Shape morphing hinged truss structures
Shape morphing hinged truss structures
复制标题
形状变形铰接桁架结构
DOI：
10.1088/0964-1726/18/6/065012
复制
发表时间：
2009
影响因子：
4.1
通讯作者：
H. Wadley
中科院分区：
文献类型：
--
作者：
A. Sofla;D. Elzey;H. Wadley
在需要最小质量解的应用中，桁架结构被广泛用于支撑结构荷载。它们的节点通常被构造为抵抗旋转，以最大限度地提高其在负载下的刚度。最近提出了一种多连杆节点的概念，允许由这种节点连接的四面体桁架独立旋转。因此，可以通过在桁架机构内安装线性位移执行器来设计具有高权威性的变形桁架结构。给出了线性或平面形状的驱动结构的例子，并展示了它们弯曲、扭转和起伏的能力。利用单向形状记忆丝作动器构建了一种实验装置，该装置采用对抗性配置，允许可逆驱动结构。结果表明，采用机械放大设计后，驱动结构的位移响应得到显着放大。
Truss structures are widely used for the support of structural loads in applications where minimum mass solutions are required. Their nodes are normally constructed to resist rotation to maximize their stiffness under load. A multi-link node concept has recently been proposed that permits independent rotation of tetrahedral trusses linked by such a joint. High authority shape morphing truss structures can therefore be designed by the installation of linear displacement actuators within the truss mechanisms. Examples of actuated structures with either linear or planar shapes are presented and their ability to bend, twist and undulate is demonstrated. An experimental device has been constructed using one-way shape memory wire actuators in antagonistic configurations that permit reversible actuated structures. It is shown that the actuated structure displacement response is significantly amplified by use of a mechanically magnified design.