1. Department of Mechanics, Tianjin University, 300072, China
2. Dynamics and Vibrations Group, Numerical Methods in Mechanical Engineering, Technische Universite at Darmstadt, Dolivostr. 15, Darmstadt 64293, Germany
3. Department of Astronautics, Shenyang Aerospace University, Shenyang 110136, China
4. School of Science, Harbin Institute of Technology, Shenzhen 518055, China