1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
2. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
3. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Guangdong, P.R. China
4. Department of Mechanical Engineering, Embry-Riddle Aeronautical University, Daytona Beach, Florida, USA