快堆装载机支臂结构的动静态性能拓扑优化设计方法

Dynamic-static Topology Optimization Design Method of Fast Reactor Loader Arm

针对快堆装载机支臂结构的动静态性能和轻量化设计要求,采用有限元法验证了原结构的安全性,提出一种基于变密度法固体各向同性惩罚微结构(SIMP),通过引入标准化系数建立将多工况刚度和动态多个低阶关键固有频率归一为组合柔度指数最小的动静态多目标拓扑优化数学模型,并得到了合理的整体Pareto解。分析结果表明,根据拓扑优化结果改进设计的支臂动态性能明显提高,在安全停堆(SSE)工况下最大Tresca应力减小约10%,结构重量减轻约21.5%,较好地达到了既提高性能又减轻重量的结构优化目标。

Aiming at the dynamic and static performance and lightweight design requirements of the fast reactor loader arm,the safety of the original structure was verified by finite element analysis. Solid isotropic microstructures with penalization( SIMP) of artificial materials method was proposed. Introducing the normalization coefficient,the dynamic and static multi-objective topology optimization mathematical model was established to combine the multi-condition stiffness and the dynamic key low-order frequencies into minimun combined compliance index,and the global Pareto solution was obtained. The results showed that the dynamic performance of the redesigned arm based on the topology optimization results increased greatly with a decrease of about 10% of maximum Tresca stress under SSE condition and a decrease of about 21. 5% of weight,well meeting the structure optimization goal of improving performances and reducing weight.