1. School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology 1 , Hefei 230009, China
2. Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Hefei University of Technology 2 , Hefei 230009, China
3. Department of Mechanical Engineering, University of Hong Kong 3 , Hong Kong, China
4. School of Computer and Information Engineering, Fuyang Normal University 4 , Fuyang 236037, China
5. Institute of Tribology, Hefei University of Technology 5 , Hefei 230009, People's Republic of China
6. College of Materials Science and Engineering, Hefei University of Technology 6 , Hefei 230009, China
7. Department of Mechanical Engineering, Hong Kong Polytechnic University 7 , Hong Kong, China