1. Department of Mechanics and Engineering, Sichuan University, Chengdu 610065 Sichuan, P. R. China
2. Key Laboratory of Icing and Anti/De-Icing, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan, P. R. China
3. College of Computer Science, Chengdu University, Chengdu 610106, Sichuan, P. R. China
4. Key Laboratory of Pattern Recognition and Intelligent Information Processing of Sichuan, Chengdu University, Chengdu 610106, Sichuan, P. R. China