The vector form intrinsic finite element method （VFIFE） is suitable for analyzing and simulating the large deformation, nonlinear or discontinuous mechanical behaviors of the flexible structures effectively, without assembling the global stiffness matrix. As for that, the modal parameters cannot be solved by eigenvalues directly. In this paper, referring to the stochastic subspace identification （SSI）, the covariance based stochastic subspace Identification program （VFIFE-SSI） is nested in the VFIFE solver. The modal analyses of the twin-cable network and the different cables network VFIFE models are carried out respectively, and the modal frequencies, damping ratios and mode shapes of the cable network are obtained. The accuracy of the VFIFE-SSI method is verified by comparing the results of the analytical solution with the traditional finite element analysis results. Meanwhile, the results show that the stiffness and damping coefficient of the cross-ties will influence the modal parameters of the cable network, and the overall performance of the cable network can be adjusted by varying the cross-tie parameters in engineering.
Key words
vector form intrinsic finite element（VFIFE） /
stochastic subspace identification（SSI） /
modal analysis /
cable network
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