Determination of modal parameters is one of the most important steps in a maintenance strategy and/or structure health monitoring of aging fixed offshore jacket platforms during service life. This paper presents a new Ensemble Empirical Mode Decomposition-Hilbert transform (EEMD-HT)-based analysis to identify natural frequencies of the offshore structures under an artificial and natural excitation. An EMD processing algorithm is used to decompose the vibration response signal into a set of intrinsic mode functions (IMFs) and the EEMD is developed from the EMD to solve the vibration mode mixing in identifying the natural frequencies of the structure. In this study, the experiment of vibration response measurement was conducted on the actual offshore structure at site for both the artificial and natural excitations. A numerical model in an Eigen value analysis was also simulated to evaluate the consistency with the experiment. The main results demonstrate that the instantaneous (time-dependent) frequencies of fixed offshore jacket platform were successfully identified by the EEMD-HT technique under both the artificial and ambient excitation.
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Trung, N.T. EEMD-HT transform for identifying modal parameters of fixed offshore jacket platforms using vibration response measurement. J Civil Struct Health Monit 10, 883–897 (2020). https://doi.org/10.1007/s13349-020-00422-3
- Fixed offshore jacket platform
- Natural instantaneous frequency
- Vibration response measurement