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arXiv 0709.1463math.NAcs.NAmath-phmath.DGmath.MP
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非完整动力学中的动量与能量保持积分器

Momentum and energy preserving integrators for nonholonomic dynamics

Instituto de Ciencias Matemáticas (CSIC-UAM-UC3M-UCM)(数学科学研究院(CSIC-UAM-UC3M-UCM))

S. Ferraro, D. Iglesias, D. Martín de Diego

AI总结:

本文提出一种用于非完整力学系统的几何积分器,通过离散拉格朗日量和非完整约束的离散化,保持离散非完整动量映射并平均保持约束,在特殊情况下还保持能量。

摘要:

本文提出了一种用于非完整力学系统的几何积分器。它可应用于通过定义在QxQ上的离散拉格朗日量(其中Q是构型流形)和TQ中的(通常不可积)分布所指定的离散拉格朗日系统。在所提出的方法中,不需要对约束进行离散化。我们证明了该方法保持离散非完整动量映射,并且非完整约束在平均意义下被保持。我们特别研究了Q具有李群结构且离散拉格朗日量和/或非完整约束具有各种不变性的情况,并证明了该方法在一些重要情况下也保持能量。

英文摘要:

In this paper, we propose a geometric integrator for nonholonomic mechanical systems. It can be applied to discrete Lagrangian systems specified through a discrete Lagrangian defined on QxQ, where Q is the configuration manifold, and a (generally nonintegrable) distribution in TQ. In the proposed method, a discretization of the constraints is not required. We show that the method preserves the discrete nonholonomic momentum map, and also that the nonholonomic constraints are preserved in average. We study in particular the case where Q has a Lie group structure and the discrete Lagrangian and/or nonholonomic constraints have various invariance properties, and show that the method is also energy-preserving in some important cases.

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。

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