Numerical and Analytical Study of the Torsional Stiffness of a Flexible Disks Coupling

Resumo

This work presents a study of torsional stiffness of flexible disk coupling used in synchronous generators
coupled in diesel combustion engines. Stiffness analyzes are important basic systems to identify possible instabilities in
torque transmission as a function of number disks. Torsional stiffness is an important parameter for the control of
torsional vibrations in rotating machines analytically obtained based on simplified models. As it is a simplified method,
the analytical method presents results, where constructive details of the coupling are not considered. This study focused
analyzes the torsional stiffness responses considering different numbers of disks, screws pretension and disk material
through numerical solution based on Finite Elements Method (FEM). The numerical results induced that the torsional
stiffness increases in a non-linear way with the number of disks, being this behavior also identified in the analytical
solution. It was also possible to verify that the screws pretension does not affect the torsional stiffness significantly.