@inproceedings{Rill, author = {Rill, Georg}, title = {TMeasy 6.0-A handling tire model that incorporates the first two belt eigenmodes}, series = {Proceedings of the XI International Conference on Structural Dynamics (EURODYN 2020): Athens, Greece, 23.11.2020 - 26.11.2020}, booktitle = {Proceedings of the XI International Conference on Structural Dynamics (EURODYN 2020): Athens, Greece, 23.11.2020 - 26.11.2020}, publisher = {EASD Procedia}, doi = {10.47964/1120.9054.18673}, pages = {676 -- 689}, abstract = {TMeasy 6.0, an extension to the standard TMeasy tire model of version 5.3, takes the relevant first two rigid body eigenmodes of the belt into consideration. These modes represent the in plane longitudinal and rotational movements of the belt relative to the rim. The dynamics of the longitudinal force is of higher order then and reproduces the tire wheel vibrations, required for indirect tire-pressure monitoring systems (iTPMS), sufficiently well. A tailored implicit solver, which takes the stiff coupling between the longitudinal force and the belt motions into account, still provides real-time performance in addition. Simulation examples show that a rigid body vehicle model equipped with TMeasy 6.0 makes it possible to investigate second generation indirect tire-pressure monitoring systems.}, language = {en} } @article{GrossmannSchlegl, author = {Großmann, Benjamin and Schlegl, Thomas}, title = {Development of a Hybrid Path/Force Control Architecture for an Assisting Robot}, series = {International journal of mechanics and control : JoMaC}, volume = {15}, journal = {International journal of mechanics and control : JoMaC}, number = {1}, publisher = {Levrotto\&Bella}, address = {Torino}, issn = {1590-8844}, pages = {27 -- 34}, abstract = {For human machine interaction a control ar chitecture for the force controlled guidance mode of a five axis robot is developed. This enables a human operator to move the robot easily by applying forces at th e end-effector. The position and th e path can then be tracked and stored for a later reuse. The control archit ecture is also used in a hybrid mode where it is possible to control chosen workspace coordinates with a path controller and others with a force controller. The hybrid mode is especially used to cut tissue material with a scalpel which is mounted at the robots effector.}, language = {en} } @inproceedings{Rill, author = {Rill, Georg}, title = {A Three-Dimensional and Nonlinear Virtual Test Car}, series = {ENOC 2022, book of abstracts, 10th European Nonlinear Dynamics Conference: July 17-22, 2022, Lyon, France}, booktitle = {ENOC 2022, book of abstracts, 10th European Nonlinear Dynamics Conference: July 17-22, 2022, Lyon, France}, address = {Lyon}, pages = {49 -- 58}, abstract = {Virtual testing procedures have become a standard in vehicle dynamics. The increasing complexity of driver assistance sys- tems demand for more and more virtual tests, which are supposed to produce reliable results even in the limit range. As a consequence, simplified vehicle models, like the classical bicycle model or 4-wheel vehicle models, have to be replaced by a fully three-dimensional and nonlinear vehicle model, which also encompasses the details of the suspension systems. This paper presents a passenger car model, where the chassis, the four knuckles, and the four wheels are described by rigid bodies, the suspension system is modeled by the generic design kinematics, and the TMeasy tire model provides the tire forces and torques in all driving situations.}, language = {en} } @article{AntenLebsanftKraussetal., author = {Anten, Kerstin and Lebsanft, Markus and Krauß, M. and Noster, Ulf and Scholtes, Berthold}, title = {Einfluss von Randschichtzustand und Haltezeit auf die thermische Erm{\"u}dung der Magnesiumbasislegierung AZ31}, series = {Materialwissenschaft und Werkstofftechnik}, volume = {43}, journal = {Materialwissenschaft und Werkstofftechnik}, number = {12}, publisher = {Wiley}, pages = {993 -- 1000}, abstract = {Die vorliegende Arbeit befasst sich mit Untersuchungen zur thermischen Erm{\"u}dung der Magnesiumbasislegierung AZ31 im Temperaturbereich zwischen +50°C und +290°C. Die Experimente erfolgten unter konstanter Totaldeformation (out-of-phase-Beanspruchung) und es wurde der Verlauf der Spannungsamplitude sowie der plastischen Dehnungsamplitude {\"u}ber die Zahl der Temperaturzyklen ermittelt. Insbesondere wurde der Einfluss einer mechanischen Oberfl{\"a}chenbehandlung (Festwalzen) sowie von Haltezeiten auf den Verlauf der Sch{\"a}digung untersucht. In beiden F{\"a}llen konnte kein signifikanter Unterschied zu unbehandelten Proben bzw. Beanspruchungen ohne Haltezeit festgestellt werden, welches auf die Wechselwirkungen zwischen Verformungs- und Rekristallisationsprozessen bei der thermischen Erm{\"u}dung zur{\"u}ckzuf{\"u}hren ist.}, language = {en} } @article{HofmannHierl, author = {Hofmann, A. and Hierl, Stefan}, title = {Kontrolliertes Laserdurchstrahlschweißen}, series = {Kunststoffe}, volume = {95}, journal = {Kunststoffe}, number = {6}, publisher = {Hanser}, pages = {36 -- 38}, abstract = {Obwohl das Laserdurchstrahlschweißen sehr reproduzierbar arbeitet, k{\"o}nnen Fehler aus den Vorprozessen Compoundieren, Spritzgießen etc. das Schweißergebnis negativ beeinflussen. Dem Anwender steht inzwischen eine breite Palette an Prozess{\"u}berwachungsmethoden zur Verf{\"u}gung, um eine gleich bleibende Produktqualit{\"a}t zu erzielen.}, language = {de} } @inproceedings{JuijermAltenbergerNosteretal., author = {Juijerm, Patiphan and Altenberger, Igor and Noster, Ulf and Scholtes, Berthold}, title = {Residual stress relaxation and cyclic deformation behavior of deep rolled AlMg4.5Mn (AA5083) at elevated temperatures}, series = {Materials Science Forum}, volume = {490-491}, booktitle = {Materials Science Forum}, publisher = {Trans Tech Publications}, doi = {10.4028/www.scientific.net/MSF.490-491.436}, pages = {436 -- 441}, abstract = {The cyclic deformation behavior of deep rolled and polished aluminium wrought alloy AlMg4,5Mn in the temperature range 20-300°C has been investigated. Results of quasistatic tension and compression tests of untreated specimens in the temperature range 20-300°C are presented. To characterize the fatigue behavior for stress-controlled tests as a function of test temperature, s-n curves, cyclic deformations curves and mean strains as a function of number of cycles are given. The residual stress- and work hardening states near the surface of deep rolled aluminium alloy AlMg4.5Mn before and after fatigue tests were investigated by X-ray diffraction methods. The investigated AlMn4.5Mn aluminium alloy shows cyclic hardening until fracture at all stress amplitudes in stress-controlled fatigue tests at 25-150°C. With increasing temperature the deformation behavior shifts from cyclic hardening to cyclic softening. Below a certain stress amplitude at a given temperature deep rolling led to a reduction of the plastic strain amplitude as compared to the untreated state through cyclically stable near-surface work hardening as indicated by stable FWHM-values. This reduction in plastic strain amplitude is associated with enhanced fatigue lives. The effectiveness of deep rolling is governed by the cyclic and thermal stability of near-surface work hardening rather than macroscopic compressive residual stresses. Since near-surface work hardening is known to retard crack initiation, deep rolling is also effective in temperature- and stress ranges where macroscopic compressive residual stresses have relaxed almost completely, but where near-surface work hardening prevails. Above certain stress amplitudes and temperatures, deep rolling has no beneficial effect on the fatigue behavior of AlMg4.5Mn. This is a consequence of instable near-surface microstructures, especially instable near-surface work hardening.}, language = {en} } @article{KettnerNosterKilianetal., author = {Kettner, Michael and Noster, Ulf and Kilian, Helmut and Gradinger, Rudolf and Kuehlein, Wolfgang and Drevenstedt, Armin and Stadler, Franz and Ladstaetter, Elisabeth and Lutz, Andreas}, title = {The InnMag project - Processing Mg for civil aircraft application}, series = {Advanced Engineering Materials}, volume = {9}, journal = {Advanced Engineering Materials}, number = {9}, publisher = {Wiley}, doi = {10.1002/adem.200700143}, pages = {813 -- 819}, abstract = {In the context of the "InnMag" project, partners from industry and science are co-operating to investigate the issues involved in adapting established production processes to the material Mg. The project's aim is to further the deployment of Mg interior parts in civil aircraft. The project covers every production step, from alloy selection, Mg ingot melting, alloying, direct chill casting, extruding, machining, surface treatment and component assembly. This paper discusses the project's targets and the results arrived at so far, particularly in the areas of direct chill casting and extrusion.}, language = {en} } @article{LorenzKoenig, author = {Lorenz, Bj{\"o}rn and K{\"o}nig, Alexander}, title = {TPM und lean production - Zwei unterschiedliche ans{\"a}tze?}, series = {Zeitschrift fuer Wirtschaftlichen Fabrikbetrieb : ZWF}, volume = {106}, journal = {Zeitschrift fuer Wirtschaftlichen Fabrikbetrieb : ZWF}, number = {11}, publisher = {de Gruyter}, address = {Berlin}, pages = {803 -- 806}, abstract = {Bisher wurden TPM und Lean Production meist differenziert voneinander betrachtet. Der TPM-Gedanke ist jedoch die konsequente Fortf{\"u}hrung des Lean Thinking. Ein effektives Anlagenmanagement ist die Voraussetzung f{\"u}r das Erzeugen eines Produktionsflusses. In der Vergangenheit wurde TPM h{\"a}ufig ohne die Basis eines Produktionssystems eingef{\"u}hrt. Der zweite Schritt erfolgte vor dem ersten. Logistische Themen und die Optimierung von Arbeitspl{\"a}tzen mitarbeiterintensiver Bereiche wurden ebenfalls nur mit geringer Tiefe behandelt. Die OEE (Overall Equipment Effectiveness) allein ist hierbei kein ausreichender Indikator f{\"u}r ein schlankes Produktionssystem, da eine R{\"u}stzeitoptimierung mit der Reduzierung der Losgr{\"o}ße einen Zielkonflikt hervorrufen kann. Ein Ansatz, bei dem die EPEI-Kennzahl (Every Part Every Intervall) und die OEE gemeinsam betrachtet werden, stellt eine L{\"o}sung dar. Durch die verst{\"a}rkte Fokussierung auf Ganzheitliche Produktionssysteme r{\"u}ckt TPM als ein wichtiger Baustein, oder bei einer entsprechenden Weiterentwicklung zum System, als aufbauender Ansatz in den Blickpunkt der Unternehmen.}, language = {de} } @article{MundlNoster, author = {Mundl, A. and Noster, Ulf}, title = {Topology optimization using a structural component as example}, series = {Konstruktion}, journal = {Konstruktion}, number = {1-2}, publisher = {VDI Fachmedien ; Springer}, address = {D{\"u}sseldorf}, pages = {65 -- 68}, language = {en} } @inproceedings{UcsnikGradingerNosteretal., author = {Ucsnik, Stephan A. and Gradinger, Rudolf and Noster, Ulf and Pahr, Dieter H.}, title = {Finite element based optimization of a novel metal-composite-joint}, series = {1st EUCOMAS, European Conference on Materials and Structures in Aerospace, Conference Berlin, May 26 - 27, 2008 }, booktitle = {1st EUCOMAS, European Conference on Materials and Structures in Aerospace, Conference Berlin, May 26 - 27, 2008 }, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, issn = {0083-5560}, pages = {371 -- 379}, abstract = {Aerospace and automotive industries employ three main techniques to set up joints between metal and fibre reinforced plastics parts (FRP); adhesive bonding, mechanical fastening with rives/bolts and a hybrid combination. A new joint technique has been developed to combine the two advantageous mechanisms form-closure and adhesion in a fibre-friendly way. Prior is established through metal structures (pins) which are perpendicularly welded onto metal surfaces with an arc-welding-process. They intrude into the FRP during lay-up and therefore set up a first connection. The composite-matrix is responsible for latter adhesive bonding and final form closure. Finite-element-analyses of cylindrically shaped joints are carried out to get detailed knowledge of the influence of parameters like pin-number, pin-position, pin-height, pin-form sleeve-geometry, and stiffness behaviour. Long calculation times of 3D-models lead to the introduction of a corresponding 2D-axisymmetric-model which is used to run parameter-studies within a reasonable time. For this novel technique the combination of fibre-friendly form closure and adhesive bonding of interface plays a major role. A well selected amount of vertical reinforcements, their placement and geometrical dimensions will lead to a stiffer joint. Goal is to minimize fibre-deletion and overlap length to improve load-transfer and joint-strength, to reduce weight in high-strength-applications as well as the avoidance of safety rivets.}, language = {en} }