Publications

Liu. Ka., Yan, R-J. and Guedes Soares, C. (2018), “An improved model updating technique based on modal data”, Ocean Engineering, Vol. 154, pp. 277-287

An improved technique of model updating based on extracted modal data is presented. To avoid a rank deficient problem and a biased solution of the derived linear equations, this method changes the form of the coefficient matrix and adds more independent equations to the original method and truncated singular value decomposition is utilized for possible solution with physical understanding. Results of two numerical investigations, including model updating of a simply-supported beam and damage detection on a jacket platform, indicate better accuracy and stability of the proposed technique. A comparative rank study reveals that this improved technique handles more unknowns with same amount of extracted modes. Several damage cases are considered with modal data contaminated by noise. Results affected by noise level, extracted mode combinations, and damage cases are discussed. Monte Carlo simulations show that with mode shapes contaminated even with 3% added noise, one could still be able to obtain satisfactory results.

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