1. School of Electromechanical Engineering, Beifang University of Nationalities, Yinchuan, Ningxia, China
2. School of Chemistry and Chemical Engineering, Beifang University of Nationalities, Yinchuan, Ningxia, China
3. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China