1. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, China
2. CRRC Qingdao Sifang Co. Ltd, Qingdao, China
3. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, China
4. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, China