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arXiv 2102.12778math.NAcs.NAmath.DS
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力学系统的李群积分器

Lie Group integrators for mechanical systems

Elena Celledoni, Ergys Çokaj, Andrea Leone, Davide Murari, Brynjulf Owren

摘要:

自20世纪90年代引入以来,李群积分器已成为许多应用领域的首选方法。这些包括多体动力学,形状分析,数据科学,图像配准和生物物理模拟。两类重要的内禀李群积分器是Runge-Kutta-Munthe-Kaas方法和无换位子的李群积分器。我们对这些类的方法做一个简短的介绍。哈密顿框架是有吸引力的许多力学问题,特别是我们将考虑李群积分的余切丛的李群,其中一些不同的配方是可能的问题。在这样的流形上有一个自然的辛结构,通过变分原理可以导出辛李群积分器。我们还考虑了实现李群积分器的实际方面,例如自适应时间步进。该理论说明了两个非平凡的应用力学的方法。一个是N重球摆,其中我们引入了群$SE(3)$对二维球的切丛$TS^2$的伴随作用的限制。最后,我们展示了如何李群积分器可以应用到模拟的有效载荷被两个转子运输的控制路径。这个问题是仿照$\mathbb{R}^6\times \left(SO(3)\times \mathfrak{so}(3)\right)^2\times (TS^2)^2$和把在一个格式,其中李群积分器可以应用。

英文摘要:

Since they were introduced in the 1990s, Lie group integrators have become a method of choice in many application areas. These include multibody dynamics, shape analysis, data science, image registration and biophysical simulations. Two important classes of intrinsic Lie group integrators are the Runge--Kutta--Munthe--Kaas methods and the commutator free Lie group integrators. We give a short introduction to these classes of methods. The Hamiltonian framework is attractive for many mechanical problems, and in particular we shall consider Lie group integrators for problems on cotangent bundles of Lie groups where a number of different formulations are possible. There is a natural symplectic structure on such manifolds and through variational principles one may derive symplectic Lie group integrators. We also consider the practical aspects of the implementation of Lie group integrators, such as adaptive time stepping. The theory is illustrated by applying the methods to two nontrivial applications in mechanics. One is the N-fold spherical pendulum where we introduce the restriction of the adjoint action of the group $SE(3)$ to $TS^2$, the tangent bundle of the two-dimensional sphere. Finally, we show how Lie group integrators can be applied to model the controlled path of a payload being transported by two rotors. This problem is modeled on $\mathbb{R}^6\times \left(SO(3)\times \mathfrak{so}(3)\right)^2\times (TS^2)^2$ and put in a format where Lie group integrators can be applied.

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