1. Nanyang Technological University, School of Mechanical and Aerospace Engineering, 50 Nanyang Avenue, 639798 Singapore.
2. Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin 300072, China and University of Wyoming, Department of Mechanical Engineering, Laramie, Wyoming 82072, USA. (corresponding author)
3. Nanyang Technological University, School of Mechanical and Aerospace Engineering, 50 Nanyang Avenue, 639798 Singapore. (corresponding author)