1. School of Automation Science and Electrical Engineering, Beihang University, Beijing, China
2. School of Reliability and Systems Engineering, Beihang University, Beijing, China
3. Beihang School, Beihang University, Beijing, China
4. School of Electromechanical and Automotive Engineering, Yantai University, Yantai, China
5. Engineering Training Center, Beihang University, Beijing, China