1. Faculty of Mechanical Engineering, Lublin University of Technology, Lublin, Poland, EU, k.drozd@pollub.pl
2. Mechanical Science Institute, Vilnius Gediminas Technical University, Vilnius, Lithuania, EU, jonas.matijosius@vilniustech.lt
3. Department of Information Technologies, Ukrainian National Forestry University, Lviv, Ukraine, boretska@nltu.edu.ua