1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, China
2. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
3. Department of Mechanical Engineering, University of Bath, Bath, UK
4. School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou, China