精化策略 meaning in English

refinement strategy

To some eigenproblems , the corresponding ritz vectors always converge very slowly even sometimes do n ' t converge when ritz values have converged . so in order to improve the convergence of ritz vectors , firstly , refining - strategy is applied to the davidson method in this paper . the process restarts with the refined ritz vectors as the initial vectors , and then we get the refined block davidson method
为了改善ritz向量的收敛性，本文首先在块davidson方法的执行过程中，运用精化策略，求出相应的精化向量并将其作为初始向量进行重新开始过程，由此得到了精化块davidson方法，并对精化块davidson方法进行了收敛性分析；其次，本文将精化块davidson方法结合收缩技术，提出了收缩的精化块davidson方法。