约束阻尼结构的双向渐进拓扑优化  

Topological optimization for constrained layer damping material in structures using BESO method

作　　者：房占鹏[1] 郑玲[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《振动与冲击》2014年第8期165-170,191,共7页Journal of Vibration and Shock

基　　金：机械传动国家重点实验室科研业务费(0301002109165)

摘　　要：针对约束层阻尼板的拓扑优化问题,以模态损耗因子最大化为目标函数,约束阻尼材料体积分数为约束条件,建立了约束阻尼板的拓扑优化模型。基于模态应变能方法,推导了目标函数对设计变量的灵敏度。采用双向渐进优化算法(BESO)对约束阻尼材料的布局进行了拓扑优化,获得了约束阻尼材料的最优拓扑构型,并与渐进优化算法(ESO)进行了比较。研究结果表明:双向渐进优化算法相比渐进优化算法,获得的模态损耗因子更高,阻尼减振效果更好。A topological optimization model was established to obtain an optimized layout of constrained layer damping material on a plate with passive constrained layer damping （PCLD）treatment.The maximization of modal loss factor was taken as an objective function to enhance damping of this plate.The volume fraction of constrained layer damping material was selected as the constrained condition of the model.The sensitivity of the objective function to design variables was deduced by using the modal strain energy method.The bi-directional evolutionary structural optimization （BESO）method was proposed to search the optimal layout of constrained layer damping material.The numerical examples were illustrated to demonstrate the effectiveness of the proposed BESO method.The results were compared with those with the conventional evolutionary structural optimization （ESO）method.It was demonstrated using that the proposed BESO method can be used to achieve higher modal loss factor for the plate with PCLD treatment than using conventional ESO method does;the damping effect of the plate is enhanced and the effectiveness of the proposed BESO method is verified.

关 键 词：约束阻尼 模态损耗因子 拓扑优化 双向渐进优化法 

分 类 号：TB53[理学—物理]