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When the Poisson matrix of Poisson system is non-constant, classical symplectic methods, such as symplectic Runge-Kutta method, generating function method, cannot preserve the Poisson structure. The non-constant Poisson structure was transformed into the symplectic structure by the nonlinear transform.Arbitrary order symplectic method was applied to the transformed Poisson system. The Euler equation of the free rigid body problem was transformed into the symplectic structure and computed by the midpoint scheme. Numerical results show the effectiveness of the nonlinear transform. 相似文献
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SYMPLECTIC SCHEMES FOR NONAUTONOMOUS HAMILTONIAN SYSTEM 总被引:3,自引:0,他引:3
秦孟兆 《应用数学学报(英文版)》1996,12(3):284-288
SYMPLECTICSCHEMESFORNONAUTONOMOUS HAMILTONIAN SYSTEMQINMENGZHAO(秦孟兆)(InstitateofComputationalMathematicsandScientific-Enginee... 相似文献
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拟线性Burgers方程在空间离散后转化成常微分方程,再用指数积分方法求解.数值结果表明指数积分法有显式稳定性,有相应Runge-Kutta方法相同的精度. 相似文献
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Householder 在[1]中详细讨论过 M 类矩阵.本文不用几何上的凸体概念,而用 Young所引入的 L 模来讨论 M 类矩阵,给出一个 M 类矩阵充分条件的较为简单的新证明.同时,若A 是 M 类矩阵,给出了一类具体的非奇异矩阵 L,使得‖A‖L=■(A).但我们未能找到使得‖A‖L=■(A)的通解 L.然后用 M 类矩阵来讨论差分格式稳定性问题,给出了一个比较一般的实用的稳定性充分条件. 相似文献
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一类演化方程的三个基本守恒律 总被引:2,自引:0,他引:2
“Soliton”的发现是当代数学物理的一大进展,它和与此有关的散射反演方法之产生,对非线性方程求解起了很大的推动作用。具Soliton解之系统的特点之一是存在无穷多个守恒律,多年来人们认为无穷多个守恒律的存在乃是孤子解存在的必要条件,无论对经典力学还是量子力学,守恒律的存在反映了系统对称性,且对称性比守恒律更为普遍。所 相似文献
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1. IntroductionIn recent yearss there has been a great interest in constructing numerical integrationschemes for ODEs in such a way that some qualitative geometrical properties of the solutionof the ODEs are exactly preserved. R.th[ll and Feng Kang[2'31 has proposed symplectic algorithms for Hamiltollian systems, and since then st ruct ure s- preserving me t ho ds fordynamical systems have been systematically developed[4--7]. The symplectic algorithms forHamiltonian systems, the volume-pre… 相似文献