@article{21002, author = {{Hahn, O. and Koyro, M. and Meschut, Gerson}}, journal = {{der praktiker }}, pages = {{356--361}}, title = {{{Kleben in Kombination mit Fügen durch Umformen}}}, volume = {{9}}, year = {{2000}}, } @inproceedings{21003, author = {{Bohling, P. and Jüttner, S. and Kaiser, M. and Meschut, Gerson and Schumann, S.}}, isbn = {{ISBN 3-9805447-3-7}}, location = {{Paderborn}}, pages = {{199--210}}, title = {{{Eigenschaften von thermisch und wärmearm gefügten Al-/Mg-Verbindungen für den strukturellen Karosserieleichtbau}}}, year = {{2000}}, } @article{21006, author = {{Meschut, Gerson}}, journal = {{Adhäsion}}, number = {{11}}, pages = {{14--21}}, title = {{{Eigenschaftsoptimierte Verbindungen durch wärmearmes Hybridfügen}}}, volume = {{44}}, year = {{2000}}, } @inproceedings{21007, author = {{Koyro, M. and Meschut, Gerson}}, booktitle = {{Tagungsband zur 4. Jahres- und 1. Europäischen Fachkonferenz “Kleben im Automobilbau”}}, location = {{Bad Nauheim}}, pages = {{114--126}}, title = {{{Status und Weiterentwicklungsmöglichkeiten beim strukturellen Kleben bei Spaceframe-Konstruktionen}}}, year = {{2000}}, } @misc{23424, author = {{Zimmer, Detmar}}, title = {{{Aus einem Getriebemodul und einem Antriebsmodul bestehende Antriebseinheit}}}, year = {{2000}}, } @misc{23425, author = {{Zimmer, Detmar}}, title = {{{Getriebebaukasten mit Kronengetriebe}}}, year = {{2000}}, } @article{8914, abstract = {{Piezoelectric ultrasonic motors have been investigated for several years and have already found their first practical applications. Their key feature is that they are able to produce a high thrust force related to their volume. Beside rotary drives like the travelling wave motor, linear drives have also been developed, but only a few are presently commercially available. In the present paper, we first describe the state of the art of linear piezoelectric motors. The motors are characterized with respect to their no-load velocity, maximum thrust force, efficiency and other technical properties. In the second part, we present a new motor, which is judged to be capable of surpassing the characteristics of other piezoelectric motors because of its unique design which allows the piezoelectric drive elements to be pre-stressed in the direction of their polarization. The piezoelectric elements convert energy using the longitudinal d33 effect which allows an improved reliability, large vibration amplitudes and excellent piezoelectric coupling. Energy loss by vibration damping is minimized, and the efficiency can be improved significantly. Experimental results show that the motor characteristics can be optimized for a particular task by choosing the appropriate operating parameters such as exciting voltage, exciting frequency and normal force. }}, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, issn = {{0041-624X}}, journal = {{Ultrasonics}}, keywords = {{Linear motor}}, pages = {{37 -- 40}}, title = {{{Survey of the present state of the art of piezoelectric linear motors}}}, doi = {{10.1016/S0041-624X(99)00143-2}}, volume = {{38}}, year = {{2000}}, } @inproceedings{8915, abstract = {{Ultrasonic linear motors have now been investigated for several years. Their key features are high thrust forces related to their volume and good position-accuracy. This contribution consists of two main parts. In the first part we describe the state-of-the-art of linear piezoelectric motors. Characteristics like no-load velocity, maximum thrust force and other technical properties of commercially available devices will be reported as well as those of prototypes. In the second part we report an ongoing research and development project aiming at a linear piezoelectric motor, which is capable of surpassing some of the shortcomings of other piezoelectric motors}}, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, booktitle = {{Ultrasonics Symposium, 2000 IEEE}}, issn = {{1051-0117}}, keywords = {{linear motors, ultrasonic motors, linear piezoelectric motor, maximum thrust force, no-load velocity, ultrasonic linear motor, Electromagnetic devices, Electromagnetic fields, Frequency, Friction, Gears, Materials science and technology, Piezoelectric materials, Research and development, Vibrations, Wheels}}, pages = {{663--666 vol.1}}, title = {{{State of the art and development trends of ultrasonic linear motors}}}, doi = {{10.1109/ULTSYM.2000.922635}}, volume = {{1}}, year = {{2000}}, } @inproceedings{8916, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, booktitle = {{Tagungsband der ACTUATOR}}, pages = {{250--253}}, title = {{{Piezoelectic linear motors}}}, year = {{2000}}, } @inproceedings{8917, abstract = {{Piezoelektrische Schwingungsantriebe sind Kleinmotoren, deren Funktionsprinzip darin besteht, dass elektrische Energie mit Hilfe von Piezokeramiken in mechanische Schwingungsenergie gewandelt und diese dann durch hochfrequente Kontaktvorgänge auf den anzutreibenden Teil übertragen wird. Der Stand der Technik auf dem Gebiet piezoelektrischer Linearantriebe zeigt, dass viele piezoelektrische Linearantriebe bereits zufriedenstellende Leistungsmerkmale aufweisen. Gleichzeitig ist zu erwarten, dass die Leistungen dieser Antriebe noch deutlich verbessert werden können. Ein Ansatz, insbesondere den Wirkungsgrad und die mechanische Leistung zu erhöhen, wird anhand eines Motors aufgezeigt, der am Heinz Nixdorf Institut entwickelt wurde. Eine Übersicht der in ausgewählten Einsatzgebieten geforderten Leistungsdaten führt auf Entwicklungsziele für bestehende und neuartige piezoelektrische Linearantriebe.}}, author = {{Hemsel, Tobias and Wallaschek, Jörg}}, pages = {{147--166}}, title = {{{Stand der Technik und Entwicklungsperspektiven linearer piezoelektrischer Schwingungsantriebe}}}, volume = {{1533}}, year = {{2000}}, } @article{8918, abstract = {{The paper deals with cyclic periodic structures modelling bladed disk assemblies of blades with friction elements for vibration damping. These elements placed between adjacent blades reduce the vibration amplitudes by means of dry friction resulting from centrifugal forces acting on the elements and relative displacements of the blades. However, the application of these friction elements results in an additional dynamical coupling which together with mistuning of some system parameters (e.g., blade eigenfrequency or contact parameters) may cause localization of vibration. In the present paper a linear approximation of such a system is investigated. The structure composed of cyclic periodic cells modelled each as a clamped-free beam interacting with each other by means of viscoelastic elements of complex stiffness is applied for dynamic system analysis. In case of free vibrations as well as in case of steady-state dynamic response to a harmonic pressure field, a perfect periodic structure and the structures with periodically mistuned parameters (blade eigenfrequencies and contact parameters) are studied. Some regularities in the dynamic response of the systems with mistuning have been noticed. Despite the fact that only a linear approximation has been used, the results and conclusions can be applied for models which describe the blade interaction in a nonlinear way.}}, author = {{Krzyzynski, Tomasz and Popp, Karl and Sextro, Walter}}, issn = {{0960-0779}}, journal = {{Chaos, Solitons \& Fractals}}, number = {{10}}, pages = {{1597 -- 1609}}, title = {{{On some regularities in dynamic response of cyclic periodic structures}}}, doi = {{10.1016/S0960-0779(99)00080-6}}, volume = {{11}}, year = {{2000}}, } @inproceedings{8919, abstract = {{the vibration amplitudes of bladed disk assemblies can be reduced significantly by means of friction damping devices such as shrouds, damping wires and interblade Friction dampers. in practice, interblade Friction dampers are applied in rotating arrangements with various geometries showing curved or flat surfaces like so-called wedge-shaped dampers. this paper is focusing on a computation method to predict the dynamical behaviour of turbine blades with Friction dampers including both, curved and wedge-shaped dampers with hertzian and non-herutian contact conditions, respectively. the presented computation method uses a 3d contact model to calculate the contact forces, including normal and tangential stiffnesses, roughness and microslip effects. the relative displacements in the contact area can be expressed by means of 6 dof of the blade platforms and 6 rigid body dof of the damper including translational and rotational displacements. the relative displacement of the Friction damper with respect to the adjacent blades can be derived from the contact kinematics of the blade-damper-blade system and the equations of motion of the Friction damper. thus, the model can be applied to investigate spatial motions of the bladed disk assembly including bending and torsional vibrations. a comparison of different Friction damper designs with respect to an optimal damper geometry and damper mass is presented. the advantages and disadvantages of each design will be discussed. experimental results are shown to validate the developed computation method.}}, author = {{Panning, Lars and Sextro, Walter and Popp, Karl}}, booktitle = {{International Gas Turbine \& Aeroengine Congress \& Exhibition, ASME}}, pages = {{1--8}}, title = {{{Optimization of Interblade Friction Damper}}}, year = {{2000}}, } @inproceedings{8920, author = {{Sextro, Walter}}, booktitle = {{International Gas Turbine \& Aeroengine Congress \& Exhibition, ASME}}, pages = {{1--8}}, title = {{{The Calculation of the Forced Response of Shrouded Blades with Friction Contacts and Its Experimental Verification}}}, year = {{2000}}, } @article{13174, author = {{Luke, Andrea and Baumhögger, Elmar and Scheunemann, P.}}, issn = {{0276-1459}}, journal = {{Multiphase Science and Technology}}, title = {{{3-DIMENSIONAL DESCRIPTION OF THE MICROSTRUCTURE OF HEATED SURFACES IN NUCLEATE POOL BOILING}}}, doi = {{10.1615/multscientechn.v12.i3-4.20}}, year = {{2000}}, } @inproceedings{45511, author = {{Mahnken, Rolf and Del Linz, Sandra and Stein, Erwin}}, location = {{Barcelona}}, title = {{{Non-linear mixed isotropic-kinematic hardening coupled with damage in the framework of finite deformation elasto-plasticity}}}, year = {{2000}}, } @inproceedings{20948, author = {{Walther, U. and Meschut, Gerson}}, booktitle = {{Tagungsband zum Technologie Kolleg: Kleben – Grundlagen, Forschungsergebnisse, Anwendungen}}, location = {{Regensburg}}, pages = {{141--155}}, title = {{{Einflüsse der Klebstoffverarbeitung auf die Produktqualität}}}, year = {{1999}}, } @inproceedings{20953, author = {{Eis, M. and Hahn, O. and Meschut, Gerson}}, booktitle = {{Tagungsband zur Werkstoffwoche 1998}}, isbn = {{ISBN 3-527-29943-2}}, location = {{Weinheim}}, pages = {{327--332}}, publisher = {{Wiley-VCH Verlag}}, title = {{{Kleben dünnwandiger Fahrzeugkomponenten aus Stahl}}}, volume = {{6}}, year = {{1999}}, } @inproceedings{20954, author = {{Hahn, O. and Meschut, Gerson and Koyro, M.}}, booktitle = {{Tagungsband zur Werkstoffwoche 1998}}, isbn = {{ISBN 3-527-29943-2}}, location = {{Weinheim}}, pages = {{357--360}}, publisher = {{Wiley-VCH Verlag}}, title = {{{Quasistationäre Meßmethode zur Ermittlung der Wärmeleitfähigkeit von Klebverbindungen}}}, volume = {{6}}, year = {{1999}}, } @techreport{20955, author = {{Hahn, O. and Kurzok, J. and Meschut, Gerson}}, title = {{{Fügen von Leichtmetall-Strangpreßprofilen mittels Kleben und Fügen durch Umformen}}}, year = {{1999}}, } @inproceedings{20959, author = {{Hahn, O. and Peetz, A. and Meschut, Gerson}}, booktitle = {{Tagungsband zur Swiss Bondung ´99}}, location = {{Rapperswil (CH)}}, pages = {{225--239}}, title = {{{Hybridfügen – Eine Fügetechnik für den eigenschaftsoptimierten Leichtbau}}}, year = {{1999}}, }