1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an, P. R. China;
2. Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science & Engineering, Zigong, Sichuang, P. R. China
3. School of Mechanical Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi, P. R. China;