1. Hebei Key Laboratory of Robot Perception and Human-robot Interaction
2. School of Mechanical Engineering
3. Hebei University of Technology
4. Tianjin 300401
5. China
6. Department of Materials Science and Engineering
7. The Pennsylvania State University
8. University Park
9. USA
10. Department of Engineering Science and Mechanics
11. Department of Mechanical and Industrial Engineering
12. Northeastern University
13. Boston
14. Plant Fiber Research Center
15. Department of Chemical Engineering