~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~设计与计算柴油机设计与制造DesignandManufactureofDieselEngine2023年第2期第29卷（总第183期）25.2L柴油机摇臂的仿真分析与优化周明明（上海新动力汽车科技股份有限公司，上海200438）摘要：为了分析某25.2L柴油机摇臂断裂的原因，借助Abaqus和FEMFAT有限元分析软件，对柴油机摇臂组件在运行工况下的结构应力及高周疲劳进行分析，并对摇臂危险区域进行优化后再次进行仿真分析，直到摇臂满足设计要求。结果表明：考虑装配过盈力时摇臂的峰值应力比未考虑过盈力时高10.6%，考虑装配过盈力时仿真结果与试验结果相吻合；直角卸油槽为摇臂局部薄弱区域，使用圆弧形卸油槽代替直角卸油槽能有效降低局部应力集中；优化后摇臂峰值应力降低17.5%，摇臂抗疲劳性能得到提升。关键词：柴油机；摇臂；应力集中；仿真；优化Simulationandoptimizationofa25.2LdieselenginerockerZHOUMingming（ShanghaiNewPowerAutomotiveTechnologyCo.，Ltd.，Shanghai200438，China）Abstract：Thecauseofbrokenhappenedona25.2Ldieselenginerockerwasconducted，whileAbaqusandFEMFATfiniteelementanalysissoftwareswereusedtoanalyzethestructuralstressandhighcyclefatigueofdieselenginerockercomponentsunderworkingconditions，andthedangerousareasoftherockerwereoptimizedandsimulateduntilreachingthedesignstandard.Theresultsshowthatthepeakstressofrockerwithassemblyinterferenceforceis10.6%higherthanthatwithoutassemblyinterfer⁃enceforce，andthesimulationresultsareconsistentwiththetestresultswhenassemblyinterferenceforceisconsidered.Theright⁃angleoilunloadinggrooveisthelocalweakareaoftherocker.Usingthearc⁃shapedoilunloadinggrooveinsteadoftheright⁃angleoilunloadinggroovecaneffectivelyreducethelocalstressconcentration.Afteroptimization，thepeakstressoftherockerisreducedby17.5%，andthefa⁃tigueperformanceoftherockerisimproved.Keywords：dieselengine；rocker；stressconcentration；simulation；optimizationDOI：10.3969/j.issn.1671-0614.2023.02.0020前言摇臂是发动机重要的运动部件之一，凸轮轴传递的推力经过摇臂转向后推开气门弹簧，控制气门的启闭，以保证发动机正常运转。发动机通过进气侧摇臂和排气侧摇臂控制进气阶段和排气阶段的开始、结束及持续时间［1］。摇臂...
