1. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, People's Republic of China
2. Research Institute of Beihang University in Shenzhen, Shenzhen 518000, People's Republic of China
3. Institute of Advanced Manufacturing Technology, Ningbo Institute of Material Technology and Engineering, Ningbo 315210, China
4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore