集成机理与数据的复杂模锻过程在线建模方法  

Online Modeling Method with Integrated Mechanism and Data for Whole Complex Forging Process

作　　者：吕文兵[1] 陆新江[1] 黄明辉[1] 雷杰[1] 邹玮[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《中国机械工程》2015年第9期1227-1232,共6页China Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB706802);国家自然科学基金资助项目(51205420);教育部新世纪优秀人才支持计划资助项目(NCET-13-0593);湖南省自然科学基金资助项目(14JJ3011);中南大学机电工程学院研究生创新项目(2014scxjj02)

摘　　要：大型航空锻件高精度成形成性依赖于精确的锻造过程模型,然而不规则的锻件形状、复杂的微观流变过程、强非线性与时变的负载力使得高精度的锻造过程模型难以获得。为此,在结合解析建模和数据建模优点的基础上,提出了集成机理与数据的复杂模锻过程在线建模方法。应用物理与过程知识推导了锻造过程的解析模型,在此基础上提出使用在线极限学习机方法构建由于泄漏、不确定性、干扰等引起的偏差模型,实现了锻造过程模型的实时进化,从而满足强非线性与时变性的锻造过程要求。实验结果表明,新方法能有效地建立复杂锻造过程模型,且比现有的方法有更好的建模精度。Forming of large aviation forging with high dimensional accuracy and high quality was dependent on highly precise model.However,it was hard to obtain precise model with complex forg-ing shape,complex microstructure of forging material,strongly nonlinear and time-varying forging force,and so on.The physical and analytical model was combined with online compensating data model to build a new model.This data model was based on online extreme learning machine （OS-ELM）,with the purpose of reducing modeling errors of analytical model caused by leakage,uncer-tainty,disturbance,and so on.And new model became less dependent on full data as well.This new model firstly took advantages of the analytical model built with kinetic equation and physical modeling method,and then used the OSELM model to build the deviation model.The forging process model could evolve over time,to satisfy the demands of highly nonlinear and time varying forging process. The simulation results show that,new model can predict the dynamic behavior of forging process well,and has a better prediction precision compared to the solo model which exists as part of the newmodel.

关 键 词：大型锻件 锻造过程 解析模型 在线极限学习机 

分 类 号：TG315.9[金属学及工艺—金属压力加工]