Controle passivo de vibrações em máquinas rotativas utilizando fios de memória de forma

Abstract

This research deals with the passive control of mechanical vibrations on rotating machines by using SMA (Shape Memory Alloys) wires. Unlike other classes of smart materials, the technique conveyed allows for a simpler mechanical construction and offers new technological possibilities. Both numerical simulations and experimental procedures have been performed in the present doctorate thesis. The simulations have been implemented in the Matlab® platform. The numerical results reveal that the SMA wires can reduce the lateral vibrations amplitude of the rotating shaft to acceptable levels, as shown by time responses and orbit curves. Experimentally, it has been demonstrated that SMAs, as represented by metallic wires, can be effective in lateral vibration reduction. It has also been verified that the temperature of the SMA wire can be employed to tune the vibration control system. This way, a passive control system is proposed taking advantage of intrinsic characteristic SMA wires.