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求解结构动力学方程的一种辛格式及其优化

A Symplectic Method for Structural Dynamics
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摘要 论文将四阶隐式高斯勒让德辛龙格库塔法应用于线性结构动力学方程,并对其进行了算法优化.针对n个自由度的动力学初值问题,先通过消元得到n阶线性代数方程组,利用其系数矩阵稀疏对称正定的性质,采用预处理共轭梯度法求解,其中预条件子由系数矩阵的不完全Cholesky分解得到.通过与中心差分法、Newmark-β法及Runge-Kutta法相比,论文方法在计算量未显著增加的前提下给出了更高的计算精度. An efficient implementation of the symplectic implicit Gauss-Legendre Rugge-Kutta method of 4th order was presented.For the n degrees freedom dynamical system,we use the preconditioned conjugate gradient method to solve algebraic equations.Compared with traditional methods,the symplectic method show great advantages in stability and precision.
机构地区 中山大学工学院
出处 《固体力学学报》 CAS CSCD 北大核心 2016年第S1期45-49,共5页 Chinese Journal of Solid Mechanics
基金 国家自然科学基金项目(11172334) 国家自然科学基金青年科学基金(11202247) 中央高校基本科研业务费专项资金(2013390003161292)资助
关键词 动力学初值问题 辛算法 预处理共轭梯度法 structural dynamics symplectic methods the preconditioned conjugate gradient method
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