Vibration reanalysis based on block combined approximations with shifting
An efficient method is proposed for vibration reanalysis. Block combined approximations with shifting is used to simultaneously calculate some eigenpairs. The proposed method is based on matrixmatrix operations with Level-3 BLAS. The triangular factorizations of shifted matrices generated in original vibration analysis are utilized. No factorization of the modified stiffness matrix is needed.
vibration reanalysis block combined approximations shifting computational efficiency