Dynamical analysis of a 2-degrees of freedom spatial pendulum Stelian Alaci, Florina-Carmen Ciornei, Sorinel-Toderas Siretean, Mariana-Catalina Ciornei and Gabriel Andrei Ţibu MATEC Web Conf., 184 (2018) 01003 Published online: 31 July 2018 DOI: 10.1051/matecconf/201818401003