1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipment Control, Tsinghua University, Beijing, China
2. Department of Mechanical Engineering, Tsinghua University, Beijing, China
3. Department of Energy and Power Engineering, Tsinghua University, Beijing, China
4. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China