基于接头连接的核级管道结构优化研究

Research on Optimization of Nuclear Piping Structure Based on Explicit Description

在核电系统中,核级管道数量众多且布置复杂,特别是大型管道不仅价格昂贵、不易制造,且当某一部分出现问题时需整根更换,维护成本极高。为同时满足管道系统力学性能和降低更换成本、提高结构可制造性,首先在显式描述的可移动变形组件法(MMC)基础上,提出了基于接头连接的核级管道结构拓扑优化方法。在该方法中,管道结构拓扑通过一组具有显式几何信息的组件表示,使用少量设计变量即可完整描述管道布局。以刚度最大化为目标,以体积分数为约束,建立了基于MMC显式拓扑优化方法的问题列式。最后以短板算例验证了该方法的有效性。所提核级管道结构轻量化设计方法不仅可以有效降低制造成本、增强结构稳定性,还能提高可制造性和可更换性。

In the nuclear system,the magnitude of nuclear piping is large andtheir layout are complicated.Large pipes are expensive and difficult to manufacture,And when part of the problem occurs,the whole needs to be replaced.In order to meet the mechanical properties of the piping system,reduce the replacement cost,and improve the structural manufacturability.Firstly,a joint connection-based topology optimization method for nuclear piping structures is proposed,which is based on an explicit description method of the moving morphable component(MMC).In this method,the piping structure topology is represented by a set of components with explicit geometric information,and the piping layout can be fully described with a few design changes.Then,with the goal of maximizing stiffness and the volume fraction as the constraint,a problem based on MMC method is established.Finally,the short beam example is used to verify the effectiveness of the method.The proposed lightweight design method for nuclear piping structures can not only effectively reduce manufacturing costs,enhance structural stability,but also improve manufacturability and replaceability.