arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math-ph/0410024math-phmath.MP
收藏

离散力学中的差分离散变分原理与辛算法

Difference Discrete Variational Principle in Discrete Mechanics and Symplectic Algorithm

Xu-Dong Luo, Han-Ying Guo, Yu-Qi Li, Ke Wu

摘要:

基于本文建立的非对易微分学,提出了离散力学中的差分离散变分原理和有限时间内变步长辛算法。这种方法保持了辛性和能量守恒离散。我们证明了在这些离散系统中存在离散形式的欧拉-拉格朗日上同调。我们还讨论了有限长时间内解的存在性及其在连续极限下的位置密度,并将我们的方法应用于具有周期扰动的单摆。数值结果是令人满意的。

英文摘要:

We propose the difference discrete variational principle in discrete mechanics and symplectic algorithm with variable step-length of time in finite duration based upon a noncommutative differential calculus established in this paper. This approach keeps both symplicticity and energy conservation discretely. We show that there exists the discrete version of the Euler-Lagrange cohomology in these discrete systems. We also discuss the solution existence in finite time-length and its site density in continuous limit, and apply our approach to the pendulum with periodic perturbation. The numerical results are satisfactory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑