Design and modeling of mechanical systems - IV proceedings of the 8th conference on design and modeling of mechanical systems, CMSM'2019, March 18-20, Hammamet, Tunisia - Aifaoui, Nizar; Affi, Zouhaier; Abbes, Mohamed Slim; Walha, Lassad; Haddar, Mohamed; Romdhane, Lotfi; Benamara, Abdelmajid; Chouchane, Mnaouar; Chaari, Fakher (Springer, 2020)