Optimal Structural Frequency Design of Stiffened Shell
Optimal Structural Frequency Design of Stiffened Shell
复制标题
DOI：
10.4028/www.scientific.net/amm.157-158.1636
复制
发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
D. Mi;Rui Yang;Liang Zhou;Yang Liu;D. Guo
中科院分区：
文献类型：
--
作者：
D. Mi;Rui Yang;Liang Zhou;Yang Liu;D. Guo
研究了加筋壳结构的频率目标优化设计问题。前几阶模态频率收敛到一组目标值是一个逆向设计问题。提出了一种改进的双向渐进结构优化与尺寸优化相结合的设计方法。优化模型由蒙皮和规则网格框架结构组成。针对普通拓扑优化结果中经常出现的不规则分支和孔洞问题，以框架中肋的存在状态代替单元作为设计变量，并对肋的灵敏度进行了讨论。通过尺寸优化进行了详细设计。算例表明，该方法达到了频率要求。优化后的结构规则、清晰，避免了局部模态问题。这非常适合于飞机风洞颤振试验模型的设计。
Frequency-aimed optimal structural design of stiffened shell is concerned. It is a reverse design problem for the first several modal frequencies to converge to a set of target value. A design method combined modified bi-directional evolutionary structural optimization (BESO) and size optimization is presented. Optimization model consists of skin and regular grid frame structure. To solve irregular branches and holes that often exist in ordinary topology optimization results, instead of elements, the existence states of ribs in the frame are used as design variables and sensitivity of the rib is discussed. Detailed design is conducted by size optimization. Example shows that frequency requirements are achieved. And the optimum structure is regular and clear, the localized modes problem is avoid. This is very suitable for designing airplane wind tunnel flutter test models.