1. Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China
2. College of Information Engineering and Automation, Civil Aviation University of China, Tianjin 300300, China
3. Engineering Technology Department, Sichuan Airlines, Chengdu 610202, China
4. Department of Engineering Design and Mathematics, University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol, BS 161QY, UK