1. Master, College of Electronic Information and Automation, Tianjin Univ. of Science and Technology, No. 1038 Dagu Nanlu, Hexi District, Tianjin 300222, PR China.
2. Ph.D. Student, School of Precision Instrument and Opto-Electronics Engineering, Tianjin Univ., No. 92 Weijin Rd., Nankai District, Tianjin 300072, PR China.
3. Professor, College of Electronic Information and Automation, Tianjin Univ. of Science and Technology, No. 1038 Dagu Nanlu, Hexi District, Tianjin 300222, PR China; Professor, Advanced Structural Integrity International Joint Research Centre, Tianjin Univ. of Science and Technology, 1038 Dagunan Rd., Tianjin 300222, PR China (corresponding author).
4. Associate Professor, College of Electronic Information and Automation, Tianjin Univ. of Science and Technology, No. 1038 Dagu Nanlu, Hexi District, Tianjin 300222, PR China; Associate Professor, Advanced Structural Integrity International Joint Research Centre, Tianjin Univ. of Science and Technology, 1038 Dagunan Rd., Tianjin 300222, PR China.
5. Ph.D. Student, College of Electronic Information and Automation, Tianjin Univ. of Science and Technology, No. 1038 Dagu Nanlu, Hexi District, Tianjin 300222, PR China.
6. Ph.D. Student, Dept. of Mechanical Engineering, Univ. of Sheffield, Sheffield S1 3JD, UK.
7. Senior Engineer, Pipeline R&D Center, China National Petroleum Corporation, Langfang, Hebei 065000, PR China.
8. Engineer, Pipeline R&D Center, China National Petroleum Corporation, Langfang, Hebei 065000, PR China.