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Rui Guo 1,2,* , Zhiqian Zhao 1,3, Tao Wang 1,4, Guangheng Liu 1,4, Jingyi Zhao 2,4 and Dianrong Gao 3 1 Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004, China; zzq623310996@163.com (Z.Z.); m13237195956@163.com (T.W.); lgh18733407119@163.com (G.L.) 2 The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China; zjy@ysu.edu.cn 3 Key Laboratory of Advanced Forging and Stamping Technology and Science, Yanshan University, Qinhuangdao 066004, China; gaodr@ysu.edu.cn 4 Hebei Key Laboratory of Special Delivery Equipment Yanshan University, Qinhuangdao 066004, China * Correspondence: guorui@ysu.edu.cn

Degradation State Recognition of Piston Pump Based on ICEEMDAN and XGBoost