复合材料浅球壳模态分析与结构优化设计

Finite Element Analysis on Vibration Modes and Structure Optimal Design of the Symmetrically Laminated Orthotropic Shallow Shells

复合材料层合壳体在航空、航天、工程结构中得到了广泛应用。结合复合材料层合浅球壳的结构特点,基于有限元分析软件ANSYS,采用层合壳单元建立有限元模型,分析了几种壳体参数对浅球壳自振频率的影响,并采用函数逼近法和梯度寻优法相结合的方法对壳体参数进行优化设计,给出了壳体参数的最优组合,使壳体的一阶自振频率为最大,改善了壳体的动态特性,为复合材料层合浅球壳的结构设计提供了有价值的理论依据,也为进一步进行结构动力学分析奠定基础。

Based on ANSYS system, a structural analysis of symmetrically laminated orthotropic shallow shells, which is made up of multiple layers of different materials and meshed by linear layered structural shell elements, is represented. The effects of shells parameters on the frequencies are studied detailedly. Based on the geometrical characteristics of symmetrically laminated orthotropic shallow shells, an optimal design for shells parameters about a symmetrically laminated orthotropie shallow shell by using both the sub-problem approximation optimal method and the first-order approximation optimal method is performed,which get the maximal 1st set frequency. Calculation results of a practical example show that the design method is audio-visual and rational, which are the foundation of the further dynamical analysis.