1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, PR China
3. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai, PR China
4. The Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong