[1] Xihua Univ, Sch Mech Engn, 9999 Hongguang Ave, Chengdu 611730, Sichuan, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Automat Engn, Chengdu, Peoples R China
[3] Southwest Petr Univ, Sch Mat Sci & Engn, Chengdu, Peoples R China
[4] Patent Examinat Cooperat Sichuan Ctr Patent Off, Chengdu, Peoples R China
[5] Petrochina Southwest Pipeline Co, Chengdu, Peoples R China