1. Dept. of Mechanical Engineering, Texas Tech Univ., Lubbock, TX 79409, US (Corresponding author), e-mail: changdong.yeo@ttu.edu
2. Dept. of Aeronautics & Astronautics, Air Force Institute of Technology, Wright Patterson AFB, OH 45433, US.
3. Dept. of Mechanical Engineering, Texas Tech Univ., Lubbock, TX 79409, US.