1. Dept. of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina Univ., Hamedan, IR (Corresponding author), e-mail: a.h.mahmoudi@gmail.com
2. Dept. of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina Univ., Hamedan, IR.
3. Dept. of Engineering Design and Mathematics, Univ. of the West of England, Bristol, BS16 1QY, UK