基于形状导数和水平基函数的复合材料层合结构拓扑优化
Topological optimization of composite laminated structure with shape derivative and level set
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摘要: 首次利用水平基物质分布函数推出域内积分与边界积分泛函的形状导数 , 建立了复合材料刚性连续结构拓扑优化设计理论的新模型。通过将形状导数和增广的 Lagrangian 乘子法相结合 , 提出了复合材料结构拓扑优化敏度分析的新方法。设计边界的进化是通过人为掌握目标函数下降的速度来控制。水平基函数的曲面在不改变拓扑结构的前提下上下运动 , 从而通过边界的合并与分离改变嵌入其中的零水平基面上设计构件的拓扑结果。广泛的 2D复合材料悬臂梁研究验证了本文中方法的有效性。Abstract: The shape derivatives of the functional for domain integral and boundary integral were derived in details by employing the material distribution function of the level set . A theoretical model of the stiff continuum structure for the composite laminated structure was established. By the combination of the shape derivative and the augmented Lagrangian multipliers , a novel sensitivity analysis for the mean compliance with the composite laminated structure was presented. The evolution of the structural design boundary was cont rolled by the artificial velocity which makes the objective function descent . The level set surface of a higher-dimensional function can be moved up and down without changing its topology structure , and the optimization boundaries embedded on level set function can automatically modify the topology structure by the boundaries merging and breaking. The extensively studied 2D examples of the clamped beam were employed to demonst rate the validity of the present methodologies.