1. Assistant Professor, Mechanical Engineering Faculty, Shahrood Univ. of Technology, P.O. Box 316, Shahrood, I.R., Iran (corresponding author). E-mail: hamidre_2000@yahoo.com
2. Professor, Mechanical Engineering Dept., Tarbiat Modarres Univ., P.O. Box 14115-117, Tehran, I.R., Iran. E-mail: khadem@modares.ac.ir
3. Associated Professor, Mechanical Engineering Dept., Tarbiat Modarres Univ., P.O. Box 14115-143, Tehran, I.R., Iran. E-mail: sherbaf@modares.ac.ir