1. School of Electromechanical EngineeringXidian UniversityNo. 2 Taibai South RoadXi'an710071People's Republic of China
2. Xinjiang Astronomical ObservationChinese Academy of SciencesNo.150 Science 1‐StreetUrumqi830011People's Republic of China
3. Department of Mechanical EngineeringUniversity of ChesterChesterCH2 4NUUK