Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
510629 | Computers & Structures | 2013 | 10 Pages |
This paper improves the eigenpair approximations obtained from the automated multilevel substructuring (AMLS) method by subspace iterations. Two variants of AMLS hybrid Subspace Iteration Method (AMLS-SIMa and AMLS-SIMb) are proposed. AMLS-SIMa is a derivative of the basic subspace iteration by utilizing the AMLS approximations as initial vectors. AMLS-SIMb further takes advantage of the AMLS transformed block diagonal stiffness matrix to avoid factorization of the original stiffness matrix. Numerical experiments show that: (a) the error of AMLS approximate eigenpairs can be significantly reduced with just a few iteration steps; (b) AMLS-SIMb is more efficient than AMLS-SIMa with less execution time.
► The error of AMLS eigenvector approximations is reported. ► Two subspace iteration methods (AMLS-SIMa and AMLS-SIMb) are proposed to improve the standard AMLS. ► The error of AMLS eigenvector approximations is greatly reduced with a few subspace iterations. ► AMLS-SIMb is more efficient than AMLS-SIMa with less execution time. ► AMLS-SIMa and AMLS-SIMb are compared with the basic subspace iteration method (BSIM) and an improve subspace iteration method (ISIM).