[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.12989/sss.2015.15.1.081

Blind modal identification of output-only non-proportionally-damped structures by time-frequency complex independent component analysis

Nagarajaiah, Satish (Department of Civil and Environmental Engineering and Department of Mechanical Engineering, Rice Univ.)
Yang, Yongchao (Department of Civil and Environmental Engineering, Rice Univ.)

Publication Information

Smart Structures and Systems / v.15, no.1, 2015 , pp. 81-97 More about this Journal

Abstract

Recently, a new output-only modal identification method based on time-frequency independent component analysis (ICA) has been developed by the authors and shown to be useful for even highly-damped structures. In many cases, it is of interest to identify the complex modes of structures with non-proportional damping. This study extends the time-frequency ICA based method to a complex ICA formulation for output-only modal identification of non-proportionally-damped structures. The connection is established between complex ICA model and the complex-valued modal expansion with sparse time-frequency representation, thereby blindly separating the measured structural responses into the complex mode matrix and complex-valued modal responses. Numerical simulation on a non-proportionally-damped system, laboratory experiment on a highly-damped three-story frame, and a real-world highly-damped base-isolated structure identification example demonstrate the capability of the time-frequency complex ICA method for identification of structures with complex modes in a straightforward and efficient manner.

Keywords

output-only modal identification; complex modes; non-proportional damping; blind source separation; complex independent component analysis; time-frequency analysis;

Citations & Related Records

Reference

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