Abstract
Abstract In FE modeling of port crane structures, errors may be caused due to the simplification of complicated components, unclear physical properties, local approximation and inaccurate boundary conditions. So it is very important to update the FE model accuracy according to the experiment model and results. However there are two major problems when solving the model updating of port crane structure, the one is the difficulty of collecting the structure modal parameters with traditional modal experiment method because of the large scale of port crane structure, the other is mismatching problem while updating processing due to most of the model updating method currently constructing the objective function only by frequency. In this paper, an operational modal analysis is adopted to estimate the modal parameters of port crane structure based on the operational condition. A parametric model updating methodology of finite element (FE) model is proposed to solve port crane structure model updating: a series of design parameters of the FE model of port crane structure are selected as the main factors based on the sensitivity analysis, the objective function is built by considering the frequency correlation and the modal assurance criterion (MAC) together, and finally a zero-order/first-order combination algorithm is utilized to get the final accurate FE model of port crane structure. Research results showed that methodology proposed in this paper has satisfied updating accuracy for port crane structure, which verifies that the proposed method is suitable for model updating problem of this kind of structure.
Highlights
In FE modeling of port crane structures, errors may be caused due to the simpli cation of complicated components, unclear physical properties, local approximation and inaccurate boundary conditions
A parametric model updating methodology of nite element (FE) model is proposed to solve port crane structure model updating: a series of design parameters of the FE model of port crane structure are selected as the main factors based on the sensitivity analysis, the objective function is built by considering the frequency correlation and the modal assurance criterion (MAC) together, and nally a zero-order/ rst-order combination algorithm is utilized to get the nal accurate FE model of port crane structure
The modal parameters of port cranes are estimated by operational modal analysis, a multi-objective optimization model is constructed considered with frequency and MAC values together, the main factors of the physical parameters are determined by the sensitivity analysis, and the optimization model is minimized by the zero-order/ rst-order combination algorithm
Summary
Abstract: In FE modeling of port crane structures, errors may be caused due to the simpli cation of complicated components, unclear physical properties, local approximation and inaccurate boundary conditions. For large engineering structure such as a port crane, it is really di cult to excite the structure e ectively Usually it can’t getthe frequency response functions (FRFs) of the structure, which means it is impossible to estimate the system modal parameters by the traditional experimental modal analysis. The modal parameters of port cranes are estimated by operational modal analysis, a multi-objective optimization model is constructed considered with frequency and MAC values together, the main factors of the physical parameters are determined by the sensitivity analysis, and the optimization model is minimized by the zero-order/ rst-order combination algorithm
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