“…Some authors use a pure torsional model [1,2,3,4,5], while others consider coupling mechanisms. For instance, lateral-torsional [6,7,8], axial-torsional [9,10], and fully lateral-axial-torsional coupled vibrations [11,12,13,14]. One can find single torsional models, lumped parameters representation, and continuous systems discretized using the finite element method.…”