Variational integrators for forced Birkhoffian systems

Variational integrators for forced Birkhoffian systems
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强制伯克霍夫系统的变分积分器

DOI:
10.1016/j.amc.2013.09.045
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发表时间:
2013-12
影响因子:
4
通讯作者:
Mei Fengxiang
Mei Fengxiang
中科院分区:
数学2区
文献类型:
--
作者:
Kong Xinlei;Wu Huibin;Mei Fengxiang

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在这封信中,我们首先将Pfaff-Birkhoff原理推广到包含力,从而得到Pfaff-Birkhoff-D‘Alembert原理。那么,强迫Birkhoff系统的运动与修正原理的极值重合。随后,与连续情况相比,通过对Pfaff-Birkhoff-D‘Alembert原理的离散化,构造了离散的强迫Birkhoff方程。作为算法,离散方程在获得正确的能量在积分过程中的变化量方面具有良好的数值行为,通过给出的例子说明。
In this letter, we first extend the Pfaff–Birkhoff principle to include forces and obtain the Pfaff–Birkhoff–D’Alembert principle consequently. Well then motions of forced Birkhoffian systems coincide with extremals of the modified principle. Subsequently, compared with the continuous case, the discrete forced Birkhoffian equations are constructed by discretizing the Pfaff–Birkhoff–D’Alembert principle. Considered as algorithms, the discrete equations have good numerical behavior in terms of getting the correct amounts by which the energy changes over the integration process, demonstrated by the given example.
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