TY - BOOK A1 - Mautner, Karin T1 - Numerical treatment of the Black-Scholes variational inequality in computational finance Y1 - 2006 N1 - Humboldt-Univ., Diss CY - Berlin ER - TY - JOUR A1 - Mautner, Karin A1 - Forster, Ralf A1 - Kornhuber, Ralf A1 - Sander, Oliver T1 - Fast and Reliable Pricing of American Options with Local Volatility / Forster, Ralf ; Kornhuber, Ralf ; Mautner, Karin ; Sander, Oliver JF - Domain Decomposition Methods in Science and Engineering XVII Y1 - 2008 SN - 978-3-540-75198-4 N1 - Lecture Notes in Computational Sciece and Engineering ; 60 SP - 383 EP - 390 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 - CHAP A1 - Michaux, Frank A1 - Brunn, André A1 - Willert, Christian A1 - Kallweit, Stephan T1 - Automatic setup and calibration of a Robotic-PIV system using fiducial markers T2 - 21st International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics N2 - The use of industrial robots allows the precise manipulation of all components necessary for setting up a large-scale particle image velocimetry (PIV) system. The known internal calibration matrix of the cameras in combination with the actual pose of the industrial robots and the calculated transform from the fiducial markers to camera coordinates allow the precise positioning of the individual PIV components according to the measurement demands. In addition, the complete calibration procedure for generating the external camera matrix and the mapping functions for e.g. dewarping the stereo images can be automatically determined without further user interaction and thus the degree of automation can be extended to nearly 100%. This increased degree of automation expands the applications range of PIV systems, in particular for measurement tasks with severe time constraints. KW - PIV calibration KW - Automation KW - Robotics KW - Fiducial marker system KW - Recognition algorithms Y1 - 2024 U6 - https://doi.org/10.55037/lxlaser.21st.163 N1 - 21st International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal, July 8-11, 2024 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 - 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 - CHAP A1 - Nakagawa, Masaki A1 - Kallweit, Stephan A1 - Michaux, Frank A1 - Hojo, Teppei T1 - Typical Velocity Fields and Vortical Structures around a Formula One Car, based on Experimental Investigations using Particle Image Velocimetry T2 - SAE International Journal of Passenger Cars - Mechanical Systems Y1 - 2016 U6 - https://doi.org/10.4271/2016-01-1611 SN - 1946-4002 ER - TY - CHAP A1 - Pak, Daniel A1 - Piegeler, D. A1 - Feldmann, Markus A1 - Schleser, Markus A1 - Dilthey, Ulrich ED - Hegger, Josef T1 - Hybrid joints of textile reinforced concrete parts - designed for assembly T2 - Textile reinforced concrete : proceedings of the 1. International RILEM Conference, held at the RWTH Aachen, September 6/7, 2006. (RILEM proceedings ; 50) Y1 - 2006 SN - 2-912143-97-7 SP - 181 EP - 190 PB - RILEM Publ. CY - Bagneux ER - TY - JOUR A1 - Panc, Nicolae A1 - Contiu, Glad A1 - Bocanet, Vlad A1 - Thurn, Laura A1 - Sabau, Emilia T1 - The influence of cutting technology on surface wear hardness JF - Academic Journal of Manufacturing Engineering Y1 - 2019 SN - 1583-7904 VL - 17 IS - 3 SP - 205 EP - 210 ER - TY - CHAP A1 - Peeken, Heinz A1 - Troeder, Christoph A1 - Benner, Joachim A1 - Platt, Werner T1 - A new approach to describe the mechanical performance of flexible couplings in drive systems T2 - Proceedings of the International Conference on Rotordynamics : September 14 - 17, 1986, Tokyo Y1 - 1986 N1 - International Conference on Rotordynamics <1986, Tōkyō> SP - 159 EP - 163 PB - IFToMM CY - Tokyo ER - TY - THES A1 - Pfaff, Raphael T1 - Modelling of nonlinear systems using piecewise defined models Y1 - 2006 N1 - Coventry, Univ., Masterarbeit, 2006 ER - TY - THES A1 - Pfaff, Raphael T1 - Automated processing of the ISL Doppler images Y1 - 2007 N1 - Hagen, Fernuniv., Bachelorarbeit, 2007 ER - TY - THES A1 - Pfaff, Raphael T1 - Evaluation and extension of the potential for application of the behavioural framework to practical engineering problems Y1 - 2013 N1 - Coventry, Univ., Diss., 2013 ER - TY - JOUR A1 - Pfaff, Raphael T1 - Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach JF - Railway Engineering Science N2 - The first and last mile of a railway journey, in both freight and transit applications, constitutes a high effort and is either non-productive (e.g. in the case of depot operations) or highly inefficient (e.g. in industrial railways). These parts are typically managed on-sight, i.e. with no signalling and train protection systems ensuring the freedom of movement. This is possible due to the rather short braking distances of individual vehicles and shunting consists. The present article analyses the braking behaviour of such shunting units. For this purpose, a dedicated model is developed. It is calibrated on published results of brake tests and validated against a high-definition model for low-speed applications. Based on this model, multiple simulations are executed to obtain a Monte Carlo simulation of the resulting braking distances. Based on the distribution properties and established safety levels, the risk of exceeding certain braking distances is evaluated and maximum braking distances are derived. Together with certain parameters of the system, these can serve in the design and safety assessment of driver assistance systems and automation of these processes. KW - Freight rail KW - Shunting KW - Braking curves KW - Brake set-up KW - Driver assistance system Y1 - 2023 U6 - https://doi.org/10.1007/s40534-023-00303-7 SN - 2662-4753 (eISSN) SN - 2662-4745 (Print) VL - 31 IS - 2 SP - 135 EP - 144 PB - SpringerOpen ER - TY - CHAP A1 - Pfaff, Raphael T1 - Analysis of Big Data Streams to obtain Braking Reliability Information for Train Protection systems T2 - Asia-Pacific Conference of the Prognostics and Health Management Society Y1 - 2017 N1 - Asia-Pacific Conference of the Prognostics and Health Management Society, Jeju, Korea 2017 SP - 1 EP - 7 ER - TY - CHAP A1 - Pfaff, Raphael A1 - Burnham, Keith J. T1 - On abstraction and interpretability: a behavioural perspective T2 - 19th International Conference on Systems Engineering 2008 : ICSENG '08 : 19 - 21 Aug. 2008, University of Nevada, Las Vegas, Nevada Y1 - 2008 SN - 978-0-7695-3331-5 ; 978-0-7695-2719-2 SP - 89 EP - 94 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Pfaff, Raphael A1 - Burnham, Keith J. T1 - On abstraction and interpretability: a behavioural perspective JF - Systems Science Y1 - 2009 SN - 0137-1223 VL - Vol. 35 IS - Iss. 2 SP - 19 EP - 26 ER - TY - CHAP A1 - Pfaff, Raphael A1 - Larkowski, Tomasz A1 - Burnham, Keith J. T1 - An application of adaptive control in the behavioural framework T2 - 21st International Conference on Systems Engineering (ICSEng) : 16 - 18 Aug. 2011, Las Vegas, Nevada ; proceedings Y1 - 2011 SN - 978-1-4577-1078-0 ; 978-0-7695-4495-3 SP - 49 EP - 54 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Pfaff, Raphael A1 - Larkowski, Tomasz A1 - Burnham, Keith J. T1 - An approach to adaptive control in the behavioural framework T2 - UKACC International Conference on Control 2010 (CONTROL 2010) : Coventry, United Kingdom, 7 - 10 September 2010 ; Vol. 2. (IET seminar digest ; 2010/004) Y1 - 2010 SN - 978-1-62748-119-9 SP - 833 EP - 838 PB - Curran CY - Red Hook, NY ER - TY - CHAP A1 - Pfaff, Raphael A1 - Melcher, Karin A1 - Franzen, Julian T1 - Rare event simulation to optimise maintenance intervals of safety critical redundant subsystems T2 - Proceedings of the European Conference of the PHM Society Y1 - 2018 VL - 4 IS - 1 SP - 1 EP - 6 ER -