@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{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{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}},
}

@inbook{8894,
  abstract     = {{Dry friction is a main factor of self-sustained oscillations in dynamic systems. The mathematical modelling of dry friction forces result in strong nonlinear equations of motion. The bifurcation behaviour of a deterministic system has been investigated by the bifurcation theory. The stability of stationary solutions has been analyzed by the eigenvalues of the Jacobian. Period doublings and Hopf-bifurcations as well as turning points could be determined with the program package BIFPACK. Phase plane plots of periodic and chaotic motions have been shown for a better understanding of the bifurcation diagrams. Both, unstable branches and stable coexisting solutions have been calculated. Several jumping effects, which are typical for nonlinear systems, have been found.}},
  author       = {{Stelter, Peter and Sextro, Walter}},
  booktitle    = {{Bifurcation and Chaos: Analysis, Algorithms, Applications}},
  editor       = {{Seydel, R. and Schneider, F.W. and Küpper, T. and Troger, H.}},
  isbn         = {{978-3-0348-7006-1}},
  pages        = {{343--347}},
  publisher    = {{Birkhäuser Basel}},
  title        = {{{Bifurcations in Dynamic Systems with Dry Friction}}},
  doi          = {{10.1007/978-3-0348-7004-7_44}},
  volume       = {{97}},
  year         = {{1991}},
}