1. Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
2. Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
3. Multifunctional Equipment Integration Group, Buildings and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4. Ultrasonic Technology Solutions, 10820 Murdock Dr, Suite 104, Knoxville, Tennessee 37932, USA