Difference Discrete Variational Principle in Discrete Mechanics and Symplectic Algorithm

Details Difference Discrete Variational Principle in Discrete Mechanics and Symplectic Algorithm Difference Discrete Variational Principle in Discrete Mechanics and Symplectic Algorithm

2004-10-08

arxiv.org/abs/math-ph/0410024v1

Comm. Theor. Phys., 42, 443-452, (2004)

Physics

Mathematical Physics

18 pages, 3 figures

Scientific paper

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.

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