1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, LN, China;
2. Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080 e-mail:
3. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, LN, China e-mail:
4. School of Mechanical Engineering, Dalian University of Technology Dalian, Dalian 116024, LN, China e-mail: