1. U.S. Army Engineer Research and Development Center, 72 Lyme Road, Hanover, NH 03755, USA
2. Department of Mechanical Engineering and Applied Research Laboratories, The University of Texas at Austin, 10000 Burnet Road, Austin, TX 78758, USA
3. Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ 08854, USA