1. Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, P. R. China
2. Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo 315100, P. R. China
3. Institute of Unmanned System, Beihang University, Beijing 100191, P. R. China
4. Beijing Key Laboratory for Powder Technology Research and Development, School of Aeronautical Science and Engineering, Beihang University, Beijing 100191, P. R. China