Abstract
AbstractWe consider curves $$\gamma : [0, 1]\rightarrow {\mathbb {R}}^3$$
γ
:
[
0
,
1
]
→
R
3
endowed with an adapted orthonormal frame $$r: [0, 1]\rightarrow SO(3)$$
r
:
[
0
,
1
]
→
S
O
(
3
)
. We wish to deform such framed curves $$(\gamma , r)$$
(
γ
,
r
)
while preserving two contraints: a local constraint prescribing one of its ‘curvatures’ (i.e., off-diagonal elements of $$r'r^T$$
r
′
r
T
), and a global constraint prescribing the initial and terminal values of $$\gamma $$
γ
and r. We proceed in two stages. First we deform the frame r in a way that is naturally compatible with the constraints on r, by interpreting the local constraint in terms of parallel transport on the sphere. This provides a link to the differential geometry of surfaces. The deformation of the base curve $$\gamma $$
γ
is achieved in a second step, by means of a suitable reparametrization of the frame. We illustrate this deformation procedure by providing some applications: first, we characterize the boundary conditions on $$(\gamma , r)$$
(
γ
,
r
)
that are accessible without violating the local constraint; then, we provide a short proof of a smooth approximation result for framed curves satisfying both the differential and the global constraints. Finally, we also apply these ideas to elastic ribbons with nonzero width.
Funder
Technische Universität Dresden
Publisher
Springer Science and Business Media LLC
Subject
Applied Mathematics,General Engineering,Modeling and Simulation
Cited by
1 articles.
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