Evaluation of Damping Using Time Domain OMA Techniques

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The prevailing Operational Modal Analysis (OMA) techniques provide in most cases reasonably accurate estimates of structural frequencies and mode shapes. In contrast though, they are known to often produce poor structural damping estimates, which is mainly due to inherent random and/or bias errors. In this paper a comparison is made of the effectiveness of three existing OMA techniques in providing accurate damping estimates for varying loadings, levels of noise, number of added measurement channels and structural damping. The evaluated techniques are derived in the time domain and are namely the Ibrahim Time Domain (ITD), Eigenvalue Realization Algorithm (ERA) and the Polyreference Time Domain (PTD). The response of a two degree-of-freedom (2DOF) system is numerically established from specified modal parameters with well separated and closely spaced modes. Two types of response are considered, free response and random response from white noise loading. Finally, the results of the numerical study are presented, in which the error of the structural damping estimates obtained by each OMA technique is shown for a range of damping levels. From this, it is clear that there are notable differences in accuracy between the different techniques.
Original languageEnglish
Title of host publicationProceedings of 2014 SEM Fall Conference and International Symposium on Intensive Loading and Its Effects
Number of pages6
PublisherSociety for Experimental Mechanics, Inc.
Publication date2014
Publication statusPublished - 2014
Event2014 SEM Fall Conference and International Symposium on Intensive Loading and Its Effects - The Friendship Hotel, Beijing, China
Duration: 19 Oct 201422 Oct 2014
Conference number: 1
http://sem.org/CONF-FALL-TOP.asp

Conference

Conference2014 SEM Fall Conference and International Symposium on Intensive Loading and Its Effects
Number1
LocationThe Friendship Hotel
CountryChina
CityBeijing
Period19/10/201422/10/2014
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    Research areas

  • Operational Modal Analysis, Structural damping, Ibrahim Time Domain, Eigenvalue Realization Algorithm, Polyreference Time Domain, Closely spaced modes

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