不同温度下含裂纹压气机叶片的模态特征和振动特性分析周震霆，贺星，刘永葆(海军工程大学动力工程学院，湖北武汉430033)摘要:本文选取含裂纹悬臂梁模拟含裂纹压气机叶片，基于无质量扭转弹簧和呼吸式裂纹刚度模型，得到一种不同环境温度下含裂纹压气机叶片的模态特征和振动特性的分析方法。通过弹性模量引入温度模块，利用无质量扭转弹簧连续条件得到关于含裂纹梁的特征方程，分析环境温度和裂纹深度对含裂纹梁固有频率的影响；利用悬臂梁的强迫弯曲振动方程，引入呼吸式裂纹刚度模型，改变激振力频率，分析环境温度及激振频率对含裂纹梁振动位移响应的影响。结果表明，环境温度越高，含裂纹梁的固有频率越小，梁的振动位移响应越大。同时，激振频率的选取也具有一定影响。关键词：压气机叶片；呼吸式裂纹；温度；模态特征；振动特性中图分类号：TK221文献标识码：A文章编号：1672–7649(2023)12–0093–06doi：10.3404/j.issn.1672–7619.2023.12.017AnalysisofmodalcharacteristicsandvibrationcharacteristicsofcrackedcompressorbladesatdifferenttemperaturesZHOUZhen-ting,HEXing,LIUYong-bao(SchoolofPowerEngineering,NavalUniversityofEngineering,Wuhan430033,China)Abstract:Inthispaper,acrackedcantileverbeamisselectedtosimulateacrackedcompressorblade.Basedonamass-lesstorsionspringandabreathingcrackstiffnessmodel,amethodforanalyzingthemodalcharacteristicsandvibrationchar-acteristicsofacrackedcompressorbladeatdifferentambienttemperaturesisobtained.Theelasticmodulusisintroducedin-tothetemperaturemodule,andthecharacteristicequationaboutthecrackedbeamisobtainedbyusingthecontinuouscondi-tionofthemasslesstorsionspring,andtheinfluenceoftheambienttemperatureandcrackdepthonthenaturalfrequencyofthecrackedbeamisanalyzed;theforcedbendingvibrationequationofthecantileverbeamisusedtointroducethebreathingThecrackstiffnessmodelwasusedtochangetheexcitationforcefrequencytoanalyzetheinfluenceofambienttemperatureandexcitationfrequencyonthevibrationdisplacementresponseofthebeamwithcracks.Theresultsshowthatthehighertheambienttemperature,thesmallerthenaturalfrequencyofthebeamwithcracks,andthegreaterthevibrationdisplacementresponseofthebeam;atthesametime,theselectiono...
