---
res:
  bibo_abstract:
  - In turbomachinery, friction contacts are widely used to reduce dynamic stresses
    in turbine blades in order to avoid expensive damages. As a result of energy dissipation
    in the friction contacts the blade vibration amplitudes are reduced. In case of
    so-called friction dampers, which are pressed on the platforms of the blades by
    centrifugal forces, the damping effect can be optimized by varying the damper
    mass. This optimization can be done by means of a simulation model applying the
    so-called component mode synthesis and the Harmonic Balance Method to reduce computation
    time. It is based on the modal description of each substructure. In a real turbine
    or compressor blading great differences in the magnitude of the individual blade
    amplitudes occur caused by unavoidable mistuning of all system parameters like
    contact parameters and natural frequencies of the blades. It may happen that most
    of the blades experience only small stresses whereas a few blades experience critical
    stresses. Therefore, it is necessary to consider mistuning for all system parameters
    to simulate the forced response of bladed disk assemblies with friction contacts.
    For a mistuned bladed disk the complete system has to be modeled to calculate
    the dynamic response. In practice, usually the standard deviations instead of
    the distributions of the system parameters are known. Therefore, Monte-Carlo simulations
    are necessary to calculate the forced response of the blades for given mean values
    and standard deviations of the system parameters. To reduce the computational
    time, an approximate method has been developed and extended for small and moderate
    standard deviations of the system parameters to calculate the distribution and
    the envelopes of the frequency response functions for statistically varying system
    parameters, in the following called statistical mistuning. The approximate method
    is based on a sensitivity analysis and the assumption of a Weibull distribution
    of the vibration amplitudes of the blades. Both, the approximate method and the
    assumption of a Weibull distribution of the vibration amplitudes are validated
    by Monte-Carlo simulations. By these investigations the influence of different
    arrangements of the system parameters for given mean values and standard deviations
    of the vibration amplitudes of the blades can be determined, too. For the present
    investigations only a small influence of the arrangement of blades with respect
    to their natural frequencies has been observed. On the other hand, an intentional
    mistuning of the damper masses and the natural frequencies of the blades in a
    systematic way, in the following called systematic mistuning, can be investigated
    to reduce the amplitudes of the system. The simulation results of a systematic
    mistuning has been validated by a test rig with a rotating bladed disk assembly
    with friction dampers. The investigations show a good agreement between the simulations
    and the measurements but only a slight decrease of the maximum amplitudes in case
    of a systematic mistuning. Copyright {\copyright} 2004 by ASME@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Florian
      foaf_name: Götting, Florian
      foaf_surname: Götting
  - foaf_Person:
      foaf_givenName: Walter
      foaf_name: Sextro, Walter
      foaf_surname: Sextro
      foaf_workInfoHomepage: http://www.librecat.org/personId=21220
  - foaf_Person:
      foaf_givenName: Lars
      foaf_name: Panning, Lars
      foaf_surname: Panning
  - foaf_Person:
      foaf_givenName: Karl
      foaf_name: Popp, Karl
      foaf_surname: Popp
  bibo_issue: GT2004-53310
  bibo_volume: 6
  dct_date: 2004^xs_gYear
  dct_language: eng
  dct_subject:
  - Friction
  - Disks
  dct_title: Systematic mistuning of bladed disk assemblies with friction contacts@
...