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

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Abstract
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.
Authors

Associate Professor

Janko Slavič, PhD

  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  janko.slavic@fs.uni-lj.si
  +386 1 4771 226
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Professor

Miha Boltežar, PhD

  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  miha.boltezar@fs.uni-lj.si
  +386 1 4771 608
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