Dynamic control for morphing of bi-stable composites
Dynamic control for morphing of bi-stable composites
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DOI：
10.1177/1045389x12449918
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发表时间：
2013-02-01
影响因子：
2.7
通讯作者：
Hagedorn, Peter
中科院分区：
文献类型：
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作者：
Arrieta, Andres F.;Bilgen, Onur;Hagedorn, Peter
自适应结构一直是许多研究的焦点，因为使用传统设计无法实现性能提升。在这种情况下，变形的想法有望在机动性、燃油效率和以最佳方式执行不同任务的能力方面增强能力。为了实现变形，需要能够在最小驱动下改变形状的材料。双稳定复合材料是一种具有两种静态稳定构型的复合材料结构。这种由锁定面内残余应力引起的双稳定特性引起了自适应结构界对变形结构的广泛关注，因为不需要驱动来保持每种稳定构型。稳定状态之间的变化在物理上被实现为跳跃现象或快照，这在本质上是强烈的非线性。已经研究了利用快速通过的变形策略，显示出令人鼓舞的初步结果。本文利用双稳态复合材料的动态响应作为增强变形控制驱动的一种手段。成功地开发了一种针对模态频率的变形策略，从而导致结构的卡通。这将通过诱导和反转所需的snap-through实现全状态配置控制。该策略在一个样品上进行了测试，使用Macro纤维复合材料作为智能执行器，验证了所提出的概念。
Adaptive structures have been the focus of much research due to performance gains not possible to achieve using conventional designs. Within this context, the idea of morphing promises augmented capabilities in terms of manoeuvrability, fuel efficiency and the ability to perform dissimilar tasks in an optimal manner. To achieve morphing, materials capable of changing shape requiring minimum actuation are necessary. Bi-stable composites are a type of composite structures which have two statically stable configurations. This bi-stability property, resulting from locked in-plane residual stresses, has attracted considerable attention from the adaptive structure community for morphing structures as actuation is no required to hold each stable configuration. The change between stable states is physically realised as a jump phenomenon or snap-through, which is strongly non-linear in nature. Morphing strategies exploiting snap-through have been studied showing encouraging preliminary results. This article exploits the dynamic response of bi-stable composites as a means of augmenting the actuation for morphing control. A morphing strategy targeting modal frequencies leading to snap-through of the structure is successfully developed. This results in a full-state configuration control by inducing and reversing snap-through as desired. The strategy is tested on a specimen using Macro Fiber Composites as smart actuators validating the proposed concept.