Buckling analysis and optimization of blade stiffened variable stiffness panels
Buckling analysis and optimization of blade stiffened variable stiffness panels
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DOI：
10.2514/6.2015-1438
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发表时间：
2015-01
期刊：
影响因子：
--
通讯作者：
Broderick H. Coburn;Zhangming Wu;P. Weaver
中科院分区：
文献类型：
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作者：
Broderick H. Coburn;Zhangming Wu;P. Weaver
基于Rayleigh-Ritz能量法建立了一个快速、稳健的叶片加筋变刚度壁板屈曲分析的半解析模型。该方法包括经常被忽视的，但重要的，加劲肋的分析范围不仅占刚度的局部增加，但第一次在瑞利-里兹方法，允许结构响应的刚度不连续的位置在一个不连续的方式。这是通过在不连续的位置，如边缘和分配每个区域的个别形状函数，从而防止在屈曲模态形状的全球C1连续响应的离散化面板。该模型被证明是在良好的协议，计算效率相比，一个商业有限元分析软件包。然后，该模型被用于遗传算法优化研究，设计叶片加筋变刚度面板应用实际的设计和故障约束。结果进行了比较，与优化的传统加筋板和所考虑的情况下，质量节省超过6%，被证明是可以实现的，当利用变刚度层压板作为加筋板上的皮肤。
A rapid and robust semi-analytical model is developed based on the Rayleigh-Ritz energy method for the buckling analysis of blade stiffened variable stiffness panels. The method includes the often neglected, yet important, stiffener ange in the analysis by not only accounting for the local increase in stiffness but, for the first time in a Rayleigh-Ritz method, allowing the structure to respond in a discontinuous manner at the location of the stiffness discontinuity. This is achieved by discretizing the panel at locations of discontinuities such as ange edges and assigning each region individual shape functions thus preventing a global C1-continuous response in the buckled mode shape. The model is shown to be in excellent agreement with, and computationally efficient when compared to, a commercial FEA package. The model is then used in a genetic algorithm optimization study to design blade stiffened variables stiffness panels by applying practical design and failure constraints. Results are compared with optimized conventional stiffened panels and for the case considered, mass savings over 6% are shown to be achievable when utilising variable stiffness laminates as the skin on stiffened panels.