简谐激励下板壳结构加强筋仿生布局降噪方法

摘要

分析叶脉脉序形态的形成机理及构型规律，提取叶脉脉序生长的结构力学准则。以最小弹性应变能与抑制最大剪应力为主及次脉生长准则、以矢量平衡方程为脉序分歧准则建立具有叶脉分枝结构特征的板壳加强结构仿生设计模型。以降低谐振结构声辐射为目标，利用相似原理提出适合板壳结构加强筋布局设计的仿生脉序生长算法。并用典型薄板结构进行加强筋分布设计，验证板壳加强结构仿生布局方法在降噪中的可行性及有效性。%A structural mechanical criterion for leaf vein growth was extracted by analyzing the leaf venation morphogenesis.A primary vein growth was governed by the minimal elastic strain energy while a secondary vein growth by the releasing of maximal shear stress.At each junction,leaf veins were oriented and their widths were set according to a vector equilibrium equation.A bionic design model of reinforced plate /shell structure was established with the feature of leaf vein branched structure.By using the similarity principle,a bionic venation growth algorithm was presented to address the stiffener layout design for plate /shell structures to mitigate structural acoustic radiation.Taking typical thin plate structures for instance,the stiffener layout designs were implemented to verify the practicability and effectiveness of the bionic venation growth approach in noise reduction.