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首页> 外文期刊>Computers & Structures >Stacking sequence optimization of doubly-curved laminated composite shallow shells for maximum fundamental frequency by sequential permutation search algorithm
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Stacking sequence optimization of doubly-curved laminated composite shallow shells for maximum fundamental frequency by sequential permutation search algorithm

机译:顺序置换搜索算法堆叠双弯曲层压浅壳的堆叠序列优化,实现最大基频

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摘要

A sequential permutation search (SPS) optimization algorithm is proposed for the stacking sequence design of doubly-curved laminated composite shallow shells. The SPS algorithm takes advantages of the inherent physical-mechanical features of composite laminates that the outer layers contribute more than the inner layers to bending rigidity and the convexity of lamination parameters. In SPS, the linear and nonlinear sensitive detection techniques are introduced, which detect the sensitive ply orientation at a proper stacking position. By assigning identical ply orientation at respective stacking position, and designing the stacking sequence from the inner to the outer positions sequentially and iteratively using the sensitive ply orientation, the solution will converge to the optimum when no sensitive ply orientation can be detected at any stacking position. In addition, the bending-twisting coupling effects of the laminates are regulated by means of a sign optimization algorithm (SOA) coupled in SPS. The stacking sequences of doubly-curved laminated composite shallow shells exhibit various boundaries and geometries are optimized to maximize the fundamental frequency, and the Rayleigh-Ritz method is developed for vibration analysis. The optimal results are compared with those of layerwise optimization approach and genetic algorithm, demonstrating the robustness and efficiency of the SPS algorithm. (C) 2021 Elsevier Ltd. All rights reserved.
机译:提出了一种顺序置换搜索(SPS)优化算法,用于双弯曲层压浅壳的堆叠序列设计。 SPS算法利用复合层压板的固有物理机械特征的优点,即外层贡献的内层以弯曲刚度和层压参数的凸起。在SPS中,引入线性和非线性敏感检测技术,其检测在适当的堆叠位置处的敏感帘布层取向。通过在各自的堆叠位置处分配相同的帘布层方向,并使用敏感的帘布层方向依次和迭代地将堆叠序列从内部和迭代地设计,当在任何堆叠位置没有检测到敏感的帘布层取向时,溶液将会收敛到最佳状态。另外,通过在SPS中耦合的符号优化算法(SOA)来调节层压板的弯曲扭转耦合效果。双弯曲层压复合浅壳的堆叠序列表现出各种边界和几何形状,优化以最大化基本频率,而瑞利-RITZ方法开发用于振动分析。将最佳结果与分层优化方法和遗传算法进行比较,展示了SPS算法的鲁棒性和效率。 (c)2021 elestvier有限公司保留所有权利。

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