1. 1 Faculty of Engineering, Department of Industrial Machines and Equipment , “Lucian Blaga” University , Sibiu , Romania
2. 2 Faculty of Engineering, Department of Industrial Machines and Equipment , “Lucian Blaga” University , Sibiu , Romania
3. 3 Faculty of Engineering, Department of Industrial Engineering and Management , “Lucian Blaga” University , Sibiu , Romania
4. 4 Faculty of Engineering, Department of Industrial Machines and Equipment , “Lucian Blaga” University , Sibiu , Romania
5. 5 Faculty of Engineering, Department of Industrial Engineering and Management , “Lucian Blaga” University , Sibiu , Romania