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Application of EMD-Based TVAR Model for Modal Analysis of Semi-submersibles

Liew, M. S. and Parman, Setyamartana and Kurian, V.J. and Yazid, Edwar (2013) Application of EMD-Based TVAR Model for Modal Analysis of Semi-submersibles. [Citation Index Journal]

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Abstract

This paper presents a technique for using a parametric approach for modal properties estimation of a floating offshore structure. The technique utilizes empirical mode decomposition (EMD)-based time-varying autoregressive (TVAR) model, which is an extended form of the well-known AR model. Input for TVAR model is surge motion as system response, obtained experimentally from a scaled 1:40 model of a prototype semi-submersible. By utilizing the advantage of time-varying spectrum generated from TVAR model, estimation of the modal properties is carried out in the time-frequency plane via poles technique under different random wave spectrum. The results show that the modal frequency and its corresponding damping ratio for surge motion either in low frequency or wave frequency region can be estimated well. The Stochastic subspace identification method and free-decay test of the semi-submersible prototype are taken as benchmark.

Item Type:Citation Index Journal
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Academic Subject One:Academic Department - Civil Engineering - Water and environment - Water
Departments / MOR / COE:Departments > Civil Engineering
ID Code:10812
Deposited By: Dr Mohd Shahir Liew
Deposited On:16 Dec 2013 23:48
Last Modified:16 Dec 2013 23:48

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