1. School of Mathematics and Statistics, Qingdao University, Qingdao, China
2. Center for Computational Mechanics & Engineering Simulation, Qingdao University, Qingdao, China
3. College of Computer Science and Technology, Qingdao University, Qingdao, China
4. Beijing Key Laboratory on Nonlinear Vibrations and Strength of Mechanical Structures, College of Mechanical Engineering, Beijing University of Technology, Beijing, China