@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}},
}

@inproceedings{8909,
  author       = {{Popp, Karl and Sextro, Walter}},
  booktitle    = {{Forschungsvereinigung Verbrennungskraftmaschinen (FW) -lnformationstagung Turbinen}},
  number       = {{504}},
  pages        = {{21--38}},
  title        = {{{Schwingungsanalyse von vorgespannten Schaufeln mit Deckplatten im Schaufelkranz}}},
  year         = {{1999}},
}

@inproceedings{8910,
  author       = {{Sextro, Walter}},
  booktitle    = {{International conference on computational methods in contact mechanics}},
  pages        = {{181--190}},
  title        = {{{Experimental verification of a non-Hertzian contact model}}},
  year         = {{1999}},
}

@inproceedings{8911,
  author       = {{Sextro, Walter}},
  booktitle    = {{ASME Design Engineering Technical Conferences}},
  number       = {{DETC99/VIB-8180}},
  pages        = {{1--10}},
  title        = {{{Forced Vibration of Elastic Structures with Friction Contacts}}},
  year         = {{1999}},
}

@article{8912,
  author       = {{Sextro, Walter and Popp, Karl}},
  journal      = {{Zeitschrift für angewandte Mathematik und Mechanik (ZAMM)}},
  pages        = {{311--312}},
  title        = {{{Ein ebenes Reibkontaktmodell zur Berechnung von Schaufelschwingungen mit Reibelementen}}},
  volume       = {{79}},
  year         = {{1999}},
}

@inproceedings{8913,
  author       = {{Sextro, Walter and Popp, Karl}},
  booktitle    = {{Forschungsvereinigung Verbrennungskraftmaschinen (FW)}},
  number       = {{686}},
  pages        = {{56}},
  title        = {{{Schwingungsanalyse von vorgespannten Schaufeln mit Deckplatten im Schaufelkranz}}},
  year         = {{1999}},
}

@inproceedings{8905,
  author       = {{Hemsel, Tobias and Krome, Jürgen and Littmann, Walter and Wallaschek, Jörg}},
  booktitle    = {{Proceedings 2. Polnisch-Deutscher Workshop "Werkzeuge der Mechatronik"}},
  title        = {{{Modellierung piezoelektrischer Stapel- und Vielschichtaktoren für dynamischen Betrieb}}},
  year         = {{1998}},
}

@inproceedings{8906,
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of VIBROENGINEERING}},
  number       = {{1}},
  pages        = {{7--12}},
  title        = {{{A piezoelectric linear vibration drive for high driving forces}}},
  year         = {{1998}},
}

@inproceedings{8907,
  author       = {{Sextro, Walter and Popp, Karl and Wolter, I}},
  booktitle    = {{International Congress on Combustion Engines, Proceedings of the 22nd CIMAC}},
  pages        = {{257--270}},
  title        = {{{Vibrational Behaviour of Tuned and Detuned Bladed Disks with Friction Dampers}}},
  volume       = {{1}},
  year         = {{1998}},
}

@inproceedings{8908,
  author       = {{Sextro, Walter and Popp, Karl and Wolter, I}},
  booktitle    = {{The 7th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Proceedings of ISROMAC-7}},
  pages        = {{621--630}},
  title        = {{{Three-Dimensional Vibration of Bladed Disk Assemblies with Friction Dampers}}},
  volume       = {{B}},
  year         = {{1998}},
}

@inproceedings{8898,
  author       = {{Goldschmidt, Stefan and Hemsel, Tobias and Krome, Jürgen and Storck, Heiner and Wallaschek, Jörg}},
  booktitle    = {{Tagungsband zum 4. Laser Vibrometer Seminar der Polytec GmbH}},
  title        = {{{Schwingungsprüfstand zur vollautomatischen Messung von Ultraschallschwingungen in piezoelektrischen Antrieben}}},
  year         = {{1997}},
}

@inproceedings{8900,
  abstract     = {{Piezoelectric ultrasonic motors are a new kind of actuators that produce high driving-forces related to their volume. Beside rotary drives like the travelling wave motor many linear drives have been developed and are already commercially available today. These motors can provide static holding-forces and driving-forces of up to 30 N at velocities of up to 220 mm/s. These operational characteristics, which are expected to be improved continuously, make these devices attractive as direct-drives for sliding roofs or windows in automobiles. In this contribution a short outline of the present state-of-the-art of linear ultrasonic motors is given. Different operating principles are compared with respect to the potential driving-force and power. Finally the working-principle of a newly developed motor, which uses the piezoelectric d33-effect, is explained in detail. Theoretical and experimental results show that this motor is capable of achieving high driving-force and rated output-power}},
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the 30th International Symposium on Automotive Technology \& Automation (ISATA)}},
  pages        = {{631--637}},
  title        = {{{Ultrasonic motors for linear positioning tasks in automobiles}}},
  year         = {{1997}},
}

@inproceedings{8901,
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{EUROMECH, European Mechanics Colloquium "Synthesis of Mechatronic Sytems"}},
  number       = {{370}},
  title        = {{{Piezoelectric ultrasonic linear motors}}},
  year         = {{1997}},
}

@inproceedings{8902,
  author       = {{Popp, Karl and Sextro, Walter}},
  booktitle    = {{Forschungsvereinigung Verbrennungskraftmaschinen (FW) -lnformationstagung Turbinen}},
  number       = {{496}},
  pages        = {{131--142}},
  title        = {{{Schwingungsverhalten von verstimmten Beschaufelungen mit Reibelementen}}},
  year         = {{1997}},
}

@inproceedings{8903,
  author       = {{Sextro, Walter}},
  booktitle    = {{VDI-Reihe}},
  number       = {{245}},
  publisher    = {{VDI-Verlag, Düsseldorf}},
  title        = {{{Schwingungsverhalten von Schaufelkränzen mit Reibelementen bei Frequenzverstimmung}}},
  volume       = {{11}},
  year         = {{1997}},
}

@inproceedings{8904,
  author       = {{Sextro, Walter and Popp, Karl and Wolter, Ivo}},
  booktitle    = {{The 1997 International Gas Turbine \& Aeroengine Congress \& Exposition}},
  title        = {{{Improved reliability of bladed disks due to friction dampers}}},
  year         = {{1997}},
}

@inproceedings{8896,
  author       = {{Popp, Karl and Sextro, Walter}},
  booktitle    = {{Forschungsvereinigung Verbrennungskraftmaschinen (FW) - lnformationstagung Turbinen}},
  number       = {{490}},
  pages        = {{53--76}},
  title        = {{{Schwingungsverhalten eines Schaufelkranzes mit Reibelementen bei Frequenzverstimmung}}},
  year         = {{1996}},
}

@inproceedings{8897,
  author       = {{Popp, Karl and Sextro, Walter}},
  booktitle    = {{The 2nd European Nonlinear Oscillation Conference - Proceedings of EUROMECH}},
  number       = {{518}},
  pages        = {{157--183}},
  title        = {{{Dynamical Behaviour of a Bladed Disk with Friction Dampers}}},
  volume       = {{1}},
  year         = {{1996}},
}

@article{8895,
  author       = {{Sextro, Walter and Schmalhorst, B}},
  journal      = {{Zeitschrift für angewandte Mathematik und Mechanik (ZAMM)}},
  pages        = {{255--257}},
  title        = {{{Static Behaviour of Drill Strings in Curved Boreholes}}},
  volume       = {{73}},
  year         = {{1993}},
}