When Is a Helix Stable?

When Is a Helix Stable?
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螺旋何时稳定?

DOI:
10.1103/physrevlett.125.088001
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发表时间:
2020
影响因子:
8.6
通讯作者:
Bretl, Timothy
Bretl, Timothy
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Borum, Andy;Bretl, Timothy

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我们确定的各向同性基尔霍夫弹性杆的螺旋平衡与固定端是稳定的,是不稳定的。虽然所有的螺旋平衡集参数化的四个变量,与杆的材料确定的额外的第五个参数,我们表明,这五个参数中只有三个是需要区分稳定和不稳定的平衡。我们还证明了稳定平衡点集的闭包是星星凸的。有了这些结果,我们能够计算和可视化之间的边界稳定和不稳定的螺旋第一次。
We determine which helical equilibria of an isotropic Kirchhoff elastic rod with clamped ends are stable and which are unstable. Although the set of all helical equilibria is parametrized by four variables, with an additional fifth parameter determined by the rod’s material, we show that only three of these five parameters are needed to distinguish between stable and unstable equilibria. We also show that the closure of the set of stable equilibria is star convex. With these results, we are able to compute and visualize the boundary between stable and unstable helices for the first time.
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