摘要摘要气门弹簧是内燃机配气机构中气门组件的重要组成部分，它可保证气门关闭时,依靠弹力使气门与阀座保持闭合密封。而气门弹簧受强度、刚度、稳定性等约束条件较多，使其尺寸也受到限制,导致其应力状态严重。因此，对气门弹簧进行结构分析与其参数的优化就变的尤为重要。本文分析了弹簧的结构参数，得出设计公式。然后基于实体建模进行分析，得到变形量与应力分布图。再基于梁单元对弹簧进行分析，并于设计公式得到的结果进行比较。最后，通过分析内燃机气门弹簧优化设计的设计变量、目标函数和约束条件,建立起以内燃机气门弹簧的质量、高度为目标函数的多目标优化设计数学模型,利用理想点法统一目标函数，并给出了设计实例。算例结果表明该方法具有工程实用价值；并通过MATLAB提供的可视化界面设计，设计出了可视化界面程序。本文对弹簧进行了有限元分析得出变形量与应力分布图。而对弹簧的优化设计方法，能够准确优化出弹簧的参数，能缩短气门弹簧优化的时间，具有实用价值。关键词：气门弹簧，多目标，优化设计，可视化界面，有限元IAbstractAbstractValvespringisanimportantpartofthevalvemechanism.Itcanensurethatvalveisclosed.Therearemoresectorsthatrestrictthevalvespringsuchasthestrength,stiffness,stabilityconstraints,leadingtoseverestress.Therefore,structuralanalysisofthevalvespringanditsoptimizationparametersisparticularlyimportant.Startingfromthestructureofspringinthispaper,thenwecangettheformulaofspring.Then,basedonthespringbeamelementanalysis,wecangetthefigureofdeformationandstressdistribution.Furtheranalysisbasedonrealmodelingandwasdesignedtocomparetheresultsoftheformula.Finally,throughanalysisthedesigningvariables,targetfunctionsandrelatedconstraintsofvalvespringinInternalCombustionEngines,itsetuptheoptimumdesignmathmodelofmulti-objective.Theoptimumdesignmultipleofmulti-objectivewasexplore.Thedesigningexamplewasoffered,theresultshowedthatmethodisthemoreengineeringpractical.MATLABprovidesGUI,wecandesignoftheprogramofvisualinterface.Thismethodofoptimization,canaccuratelyoptimizetheparametersofthespring.Wecanshortentheoptimizationtimeandithaspracticalvalue.Keywords:valvespring;multi-objective;optimaldesign;visualinterface;finiteelementII目录目录摘要...............................................................IAbstract...........................................................II目录.............................................................III第一章绪论.........................................................11.1课题的背景和意义............................................11.2国内外研究现状..............................................11.3本文的主要研究内容..........................................4第二章圆柱螺旋弹簧设计计算方法.....................................52.1圆柱螺旋弹簧的几何参数......................................52.2圆柱螺旋压缩弹簧的稳定性与自振频率..........................62.3圆柱螺旋压缩弹簧的结构与设计计算............................72.4本章小结....................................................9第三章基于有限元的圆柱螺旋弹簧分析................................103.1基于实体单元的圆柱螺旋弹簧的分析...........................103.2基于梁单元的圆柱螺旋弹簧的分析.............................153.3本章小结...................................................20第四章节距对圆柱弹簧刚度强度计算结果的影响........................214.1螺旋角对圆柱弹簧刚度计算结果的影响.........................214.2变节距弹簧刚度强度计算结果的影响...........................224.3本章小结...................................................25第五章气门弹...
