“…The considerations and results presented in this paper ay be very useful for researchers in any scientific area, especially in applied sciences e.g. biotechnology (Skrzypczak-Pietraszek et al, 2018), materials science (Lipinski, 2010;Szczotok et al, 2018), machining (Ulewicz and Selejdak, 2018), special coating (Pliszka et al, 2018;Radek et al, 2018a;Radek et al, 2018b) or machine building (Pacana and Pacana, 2018), especially heavy-duty (Domagala et al, 2018a;Domagala et al, 2018b;Fabis-Domagala et al, 2018) where safety is critical issue. Mutual checking of proposed models is important in rapidly developing scientific area known as "surrogate models": creation of simpler model derived from more complex, but also numerically simulated (Gadek-Moszczak et al, 2015;Pietraszek et al, 2016;Filo et al, 2018;Osocha, 2018).…”