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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Optimal Design of a Shape Memory Alloy Actuated Composite Structure with Iterative Finite Element Analysis
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Optimal Design of a Shape Memory Alloy Actuated Composite Structure with Iterative Finite Element Analysis

机译：形状记忆合金驱动复合结构的迭代有限元优化设计

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摘要

A method is described for solving an inverse design problem to find the unassembled, stress-free component shapes of a structure that is integrally actuated with shape memory alloy (SMA) actuators. Morphing and multifunctional structures are of interest in the aerospace industry because of the potential for improving structural and aerodynamic performance across multiple operating conditions. The focus of this work is on structures that are morphed with SMA flexural actuators. For the case where the geometry is known for the unassembled components, assembly can be simulated to find the assembled shapes of the morphing structure. In the usual design case, however, only the desired shapes as assembled are known in multiple actuation states, and the corresponding unassembled shapes must be determined by an iterative solution process. An iterative finite element analysis approach to this problem is reported here. First an initial guess for the unassembled shapes is made and assembly is simulated with the finite element method. The resulting shapes are found for both SMA phases and compared with the desired shapes. A gradient-based optimization method is employed to update the initial geometry and iteration continues until the desired shapes are achieved. A simplified method of modeling the SMA material behavior is used for computational efficiently. It is found that this approach provides a practical way to solve the inverse design problem for structures that are integrally actuated with SMA material.
机译：描述了一种解决逆设计问题的方法，以找到由形状记忆合金（SMA）致动器整体致动的结构的未组装，无应力的部件形状。变形和多功能结构在航空航天工业中很受关注，因为它有可能在多种运行条件下改善结构和空气动力性能。这项工作的重点是用SMA挠曲执行器变形的结构。对于未组装组件的几何形状已知的情况，可以模拟组装以找到变形结构的组装形状。然而，在通常的设计情况下，在多个致动状态下只有已知的组装形状是已知的，并且相应的未组装形状必须通过迭代求解过程来确定。在此报告了一种迭代有限元分析方法。首先，对未组装的形状进行初步猜测，并使用有限元方法模拟组装。找到了两种SMA相的最终形状，并将其与所需形状进行比较。采用基于梯度的优化方法来更新初始几何形状，并继续进行迭代，直到获得所需的形状为止。对SMA材料行为进行建模的简化方法可有效地进行计算。发现该方法为解决由SMA材料整体致动的结构的逆设计问题提供了实用的方法。

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