1. Department of Mechanical Engineering, University of Michigan–Ann Arbor, 1035 H. H. Dow, 2350 Hayward Street, Ann Arbor, MI 48109-2136
2. State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
3. Department of Mechanical Engineering, University of Michigan–Ann Arbor, 1023 H. H. Dow, 2350 Hayward Street, Ann Arbor, MI 48109-2136