学术报告-黄正达

学术报告


题      目:A two-parameter shift-splitting preconditioner for saddle point problems


报  告  人:黄正达   教授  (邀请人:黎稳 )

                                    浙江大学


时      间:5月25日  16:00-17:00


地     点:数学科学学院东楼401


报告人简介:

       黄正达,浙江大学数学科学学院教授,计算数学专业博士生导师,获学校永平教学贡献提名奖,2021年宝钢优秀教师奖,2021年浙江省优秀教学成果一等奖(参与),浙江大学数学公共基础课程教学研究中心常务副主任。有兴趣于非线性方程(组)求解的Newton型迭代方法及数值优化理论中相关方法的研究、鞍点问题基于系数矩阵分裂的方法和线性方程组Kaczmarz型求解方法的研究、以及相应方法在求解偏微分方程和CAD中的应用研究。


摘      要:

       For saddle point problems, a two-parameter shift-splitting (TPSS) preconditioner is proposed. Estimated lower and upper bounds of the real eigenvalues and the real and imaginary parts of the non-real eigenvalues of the TPSS preconditioned matrix are obtained, respectively. As special cases, bounds obtained are tighter than the ones for the GSS, PGSS, IGSS and NESS preconditioners, respectively. Meanwhile, the corresponding TPSS iteration method is constructed and the convergence analysis is studied. Numerical experiments for two frequently used problems are given to illustrate the great robustness of the TPSS preconditioner.