1. College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
3. Linyi Inspection and Testing Center, Linyi 276000, China
4. Beijing Wuzi University, No. 321, Fuhe Street, Tongzhou District, Beijing 101100, China