Faculty of Mechanical Engineering, Lj. (FSLJ)
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Damping identification with the morlet-waveSlavič, Janko, 1978- ; Boltežar, MihaIn the past decade damping-identification methods based on the continuous wavelet transform (CWT) have been shown to be some of the best methods for analyzing the damping of multi-degree-of-freedom ... systems. The CWT methods have proven themselves to be resistant to noise and able to identify damping at closely spaced natural frequencies. However, with the CWT-based techniques, the CWT needs to be obtained on a two-dimensional, time-frequency grid, and they are, therefore, computationally demanding. Furthermore, the CWT is susceptible to the edge effect, which causes a non-valid identification at the start and the end of the time-series. This study introduces a new method, called the Morlet-wave method, where a finite integral similar to the CWT is used for the identification of the viscous damping. Instead of obtaining the CWT on a two-dimensional grid, the finite integral needs to be calculated at one time-frequency point, only. Then using two different integration parameters, the damping ratio can be identified. A complete mathematical background of the new, Morlet-wave, damping-identification method is given and this results in a root-finding or a closed-form solution. The presented numerical experiments show that the new method has a similar performance to the CWT-based damping-identification methods, while the method is numerically, significantly less demanding, completely avoids the edge effect, and the procedure is straight forward to use.Source: Mechanical systems and signal processing. - ISSN 0888-3270 (Vol. 25, iss. 5, Jul. 2011, str. 1632-1645)Type of material - article, component partPublish date - 2011Language - englishCOBISS.SI-ID - 11720731
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source: Mechanical systems and signal processing. - ISSN 0888-3270 (Vol. 25, iss. 5, Jul. 2011, str. 1632-1645)
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Database name | Field | Year |
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Slavič, Janko, 1978- | 23010 |
Boltežar, Miha | 02034 |
Source: Personal bibliographies
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