A simultaneous iterative procedure for the fixed-interface component modal synthesis (CMS) method is developed in this paper toward fast calculating the modal parameters and ROM of a large-scale and/or complicated structure. Different from the existing iterative fixed-interface CMS methods, in the proposed iterative scheme, an eigenvalue independent matrix, whose column projections in the exact reduced space are the interested global eigenvectors, is chosen as the iterative term and then used as a Ritz basis to generate the reduced system matrices. Consequently, all the interested modes can be solved simultaneously and a ROM can be derived after one round of iterations. For reference, an implementation is given together with some computational considerations. Compared with other methods for solving modal parameters and/or model order reduction, the proposed method has such merits as high computational efficiency, especially for reanalysis tasks and parallel programming. A numerical example is provided to illustrate and validate the proposed method.

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