基于有限元分析的复合阻尼覆盖层优化设计

Optimization design of composite damping tile base on finite element analysis

为了使铺设在舰艇上的复合阻尼覆盖层同时具有质量轻、阻尼性能好的综合特性,开展了基于有限元分析的优化设计。根据模态应变能量法原理,利用有限元软件Ansys对该阻尼覆盖层进行计算,并以复合阻尼覆盖层的一阶模态损耗因子的倒数为目标函数,在Ansys优化模块下进行优化设计,得出最佳的粘弹性层厚度、垫高层的厚度以及孔隙率。结果表明,通过优化后的复合阻尼覆盖层的质量轻,总厚度小,模态损耗因子增大,拥有更好综合性能。

In order to make the composite damping tile used on ship has light weight,small thickness,good damping properties of integrated features. Optimization design based on finite element analysis have been done. According to the principle of modal strain energy method,the composite damping tile is computed by finite element analysis（ FEA） of Ansys. The objective function is the reciprocal of first loss factor. In Ansys optimization platform,optimization design was used to acquire the thickness parameter of the viscoelastic layer,the thickness and the porosity parameters of stand-off layer. The results show that,through the optimization, the total thickness of composite damping tile decreased, the loss factor of composite damping tile increased,and the areal density of the tile was light,so the composite damping tile has better integrated features.