1. Associate Professor, College of Mechanical Engineering, Hunan Univ. of Arts and Science, Changde 415000, China (corresponding author).
2. Professor, College of Mechanical and Vehicle Engineering, Hunan Univ., Changsha, Hunan 410073, China.
3. Professor, College of Mechanical Engineering, Hunan Univ. of Arts and Science, Changde 415000, China.