天然气发动机后处理器耐久分析方法

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中图分类号：TB115.1;U462.36；U464.174 文献标志码：B

Durability analysis method of after processor of natural gas engine

YANG Xiaodong， CHEN Zhengguo， QI Dongliang，HU Ting（Wuxi Weifu Lida Catalytic Converter Co.，Ltd.，Wuxi ，Jiangsu，China）

Abstract： 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 equivalentplastic strain （ Δε ）of after processor is simulated， and the Δε of value of the risk point CP1 is 1.02% . The random vibration analysis is conducted，and the stress of the risk point CP1 is 50.4MPa . According to the comprehensive damage calculation，the comprehensive damage value of the risk point CPl 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 O.O59，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.

Key Words：after processor；natural gas engine；durability analysis；thermal fatigue；random vibration comprehensive damage

0 引言

到 以上，同时整车路面激励传递到后处理器，会使后处理器承受较大幅度的振动应力。（剩余5884字）