?????????????????????Krylov?????????

提出了一种新的精细时程积分法来求解大型动力系统. 结合Krylov子空间法、培德级数近似以及一般载荷的维数扩展法，进一步提高精细时程积分法的计算效率. 利用维数扩展法避免计算微分方程特解，并可处理任意载荷. 对于大型动力系统，通过Krylov子空间的降维分析将问题转化到一个子空间，计算效率得到极大提高. 对于迭代次数$N$的选择作了详细讨论，进一步提高了计算效率.

KRYLOV PRECISE TIME-STEP INTEGRATION ALGORITHM FOR LARGE-SCALE STRUCTURE DYNAMIC EQUATION

An efficient precise time-step integration algorithm tosolve large-scale transient problems is presented. The Krylov subspacemethod, the Pad'{e} approximations and the dimensional expanding method ofordinary excitations are applied to modify the original precise time-stepintegration algorithm in order to improve the computational efficiency. Theproblems of arbitrary complex excitations can also be solved. For a large-scale system,the efficiency of the algorithm would be influenced because the dimension ofsystem extended by the dimension expanding method becomes higher,especially, forthe complex excitations. The present algorithm can solve the large-scale systemwithout difficulty by using the decreasing dimension analysis of the Krylovsubspace method. The efficiency of the new algorithm can be improved byanalyzing the exponentional matrix in a subspace instead of the originallarge space. More computational cost can be saved by selecting the parameter$N$ carefully.