feldmann, Markus A1 - Pak, Daniel A1 - Geßler, Achim A1 - Schleser, Markus T1 - Entwicklung eines Bemessungsmodells für punktförmige Verbindungen textibewehrter Betonbauteile JF - Bautechnik : Zeitschrift für den gesamten Ingenieurbau Y1 - 2008 SN - 0005-6820, 0341-1052, 0932-6359, 0932-8351, 0932-8351 N1 - Printausg. in der Bibliothek der FH Aachen vorhanden: 13 Z 177 VL - Bd. 85 IS - 2 SP - 143 EP - 147 ER - TY - JOUR A1 - Dilthey, Ulrich A1 - Schleser, Markus A1 - Feldmann, Martin A1 - Pak, Daniel A1 - Geßler, Achim T1 - Investigation of punctiform, plane and hybrid joints of textile-reinforced concrete parts JF - Cement and concrete composites Y1 - 2008 SN - 0958-9465 VL - Vol. 30 IS - iss. 2 SP - 82 EP - 87 ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Feldmann, Martin A1 - Pak, Daniel A1 - Geßler, Achim T1 - Kleben dünnwandiger Bauteile aus textilbewehrtem Beton JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2008 SN - 0036-7184 VL - Bd. 60 IS - H. 7/8 SP - 408 EP - 412 ER - TY - JOUR A1 - Dilthey, Ulrich A1 - Brandenburg, Annette A1 - Schleser, Markus T1 - Dispensing and application of unfilled adhesives in the micro range JF - Welding and cutting. 3 (2004), H. 4 Y1 - 2004 SN - 1612-3433 SP - 250 EP - 254 ER - TY - JOUR A1 - Sedlacek, G. A1 - Schätzke, C. A1 - Geßler, M. A1 - Schleser, Markus T1 - Fügen von Bauteilen aus textilbewehrtem Beton JF - Der Bauingenieur : die richtungsweisende Zeitschrift im Bauingenieurswesen ; offizielle Zeitschrift der VDI-Gesellschaft Bautechnik. Bd. 79 (2004), H. 12 Y1 - 2004 SN - 0005-6650 N1 - Printausg. in der Bibliothek der FH Aachen vorhanden: 13 Z 049-2004 SP - 569 EP - 575 ER - TY - JOUR A1 - Dilthey, Ulrich A1 - Schleser, Markus A1 - Geßler, Achim A1 - Rettweiler, Timo A1 - Völling, Boris T1 - Kleben textilbewehrter Betonbauteile JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren. Jg. 57 (2005), Nr. 8 Y1 - 2005 SN - 0036-7184 SP - 373 EP - 377 ER - TY - JOUR A1 - Roesner, Andreas A1 - Scheik, Sven A1 - Olowinsky, Alexander A1 - Gillner, Arnold A1 - Reisgen, Uwe A1 - Schleser, Markus T1 - Laser assisted joining of plastic metal hybrids JF - Lasers in manufacturing 2011 : proceedings of the sixth International WLT Conference on Lasers in Manufacturing, Munich, May 23 - 26 2011. (Physics procedia ; Vol. 12 (2011), Part B) Y1 - 2011 SN - 1875-3892 (E-Journal); 1875-3884 (Print) SP - 370 EP - 377 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Zabirov, Alexander T1 - Virtual welding equipment for simulation of GMAW processes with integration of power source regulation JF - Frontiers of materials science Y1 - 2011 SN - 2095-0268 (E-Journal); 2095-025X (Print) VL - Vol. 5 IS - Iss. 2 SP - 79 EP - 89 PB - Springer CY - Berlin ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Ahmed, Essam T1 - Statistical modeling of laser welding of DP/TRIP steel sheets JF - Optics and laser technology N2 - In this research work, a statistical analysis of the CO2 laser beam welding of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets was done using response surface methodology. The analysis considered the effect of laser power (2–2.2 kW), welding speed (40–50 mm/s) and focus position (−1 to 0 mm) on the heat input, the weld bead geometry, uniaxial tensile strength, formability limited dome height and welding operation cost. The experimental design was based on Box–Behnken design using linear and quadratic polynomial equations for predicting the mathematical models. The results indicate that the proposed models predict the responses adequately within the limits of welding parameters being used and the welding speed is the most significant parameter during the welding process. Y1 - 2012 U6 - https://doi.org/10.1016/j.optlastec.2011.05.025 SN - 1879-2545 (E-Journal); 0030-3992 (Print); 0308-4280 (Print) VL - 44 IS - 1 SP - 92 EP - 101 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Ahmed, Essam T1 - Optimization of laser welding of DP/TRIP steel sheets using statistical approach JF - Optics and laser technology N2 - Generally, the quality of a weld joint is directly influenced by the welding input parameter settings. Selection of proper process parameters is important to obtain the desired weld bead profile and quality. In this research work, numerical and graphical optimization techniques of the CO2 laser beam welding of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets were carried out using response surface methodology (RSM) based on Box–Behnken design. The procedure was established to improve the weld quality, increase the productivity and minimize the total operation cost by considering the welding parameters range of laser power (2–2.2 kW), welding speed (40–50 mm/s) and focus position (−1 to 0 mm). It was found that, RSM can be considered as a powerful tool in experimental welding optimization, even when the experimenter does not have a model for the process. Strong, efficient and low cost weld joints could be achieved using the optimum welding conditions. Y1 - 2012 U6 - https://doi.org/10.1016/j.optlastec.2011.06.028 SN - 1879-2545 (E-Journal); 0030-3992 (Print); 0308-4280 (Print) VL - 44 IS - 1 SP - 255 EP - 262 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Zabirov, Alexander A1 - Füssel, Uwe A1 - Schnick, Michael A1 - Hertel, Martin A1 - Jaeckel, Sebastian T1 - Modellierung und Visualisierung der MSG-Lichtbogenprozesse JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2012 SN - 0036-7184 VL - 64 IS - 4 SP - 166 EP - 174 PB - DVS Verlag CY - Düsseldorf ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Zabirov, Alexander A1 - Füssel, Uwe A1 - Schnick, Michael A1 - Hertel, Martin A1 - Jaeckel, Sebastian T1 - Modelling and visualisation of the GMA process JF - Welding and Cutting Y1 - 2012 SN - 1612-3433 VL - 11 IS - 4 SP - 242 EP - 249 PB - DVS Verlag CY - Düsseldorf ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Schiebahn, Alexander T1 - Untersuchung zum Einfluss von Maschineneigenschaften von Schweißzangen zum Widerstandspunktschweißen auf das Schweißergebnis JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2013 SN - 0036-7184 VL - Bd. 65 IS - H. 6 SP - 309 EP - 313 PB - DVS Verl. CY - Düsseldorf ER - TY - JOUR A1 - Ramazani, Ali A1 - Li, Yang A1 - Mukherjee, Krishnendu A1 - Prahl, Ulrich A1 - Bleck, Wolfgang A1 - Abdurakhmanov, Aydemir A1 - Schleser, Markus A1 - Reisgen, Uwe T1 - Microstructure evolution simulation in hot rolled DP600 steel during gas metal arc welding JF - Computational materials science Y1 - 2013 SN - 1879-0801 (E-Book); 0927-0256 (Print) VL - Vol. 68 SP - 107 EP - 116 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Hötter, Jan-Steffen A1 - Fateri, Miranda A1 - Gebhardt, Andreas T1 - Selective laser melting of metals: desktop machines open up new chances even for small companies JF - Advanced materials research N2 - Additive manufacturing (AM) of metal parts by using Selective Laser Melting (SLM) has become a powerful tool mostly in the area of automotive, aerospace engineering and others. Especially in the field of dentistry, jewelry and related branches that require individualized or even one-of-a-kind products, the direct digital manufacturing process opens up new ways of design and manufacturing. In these fields, mostly small and medium sized businesses (SME) are operating which do not have sufficient human and economic resources to invest in this technology. But to stay competitive, the application of AM can be regarded as a necessity. In this situation a new desktop machine (Realizer SLM 50) was introduced that cost about 1/3 of a shop floor SLM machine and promises small quality parts. To find out whether the machine really is an alternative for SMEs the University of Applied Science, Aachen, Germany, designed, build and optimized typical parts from the dentistry and the jewelry branches using CoCr and silver material, the latter being new with this application. The paper describes the SLM procedure and how to find and optimize the most important parameters. The test is accompanied by digital simulation in order to verify the build parameters and to plan future builds. The procedure is shown as well as the resulting parts made from CoCr and silver material. Y1 - 2012 U6 - https://doi.org/10.4028/www.scientific.net/AMR.622-623.461 SN - 1662-8985 (E-Journal); 1022-6680 (Print) VL - 622-623 SP - 461 EP - 465 PB - Trans Tech Publ. CY - Baech ER - TY - JOUR A1 - Starke, Günther A1 - Ahlbehrendt, Norbert A1 - Bischoff, Rainer A1 - Melzer, Harald A1 - Sieber, Sven A1 - Senk, Burkhard A1 - Kramarczyk, Peter T1 - RoboTOOL. Technologien für den ortsflexiblen Einsatz von Robotern bei temporären Arbeitsaufgaben in der Fertigung JF - wt Werkstattstechnik online Y1 - 2009 SN - 1436-4980 VL - Bd. 99 IS - H. 9 SP - 661 EP - 670 ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Fateri, Miranda T1 - 3D-Drucken und die Anwendungen JF - RTejournal - Forum für Rapid Technologie Y1 - 2014 SN - 1614-0923 VL - 11 (2014) IS - 1 SP - 1 EP - 9 ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Hötter, Jan-Steffen A1 - Ziebura, Dawid T1 - Impact of SLM build parameters on the surface quality JF - RTejournal - Forum für Rapid Technologien Y1 - 2014 SN - 1614-0923 VL - 11 (2014) IS - 1 SP - 1 EP - 14 ER - TY - JOUR A1 - Fateri, Miranda A1 - Gebhardt, Andreas T1 - Additive manufactured mechanical disentanglement lock JF - RTejournal - Forum für Rapid Technologie Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0009-2-42147 SN - 1614-0923 VL - 12 PB - Fachhochschule Aachen CY - Aachen ER - TY - JOUR A1 - Kessler, Julia A1 - Balc, Nicolae A1 - Gebhardt, Andreas A1 - Abbas, Karim T1 - Basic Research on Lattice Structures Focused on the Tensile Strength JF - Applied Mechanics and Materials Y1 - 2015 U6 - https://doi.org/10.4028/www.scientific.net/AMM.808.193 SN - 1662-7482 N1 - MTeM ; October 14-16, 2015, Cluj-Napoca, Romania VL - Vol. 808 SP - 193 EP - 198 PB - Trans Tech Publications CY - Bäch ER - TY - JOUR A1 - Fiedler, Gerda A1 - Henn, Gudrun A1 - Melcher, Karin T1 - ANPAK - ein semesterbegleitender Anpassungskurs JF - Zeitschrift für Hochschulentwicklung N2 - In Folge mehrjähriger statistischer Untersuchungen an der FH Aachen ist unter anderem ein Eingangstest entstanden, der als Diagnosetool für einen erfolgreichen Studieneinstieg verwendet wird. Es hat sich herausgestellt, dass ein Testergebnis von weniger als 25 (von maximal 56 erreichbaren) Punkten die Chance auf einen erfolgreichen Studieneinstieg deutlich verringert. Ungefähr die Hälfte aller Erstsemester hat weniger als 25 Punkte im Eingangstest. Weniger als 20 % dieser Gruppe bestehen innerhalb eines Jahres die Klausur Mathematik 1. Die investierte Zeit von zwei Semestern ist mit Blick auf den Wissenszuwachs und damit letztendlich den Studienerfolg nicht effizient genutzt. Deshalb haben wir im WS 2013/14 einen semesterbegleitenden Anpassungskurs für diese Gruppe installiert. Ziel eines solchen Kurses ist es, die Student/innen innerhalb eines Jahres in die Lage zu versetzen, nach zwei Semestern problemlos den Vorlesungen in Mathematik zu folgen. Dieser Artikel beschreibt das Konzept dieses Anpassungskurses und zeigt erste Ergebnisse und Probleme des Pilotdurchgangs auf. Y1 - 2014 SN - 2219-6994 VL - 9 IS - 4 SP - 85 EP - 100 PB - ÖGHD CY - Wien ER - TY - JOUR A1 - Fateri, Miranda A1 - Gebhardt, Andreas T1 - Selective Laser Melting of Soda-Lime Glass Powder JF - International Journal of Applied Ceramic Technology Y1 - 2015 U6 - https://doi.org/10.1111/ijac.12338 SN - 1744-7402 VL - 12 IS - 1 SP - 53 EP - 61 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Fateri, Miranda A1 - Gebhardt, Andreas T1 - Process Parameters Development of Selective Laser Melting of Lunar Regolith for On-Site Manufacturing Applications JF - International Journal of Applied Ceramic Technology Y1 - 2015 SN - 1744-7402 U6 - https://doi.org/10.1111/ijac.12326 VL - 12 IS - 1 SP - 46 EP - 52 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Thomas, Axel T1 - Generation Y JF - P.T. : Magazin für Wirtschaft und Gesellschaft Y1 - 2014 SN - 1860-501X VL - 10 IS - 3 SP - 6 EP - 9 PB - OPS Netzwerk CY - Leipzig ER - TY - JOUR A1 - Thomas, Axel A1 - Wassenberg, Gerd T1 - Erfolgreich sein im Kampf um die besten Talente : Employer Branding JF - Wirtschaftliche Nachrichten der Industrie- und Handelskammer Aachen Y1 - 2014 N1 - Nur noch nach Anfrage bei der IHK Aachen erhältlich: https://www.ihk.de/aachen/servicemarken/presse/medien-der-ihk/wirtschaftliche-nachrichten/aktuelle-ausgaben PB - IHK Aachen CY - Aachen ER - TY - JOUR A1 - Gebhardt, Andreas T1 - 3D-Druck ist überall. Modische Accessoires, Kleidung, Medikamente, Nahrungsmittel, Autos, Häuser, Waffen, Büsten, Musikinstrumente - alles geht JF - Kunststoffe Y1 - 2015 SN - 0023-5563 VL - 105 IS - 10 SP - 62 EP - 70 PB - Hanser CY - München ER - TY - JOUR A1 - Abbas, Karim A1 - Balc, Nicolae A1 - Bremen, Sebastian A1 - Skupin, Marco T1 - Crystallization and aging behavior of polyetheretherketone PEEK within rapid tooling and rubber molding JF - Journal of Manufacturing and Materials Processing N2 - 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. KW - additive manufacturing KW - fused filament fabrication KW - crystallization KW - polyetheretherketone KW - rapid tooling Y1 - 2022 U6 - https://doi.org/10.3390/jmmp6050093 SN - 2504-4494 N1 - The article belongs to the Special Issue Advances in Injection Molding: Process, Materials and Applications VL - 6 IS - 5 SP - 1 EP - 12 PB - MDPI CY - Basel ER - TY - JOUR A1 - Ziebura, Dawid A1 - Bremen, Sebastian A1 - Schleifenbaum, Johannes Henrich A1 - Gebhardt, Andreas T1 - Machbarkeitsstudie zur Verarbeitung von nicht rostendem Stahl 1.4404 unter Verwendung einer Diodenlaser-basierten LPBF-Maschine mit kartesischem Achssystem JF - RTejournal - Forum für Rapid Technologie Y1 - 2018 SN - 1614-0923 VL - 15 ER - TY - JOUR A1 - Fateri, Miranda A1 - Gebhardt, Andreas A1 - Thümmler, Stefan A1 - Thurn, Laura T1 - Experimental investigation on selective laser melting of glass JF - Physics procedia : 8th International Conference on Laser Assisted Net Shape Engineering LANE 2014 Y1 - 2014 U6 - https://doi.org/10.1016/j.phpro.2014.08.118 SN - 1875-3892 (E-Journal); 1875-3884 (Print) VL - 56 (2014) SP - 357 EP - 364 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Luft, Angela A1 - Bremen, Sebastian A1 - Luft, Nils T1 - A cost/benefit and flexibility evaluation framework for additive technologies in strategic factory planning JF - Processes N2 - There is a growing demand for more flexibility in manufacturing to counter the volatility and unpredictability of the markets and provide more individualization for customers. However, the design and implementation of flexibility within manufacturing systems are costly and only economically viable if applicable to actual demand fluctuations. To this end, companies are considering additive manufacturing (AM) to make production more flexible. This paper develops a conceptual model for the impact quantification of AM on volume and mix flexibility within production systems in the early stages of the factory-planning process. Together with the model, an application guideline is presented to help planners with the flexibility quantification and the factory design process. Following the development of the model and guideline, a case study is presented to indicate the potential impact additive technologies can have on manufacturing flexibility Within the case study, various scenarios with different production system configurations and production programs are analyzed, and the impact of the additive technologies on volume and mix flexibility is calculated. This work will allow factory planners to determine the potential impacts of AM on manufacturing flexibility in an early planning stage and design their production systems accordingly. KW - additive manufacturing KW - factory planning KW - manufacturing flexibility KW - volume flexibility KW - mix flexibility Y1 - 2023 U6 - https://doi.org/10.3390/pr11071968 SN - 2227-9717 VL - 11 IS - 7 PB - MDPI CY - Basel 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 - Rieper, Harald A1 - Gebhardt, Andreas A1 - Stucker, Brent T1 - Selective Laser Melting of the Eutectic Silver-Copper Alloy Ag 28 wt % Cu JF - RTejournal - Forum für Rapid Technologie N2 - 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. KW - SLM KW - Response Surface Method KW - Porositat KW - Eutectic Silver Copper alloy KW - Additive Manufacturing Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?nbn:de:0009-2-44141 SN - 1614-0923 VL - 13 ER - TY - JOUR A1 - Michaux, F. A1 - Mattern, P. A1 - Kallweit, Stephan T1 - RoboPIV: how robotics enable PIV on a large industrial scale JF - Measurement Science and Technology N2 - 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. Y1 - 2018 U6 - https://doi.org/10.1088/1361-6501/aab5c1 SN - 1361-6501 N1 - Special Section on the 12th International Symposium on Particle Image Velocimetry (PIV 2017) VL - 29 IS - 7 SP - 074009 PB - IOP CY - Bristol ER - TY - JOUR A1 - Kunkel, Maximilian Hugo A1 - Gebhardt, Andreas A1 - Mpofu, Khumbaulani A1 - Kallweit, Stephan T1 - Statistical assessment of mechanical properties of selective laser melted specimens of stainless steel JF - The International Journal of Advanced Manufacturing Technology N2 - 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. Y1 - 2018 U6 - https://doi.org/10.1007/s00170-018-2040-8 SN - 0268-3768 VL - 98 IS - 5-8 SP - 1409 EP - 1431 PB - Springer CY - London ER - TY - JOUR A1 - Thomas, Axel T1 - Die Wiederbelebung der Mitarbeiterwohnungsidee bei kommunalen Unternehmen JF - VM Verwaltung und Management Y1 - 2019 U6 - https://doi.org/10.5771/0947-9856-2019-6-286 SN - 0947-9856 VL - 25 IS - 6 SP - 286 EP - 291 PB - Nomos-Verl.-Ges. CY - Baden-Baden ER - TY - JOUR A1 - Wilbring, Daniela A1 - Enning, Manfred T1 - Stromversorgung auf Güterwagen - Aktuelle Bemühungen zur Standardisierung JF - ETR - Eisenbahntechnische Rundschau Y1 - 2019 SN - 0013-2845 VL - 68 IS - 11 SP - 64 EP - 67 PB - DVV Media Group CY - Hamburg ER - TY - JOUR A1 - Wollbrink, Moritz A1 - Maslo, Semir A1 - Zimmer, Daniel A1 - Abbas, Karim A1 - Arntz, Kristian A1 - Bergs, Thomas T1 - Clamping and substrate plate system for continuous additive build-up and post-processing of metal parts JF - Procedia CIRP N2 - 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. Y1 - 2020 U6 - https://doi.org/10.1016/j.procir.2020.04.015 SN - 2212-8271 VL - 93 SP - 108 EP - 113 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schäfer, Johannes A1 - Wilms, Konrad A1 - Schleser, Markus T1 - Aufmischungsarmes, dickschichtiges MSG-Auftragschweißen mit entkoppelter Zweidrahttechnik JF - Schweißen und Schneiden N2 - Für Auftragschweißaufgaben existiert eine Vielzahl an verfahrenstechnischen Prozessvarianten, die je nach Charakteristik und Anwendungsfall ausgewählt werden. Ein Nachteil der vorwiegend verwendeten Metall- Schutzgasschweißprozesse (MSG) für das Auftragschweißen ist durch die direkte Kopplung von Drahtvorschub zu Energieeintrag gegeben. Die vorgestellte Zweidraht-Prozessvariante kann durch die Ausbildung eines übertragenen und eines nicht-übertragenen Lichtbogens die elektrische Leistung beider Lichtbögen variieren und damit einen direkten Einfluss auf die Prozessgrößen Abschmelzleistung und Aufschmelzgrad nehmen. Im Speziellen besteht über die Entkopplung von Drahtvorschub zu Schweißstromstärke die Möglichkeit eines niederenergetischen Betriebs trotz hoher Drahtvorschubgeschwindigkeit. Damit lassen sich Aufschmelzgrade unter 2% umsetzen und Abschmelzleistungen bis zu 15 kg/h realisieren. Y1 - 2017 SN - 0036-7184 VL - 69 IS - 12 SP - 838 EP - 843 PB - DVS Verlag CY - Düsseldorf ER - TY - JOUR A1 - Reichert, Walter T1 - Berufseinstieg für Wirtschaftsingenieure - Bachelor oder Master? JF - Berufsstart Y1 - 2017 ER - TY - JOUR A1 - Klocke, Martina A1 - Richert, Vera A1 - Sube, Maike T1 - Vier Jahre „Guter Studienstart im Ingenieurbereich“: Entwicklung und Perspektiven des „Nullten Semesters“ in Aachen JF - Zeitschrift für Beratung und Studium N2 - Bereits 2015 wurde in der Zeitschrift „Qualität in der Wissenschaft“ (QiW) über das Kooperationsprojekt „Guter Studienstart im Ingenieurbereich“, das Orientierungssemester von RWTH und FH Aachen, berichtet. In diesem Artikel legen wir den Schwerpunkt auf die Entwicklung des Projekts in den Jahren 2015 bis 2018 und geben eine Rückschau sowie einen Ausblick auf die Entwicklungsperspektiven nach dem offiziellen Projektende. Y1 - 2018 SN - 1860-3068 VL - 13 IS - 1 SP - 17 EP - 22 PB - Universitätsverlag Webler CY - Bielefeld ER - TY - JOUR A1 - Thomas, Axel T1 - Technologiezentren in der Aachener Region – Retrospektiven und Perspektiven JF - VM Verwaltung und Management Y1 - 2018 U6 - https://doi.org/10.5771/0947-9856-2018-3-147 SN - 0947-9856 VL - 24 IS - 3 SP - 147 EP - 156 PB - Nomos CY - Baden-Baden ER - TY - JOUR A1 - Thomas, Axel T1 - Zielerreichungen der Technologie- und Gründerzentren aus Sicht der kommunalen Finanzwirtschaft – dargestellt am Beispiel der Aachener Region JF - Der Gemeindehaushalt Y1 - 2018 SN - 0340-3645 VL - 119 IS - 7 SP - 149 EP - 155 PB - Kohlhammer CY - Stuttgart ER - TY - JOUR A1 - Cosma, Cosmin A1 - Kessler, Julia A1 - Gebhardt, Andreas A1 - Campbell, Ian A1 - Balc, Nicolae T1 - Improving the Mechanical Strength of Dental Applications and Lattice Structures SLM Processed JF - Materials N2 - 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. Y1 - 2020 U6 - https://doi.org/10.3390/ma13040905 SN - 1996-1944 VL - 13 IS - 4 SP - 1 EP - 18 PB - MDPI CY - Basel ER - TY - JOUR A1 - Engemann, Heiko A1 - Cönen, Patrick A1 - Dawar, Harshal A1 - Du, Shengzhi A1 - Kallweit, Stephan T1 - A robot-assisted large-scale inspection of wind turbine blades in manufacturing using an autonomous mobile manipulator JF - Applied Sciences N2 - 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. KW - mobile manipulation KW - large-scale inspection KW - wind turbine production KW - autonomous navigation KW - surface-orthogonal path planning Y1 - 2021 U6 - https://doi.org/10.3390/app11199271 SN - 2076-3417 N1 - Belongs to the Special Issue "Advances in Industrial Robotics and Intelligent Systems" VL - 11 IS - 19 SP - 1 EP - 22 PB - MDPI CY - Basel ER - TY - JOUR A1 - Koster, Arie A1 - Scheidweiler, Robert A1 - Tieves, Martin T1 - A flow based pruning scheme for enumerative equitable coloring algorithms JF - A flow based pruning scheme for enumerative equitable coloring algorithms N2 - 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. Y1 - 2016 U6 - https://doi.org/10.48550/arXiv.1607.08754 N1 - Lehrstuhl II für Mathematik, RWTH Aachen University SP - 1 EP - 30 ER - TY - JOUR A1 - Beckenbach, Isabel A1 - Scheidweiler, Robert T1 - Perfect ƒ-Matchings and ƒ-Factors in Hypergraphs - A Combinatorial Approach JF - Discrete Mathematics N2 - 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. Y1 - 2016 U6 - https://doi.org/10.1016/j.disc.2017.05.005 SN - 2192-7782 N1 - Als Volltext auch bei ZIB (Zuse Institute Berlin) VL - 240 IS - 10 SP - 2499 EP - 2506 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Scheidweiler, Robert A1 - Triesch, Eberhard T1 - A note on the duality between matchings and vertex covers in balanced hypergraphs JF - Journal of Combinatorial Optimization N2 - 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. KW - Hall’s Theorem KW - Koenig’s Theorem KW - Duality KW - Balanced hypergraph KW - Hypergraph KW - Vertex cover KW - Matching Y1 - 2016 U6 - https://doi.org/10.1007/s10878-015-9887-5 SN - 1573-2886 N1 - Lehrstuhl II für Mathematik RWTH Aachen VL - 32 IS - 2 SP - 639 EP - 644 PB - Springer CY - Berlin ER - TY - JOUR A1 - Kilic, S. A. A1 - Raatschen, Hans-Jürgen A1 - Körfgen, B. A1 - Apaydin, N. M. A1 - Astaneh-Asl, A. T1 - FE Model of the Fatih Sultan Mehmet Suspension Bridge Using Thin Shell Finite Elements JF - Arabian Journal for Science and Engineering N2 - 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. KW - Suspension bridge KW - 3D nonlinear finite element model KW - Thin shell finite elements KW - Natural frequency KW - Effective modal mass Y1 - 2017 U6 - https://doi.org/10.1007/s13369-016-2316-y SN - 2191-4281 VL - 42 IS - 3 SP - 1103 EP - 1116 PB - Springer Nature ER - TY - JOUR A1 - Schwarz, Alexander A1 - Gebhardt, Andreas A1 - Schleser, Markus A1 - Popoola, Patricia T1 - New Welding Joint Geometries Manufactured by Powder Bed Fusion from 316L JF - Materials Performance and Characterization 8 Y1 - 2019 U6 - https://doi.org/10.1520/MPC20180096 SN - 2379-1365 IS - in press ER - TY - JOUR A1 - Bucur, Alexandru A1 - Lazarescu, Lucian A1 - Pop, Grigore Marian A1 - Achimas, Gheorghe A1 - Gebhardt, Andreas T1 - Tribological performance of biodegradable lubricants under different surface roughness of tools JF - Academic Journal of Manufacturing Engineering Y1 - 2019 SN - 1583-7904 VL - 17 IS - 1 SP - 172 EP - 178 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 - TY - JOUR A1 - Kunkel, Maximilian Hugo A1 - Gebhardt, Andreas A1 - Mpofu, Khumbulani A1 - Kallweit, Stephan T1 - Quality assurance in metal powder bed fusion via deep-learning-based image classification JF - Rapid Prototyping Journal Y1 - 2019 U6 - https://doi.org/10.1108/RPJ-03-2019-0066 SN - 1355-2546 VL - 26 IS - 2 SP - 259 EP - 266 ER - TY - JOUR A1 - Zabirov, Alexander A1 - Schleser, Markus A1 - Bucherer, Sebastian T1 - Füge- und Dichtkonzept für einen Leichtbauverbrennungsmotor JF - adhäsion KLEBEN & DICHTEN Y1 - 2021 U6 - https://doi.org/10.1007/s35145-021-0531-5 SN - 2192-8681 VL - 65 IS - 11 SP - 12 EP - 19 PB - Springer Nature CY - Cham ER - TY - JOUR A1 - Thomas, Axel T1 - Genussrechte als Instrument der Unternehmensfinanzierung von kommunalen Wohnungs- baugesellschaften JF - VM Verwaltung und Management N2 - Die kommunalen Wohnungsbaugesellschaften und ihr Geschäftszweck bzw. Versorgungsauftrag erfahren aus gesamtgesellschaftlichen Gründen aktuell einen erheblichen Bedeutungszuwachs. Der kommunale Wohnungsbau soll und muss intensiviert werden, da z.B. zunehmend Wohnungsbindungen auslaufen. Bezahlbare Neubauten fehlen speziell Familien, Senioren, Studenten und Flüchtlingen. Um das Investitionsvolumen zu bewältigen, bedarf es nicht nur der Förderkredite, sondern auch der Zuführung „frischen Kapitals“. Der Beitrag stellt dar, dass Genussrechte ein interessantes und oft unbekanntes Finanzierungsinstrument für kommunale Wohnungsbaugesellschaften mit passgenauen Ausgestaltungsmöglichkeiten sind. Mit Hilfe von Genussrechten können die notwendigen Neubau-Investitionen solide mit Quasi-Eigenkapital unterlegt werden und den sozialen Wohnungsbau wiederbeleben. Genussrechte als Hybridkapital lassen sich mangels gesetzlicher Eingrenzung exakt und individuell ebenso an die Bedürfnisse der kommunalen Wohnungsbaugesellschaft anpassen wie an die der Gesellschafter und des jeweiligen Neubauvorhabens. Y1 - 2016 U6 - https://doi.org/10.5771/0947-9856-2016-6-322 SN - 0947-9856 VL - 22 IS - 6 SP - 322 EP - 327 PB - Nomos CY - Baden-Baden ER - TY - JOUR A1 - Enning, Manfred T1 - Vom "König der Landstraße" zur "Ameise 4.0" JF - ETR - Eisenbahntechnische Rundschau N2 - Auf Eisenbahn- und Logistikkonferenzen werden gelegentlich Videos von Blattschneiderameisen gezeigt, die effizient und selbstorganisiert große Mengen Material durch den Dschungel transportieren. Daran sollen wir uns ein Beispiel nehmen. 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