基于不等间距灰色模型的疲劳寿命预测方法  

Fatigue Life Prediction Method Based on Non-equidistant Grey Model

作　　者：李国永[1] 谷正气[1,2] 张沙[1] 马骁骙 李吉平 胡楷[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南工业大学,株洲412007 [3]湘电重型装备股份有限公司,湘潭411100

出　　处：《中国机械工程》2015年第24期3267-3274,共8页China Mechanical Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA041805);中央财政支撑地方高校发展专项资金资助项目(0420036017);湖南大学汽车车身先进设计与制造国家重点实验室自主课题资助项目(734215002)

摘　　要：运用不等间距灰色模型与传统Miner准则相结合的方法对结构件的疲劳寿命进行了预测。首先针对应力统计分级得出的相邻应力间距不相等的情况,构建了不等间距灰色模型,并用遗传算法优化不等间距灰色模型的背景值以保证模型的精度。其次运用不等间距灰色模型与Miner准则相结合,建立了疲劳寿命预测的灰色Miner方法。再次采用算例验证了不等间距灰色模型建模的精确性以及将不等间距灰色模型应用于疲劳寿命预测的合理性。最后将该方法应用到矿用自卸车A形架的疲劳寿命预测之中,不仅提高了A形架疲劳寿命的预测精度,而且证明了该方法对构件疲劳寿命预测的有效性。Combining the non-equidistant grey model with traditional Miner rule,a method was proposed to predict the fatigue life of structural components.Firstly,in the case of non-equidistant stress grading statistics,non-equidistant grey model was constructed,and genetic algorithm was used to optimize the values of background value to ensure the accuracy.And,combining the non-equidistant grey model with Miner rule,grey Miner method was constructed to predict fatigue life.Then a numerical example proved the accuracy of non-equidistant grey model and the effectiveness of grey Miner method.Finally the method previously mentioned was applied to the fatigue life prediction of A？shape frame.The results show that it improves the accuracy of fatigue life prediction of A-shape frame and proves the effectiveness of the grey Miner method to predict fatigue life of components.

关 键 词：疲劳寿命预测 不等间距 灰色模型 A形架 

分 类 号：O346.2[理学—固体力学] TD57[理学—力学]