NDLI: System Identification of Jack-Up Platform by Spectral Analysis

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wang, X. M. Koh, C. G. Thanh, T. N. Zhang, J.
Copyright Year	2010
Abstract	For the purpose of structural health monitoring (SHM), it is beneficial to develop a robust and accurate numerical strategy so as to identify key parameters of offshore structures. In this regard, it is difficult to use time-domain methods as the time history of wave load is not available unless output-only methods can be developed. Alternatively, spectral analysis widely used in offshore engineering to predict structural responses due to random wave conditions can be used. Thus the power spectral density (PSD) of structural response may be more appropriate than time history of structural responses in defining the objective (fitness) function for system identification of offshore structures. By minimizing PSD differences between measurements and simulations, the proposed numerical strategy is completely carried out in frequency domain, which can avoid inherent problems rising from random phase angles and unknown initial conditions in time domain. A jack-up platform is studied in the numerical study. A search space reduction method (SSRM) incorporating the use of genetic algorithms (GA) as well as a substructure approach are adopted to improve the accuracy and efficiency of identification. As a result, the stiffness parameters of jack-up legs can be well identified even under fairly noisy conditions.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	411
Ending Page	420
Page Count	10
File Format	PDF
ISBN	9780791849095
DOI	10.1115/OMAE2010-20627
e-ISBN	9780791838730
Volume Number	29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 1
Conference Proceedings	ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2010-06-06
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Spectroscopy Emission spectroscopy Structural response analysis Offshore structures Spectral energy distribution Structural health monitoring Waves Stress Genetic algorithms Simulation Ocean engineering Stiffness Engineering simulation Jack-up drilling rigs
Content Type	Text
Resource Type	Article

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