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Morlet-wave-based modal identification in the time domain [Elektronski vir]Tomac, Ivan ; Slavič, Janko, 1978-This research focuses on the time-domain identification of modal parameters using impact response excitation from signals with a relatively small dynamic range and high noise contamination (e.g., ... from high-speed cameras). The information required to identify the modal parameters is limited and is contained mostly at the beginning of the signal. In order to perform an identification from such a response, the following challenges have to be overcome: a good frequency-domain separation (for close modes), a good localization in the time domain and an over-determination (to reduce uncertainty). To overcome these challenges this research introduces the Morlet-wave modal identification method as an extension of the Morlet-wave damping identification method, which has already proven capable of identifying the damping of short signals. Here, the method is extended to the modal parameters and an over-determination approach is proposed to reduce the uncertainty. The method identifies each mode shape separately from 10 to a maximum of 400 oscillations and at damping levels from 0.02% to 2% with a strong presence of noise in the signal. The method is tested on an experimental example and the results are compared to the classical modal identification methodology.Source: Mechanical systems and signal processing [Elektronski vir]. - ISSN 1096-1216 (Vol. 192, Jun. 2023, str. 1-11)Type of material - e-article ; adult, seriousPublish date - 2023Language - englishCOBISS.SI-ID - 144036355
Author
Tomac, Ivan |
Slavič, Janko, 1978-
Topics
Morletov valček |
modalna identifikacija |
modalni parametri |
predoločen sistem |
šum |
Morlet-wave |
modal identification |
modal parameters |
over-determination |
noise
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Database name | Field | Year |
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Tomac, Ivan | |
Slavič, Janko, 1978- | 23010 |
Source: Personal bibliographies
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