摘要
针对高可靠性要求的堆内构件压紧弹簧,在考虑不确定性的条件、基于有限元方法开展可靠性仿真分析。根据工程实例和定性分析,确定脆性断裂为主要失效模式。首先建立压紧弹簧确定性分析模型,进行静力分析,获取典型工况下最大应力结果。在确定性分析模型基础上,构建压紧弹簧应力-强度干涉模型。考虑参数分散性,完成尺寸和强度不确定性参数建模及抽样。进一步考虑建模过程的简化影响,引入模型不确定性参数并完成参数建模及抽样。采用蒙特卡洛方法进行仿真计算,获取可靠度指标置信区间,利用响应面法分析参数可靠性灵敏度。可靠性仿真分析为堆内构件压紧弹簧设计改进优化提供参考,研究方法也可以应用于堆内构件中其他零部件的分析。
For the holddown spring of the reactor internals with high reliability requirement,the reliability simulation analysis was carried out based on the finite element method considering uncertainty.According to engineering examples and qualitative analysis,it was determined that brittle fracture was the main failure mode.Firstly,a deterministic analysis model of holddown spring was established and static analysis was carried out to obtain the maximum stress results under typical working conditions.Based on the deterministic analysis model,the stress-strength interference model of holddown spring of the reactor was constructed.Considering the dispersion of parameters,the modeling and sampling of the dimension and strength uncertain parameters were completed.By further considering the simplification effect of modeling process,the model uncertain parameters were introduced and the modeling and sampling of the model uncertain parameters were completed.The reliability index confidence interval was obtained by Monte Carlo method and the parameter reliability sensitivity was analyzed by response surface method.The reliability simulation analysis provides a reference for the design improvement and optimization of the holddown spring of reactor vessel internals.The research method can also be applied to other components of reactor.
作者
陈树
潘俊林
孙博
杨西
任羿
Chen Shu;Pan Junlin;Sun Bo;Yang Xi;Ren Yi(Science and Technology on Reactor System Design Technology Laboratory,Chengdu 610213,China;School of Reliability and Systems Engineering,Beihang University,Beijing 100191,China)
出处
《压力容器》
北大核心
2020年第9期46-52,共7页
Pressure Vessel Technology
关键词
压水堆
可靠性
压紧弹簧
不确定性
仿真分析
pressurized water reactor
reliability
holddown spring
uncertainty
simulation analysis
