基于优化加点代理模型的桥架结构疲劳寿命预测方法  

FATIGUE LIFE PREDICTION METHOD OF BRIDGE STRUCTURE BASED ON OPTIMIZED ADDITIVE POINT AGENT MODEL

作　　者：董青[1] 陈钰浩 刘永刚 戚其松[1] DONG Qing;CHEN YuHao;LIU YongGang;QI QiSong(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Weihua Group Co.,Ltd.,Xinxiang 453400,China)

机构地区：[1]太原科技大学机械工程学院,太原030024 [2]卫华集团有限公司,新乡453400

出　　处：《机械强度》2023年第3期729-742,共14页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(52105269,51805348);山西省研究生创新项目(2021Y692)资助。

摘　　要：为快速评估起重机服役过程中损伤桥架结构的安全性,提出基于优化加点代理模型的桥架结构疲劳寿命实时预测方法。以实测载荷数据为基础,结合工作循环过程,刻画服役工况相关参数的随机性;依据最不利服役工况,通过有限元静力学分析,结合失效案例统计,确定桥架结构应力薄弱位置,建立疲劳损伤和寿命预测的有限元模型,结合MSC.Fatigue的S-N模块与裂纹扩展模块,模拟随机工况下桥架结构的剩余寿命,分析不同裂纹深度对结构剩余寿命的影响;利用黑箱封装的思想,基于拉丁超立方抽样及Kriging模型,结合鹈鹕优化算法及加点准则,建立桥架结构寿命预测的优化加点代理模型,结合Miner线性累积损伤理论,实现小车带载移动过程中桥架结构的疲劳寿命实时预测。以QD20/10 t×43 m×12 m通用桥式起重机桥架结构为例,验证所提方法的可行性。通过与传统基于有限元仿真的疲劳寿命预测方法相比,结果表明,所提方法能够以较少的仿真调用次数和较短的仿真时间准确评估损伤桥架结构的剩余寿命,可为起重机检修周期制定与报废决策提供一定的参考意义。To quickly evaluate the safety of damaged bridge structures in the service process of cranes,a real⁃time prediction method for the fatigue life of bridge structures based on the optimal additive agent model is proposed.Based on the measured load data,the randomness of the relevant parameters of the service conditions is characterized by the combination of the working cycle process.In line with the most unfavorable service conditions,the stress weak position of the bridge structure is determined through finite element statics analysis and failure case statistics.And the structure finite element model is established for fatigue damage and life prediction.The MSC.Fatigue′s S⁃N module and crack propagation module are employed to simulate the residual life of the structure under random working conditions,and the influence of different crack depths on the residual life of the structure is analyzed.The Kriging model for the life prediction of the bridge structure that is optimized by the Pelican Optimization Algorithm and additive point criterion is created by the Latin Hypercube Sampling method and the black box theory.The real⁃time fatigue life prediction of bridge structures during trolley movement with load by Miner linear cumulative damage theory.The bridge structure of QD20/10 t×43 m×12 m general bridge crane is taken as an example to verify the feasibility of the proposed method.Comparing the proposed method with the traditional fatigue life calculation method based on finite element simulation,the results show that it can accurately assess the remaining life of the damaged bridge structure with fewer simulation calls and shorter simulation time,which can provide some reference significance for crane maintenance cycle formulation and scrapping decisions.

关 键 词：疲劳寿命 Kriging代理模型 有限元仿真 桥架结构 工作循环 

分 类 号：TH213.5[机械工程—机械制造及自动化]