A Gaussian process regression‐based surrogate model of the varying workpiece dynamics for chatter prediction in milling of thin‐walled structures  

作　　者：Yun Yang Yang Yang Manyu Xiao Min Wan Weihong Zhang 

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an,China [2]State IJR Center of Aerospace Design and Additive Manufacturing,Northwestern Polytechnical University,Xi'an,China [3]School of Mathematics and Statistics,Northwestern Polytechnical University,Xi'an,China

出　　处：《International Journal of Mechanical System Dynamics》2022年第1期117-130,共14页国际机械系统动力学学报（英文）

基　　金：The National Natural Science Foundation of China,Grant/Award Numbers:52175437,12032018;Young Talents Support Project of Shaanxi Province,Grant/Award Number:20190404;Fundamental Research Funds for the Central Universities,Grant/Award Number:31020210506003;Natural Science Foundation of Shannxi Province,Grant/Award Number:2021JM‐043;supported by the National Natural Science Foundation of China(Nos.52175437 and 12032018);the Young Talents Support Project of Shaanxi Province(No.20190404);the Fundamental Research Funds for the Central Universities(No.31020210506003);the Project supported by the Natural Science Foundation of Shannxi Province(No.2021JM‐043).

摘　　要：Since the dynamics of thin‐walled structures instantaneously varies during the milling process,accurate and efficient prediction of the in‐process workpiece(IPW)dynamics is critical for the prediction of chatter stability of milling of thin‐walled structures.This article presents a surrogate model of the IPW dynamics of thin‐walled structures by combining Gaussian process regression(GPR)with proper orthogonal decomposition(POD)when IPW dynamics at a large number of cutting positions has to be predicted.The GPR method is used to learn the mapping between a set of the known IPW dynamics and the corresponding cutting positions.POD is used to reduce the order of the matrix assembled by the mode shape vectors at different cutting positions,before the GPR model of the IPW mode shape is established.The computation time of the proposed model is mainly composed of the time taken for predicting a known set of IPW dynamics and the time taken for training GPR models.Simulation shows that the proposed model requires less computation time.Moreover,the accuracy of the proposed model is comparable to that of the existing methods.Comparison between the predicted stability lobe diagram and the experimental results shows that IPW dynamics predicted by the proposed model is accurate enough for predicting the stability of milling of thin‐walled structures.

关 键 词：flexible workpieces Gaussian process regression in‐process workpiece dynamics milling stability proper orthogonal decomposition stability lobe diagram 

分 类 号：TG5[金属学及工艺—金属切削加工及机床]