Laboratory for Dynamics of Machines and Structures
Enhanced identification of damping using continuous wavelet transform
J. Slavič and
M. Boltežar
Journal of Mech Eng., 2002, Vol 48, Issue 11, 621-631
A continuous wavelet transform (CWT) based
on the Gabor wavelet function is used to identify the damping of a
multi-degree-of-freedom system. The basic procedures are already
known, especially the identification with a Morlet CWT. This study
enhances the already known procedures in sense of reducing the
edge-effect. This makes it possible to identify the damping of
high frequency modes. Three method are shown: reduced time spread
of the wavelet function method, equivalent window area method and
the reflected window method. The procedures are demonstrated on
signals acquired from the lateral vibration of a uniform beam. We
were able to identify the damping up to the 6th natural frequency.
  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  janko.slavic@fs.uni-lj.si
  +386 1 4771 226 jankoslavic    jankoslavic