Publications

Liu. Ka.,Yan, R-J. e Guedes Soares, C. (2018), “Damage identification in offshore jacket structures based on modal flexibility”, Ocean Engineering, Vol. 170, pp. 171-185

A modal flexibility-based method using finite element model updating technique is presented for damage detection on a jacket-platform. The motivation for choosing modal flexibility is studied and the objective function for an iterative optimization process is formulated. The simulated platform FE model is established with single and triple damage cases where noise contamination and model uncertainty are considered simultaneously. Monte Carlo simulation is used for random parameter study to obtain statistic conclusions. A substructure optimization algorithm is proposed to lower the number of design variables. The highlight is that when the flexibility-based method employs only the first order modal parameter and translational degree of freedoms, the satisfactory results can still be derived with high level of contaminated noise and random errors on elemental elasticity modulus and mass density. The influence by random parameters are discussed with several important conclusions being summarized. The proposed substructure optimization algorithm and crucial problems during optimization process are well described. The algorithm is applied to two numerical examples including a simply-supported beam and a jacket-platform, the study based on equivalent model reveals better accuracy and efficiency of the proposed algorithm, satisfactory results are concluded again even with 3% measurement noise and model uncertainty.

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