天然气发动机后处理器耐久分析方法  

Durability analysis method of after processor of natural gas engine

作　　者：杨小东 陈正国 齐冬亮 胡婷 YANG Xiaodong;CHEN Zhengguo;QI Dongliang;HU Ting(Wuxi Weifu Lida Catalytic Converter Co.,Ltd.,Wuxi 214177,Jiangsu,China)

机构地区：[1]无锡威孚力达催化净化器有限责任公司,江苏无锡214177

出　　处：《计算机辅助工程》2025年第1期20-24,30,共6页Computer Aided Engineering

摘　　要：考虑热疲劳和振动疲劳损伤,建立天然气发动机后处理器的综合损伤模型和计算方法。通过热机耦合分析,模拟计算后处理器等效塑性应变幅值Δε的分布结果,得到危险点CP1的Δε值为1.02%。通过随机振动分析计算后处理器应力分布结果,CP1的最大应力值为50.4 MPa。根据综合累积损伤模型,计算得到CP1的综合累积损伤为1.223,不满足耐久性指标。通过改变左隔板焊接方式进行结构优化,优化方案中CP1的综合累积损伤为0.059,满足耐久性指标。研究结果可为天然气发动机后处理器的结构耐久性评估和结构优化提供参考。Considering the damage of thermal fatigue and vibration fatigue,the theoretical model and calculation process of comprehensive cumulative damage are established.By thermo-mechanical coupling analysis,the distribution of amplitude of equivalent plastic strain(Δε)of after processor is simulated,and theΔεof value of the risk point CP1 is 1.02%.The random vibration analysis is conducted,and the stress of the risk point CP1 is 50.4 MPa.According to the comprehensive damage calculation,the comprehensive damage value of the risk point CP1 is 1.223,which cannot meet the durability requirement.The structure is optimized by changing the welding method of the left partition,and the comprehensive damage of the risk point CP1 is 0.059,which can meet the durability requirement.The results can provide good guidance for durability evaluation and structure optimization of the after processor of natural gas engine.

关 键 词：后处理器 天然气发动机 耐久分析 热疲劳 随机振动 综合损伤 

分 类 号：TB115.1[理学—数学] U462.36[理学—应用数学] U464.174[机械工程—车辆工程]