天然氣發(fā)動機后處理器耐久分析方法

打開文本圖片集

中圖分類號：TB115.1;U462.36；U464.174 文獻標志碼：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，同時整車路面激勵傳遞到后處理器，會使后處理器承受較大幅度的振動應力。（剩余5884字）