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http://dx.doi.org/10.12989/sem.2011.37.2.131

Application of joint time-frequency distribution for estimation of time-varying modal damping ratio  

Bucher, H. (Department of Civil Engineering, COPPE/Federal University of Rio de Janeiro)
Magluta, C. (Department of Civil Engineering, COPPE/Federal University of Rio de Janeiro)
Mansur, W.J. (Department of Civil Engineering, COPPE/Federal University of Rio de Janeiro)
Publication Information
Structural Engineering and Mechanics / v.37, no.2, 2011 , pp. 131-147 More about this Journal
Abstract
The logarithmic decrement method has been long used to estimate damping ratios in systems with only one modal component such as linear single degree of freedom (SDOF) mechanical systems. This paper presents an application of a methodology that uses joint time-frequency distribution (JTFD) as input, instead of the raw signal, to systems with several vibration modes. A most important feature of the present approach is that it can be applied to a system with time-varying damping ratio. Initially the precision and robustness of the method is determined using a synthetic model with multiple harmonic components, one of them displaying a time-varying damping ratio, subsequently the results obtained from experiments with a reduced model are presented. A comparison is made between the results obtained with this methodology and those using the classical technique of Least Squares Complex Exponential Method (LSCE) in order to highlight the advantages of the former, such as, good precision, robustness and excellent performance in extreme cases, e.g., when very low frequency components and time varying damping ratio are present.
Keywords
damping; modal damping; joint time-frequency distribution (JTFD); least squares complex exponential method (LSCE);
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
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