[1] Xidian Univ, Sch Mechanoelect Engn, Minist Educ, Key Lab Elect Equipment Struct Design, Xian 710071, Peoples R China
[2] Xidian Univ, Sch Mechanoelect Engn, Ctr Complex Syst, Xian 710071, Peoples R China
[3] Peking Univ, Coll Engn, Ctr Syst & Control, Beijing 100871, Peoples R China