1. State Key Lab of Automotive Safety and Energy; Department of Automotive Engineering, Tsinghua University; Beijing China
2. Department of Mechanical Science and Engineering; University of Illinois Urbana-Champaign; Urbana IL USA
3. State Key Lab of Automotive Safety and Energy; Department of Automotive Engineering; Tsinghua University Beijing China
4. Department of Mechanical Engineering; University of Michigan; Ann Arbor MI USA