4YU Yu-zhen 1 , 2 , REN Xin-yi 2 , DU Feng-shan 2 , SHI Jun-jie 2 ( 1.Institute of Mechanical Engineering , Hebei United University , Tangshan 063009 , Hebei , China ,2.Institute of Mechanical Engineering , Yanshan University , Qinhuangdao 066004 , Hebei , China ).Application of Improved PSO Algorithm in Hydraulic Pressing System Identification[J].Journal of Iron and Steel Research(International),2012,19(9):29-35. 被引量:1