EXPERIMENTAL INVESTIGATION OF SHAPE MEMORY ALLOY TENDONS APPLIED FOR ATTENUATION OF VIBRATIONS IN A PRISMATIC TABLE
Fabiano Sangi de Oliveira1; Rômulo Pierre Batista dos Reis2; Antonio Almeida Silva3; Carlos José de Araújo3
1 UFERSA; 2 UFERSA / UFCG; 3 UFCG
doi:10.20906/CPS/COB-2015-0770
Resumo
There are several applications for shape memory alloys (SMA), especially as thermomechanical actuators of low weight and moderate workcapability compared to other conventional actuators. These characteristics of SMA actuators, among others, are desirable to attenuate vibrations in mechanical systems. In addition, it's known that mechanical systems can fail when subjected to excitation forces, especially in lightly damped systems, and near to resonance. The purpose of this paper is experimentally verifying the performance of SMA wire actuators as tendons to attenuate mechanical vibrations. For this, Ni-Ti SMA thin wires are installed in different configurations in a single-degree-of-freedom structure subjected to harmonic excitations. The obtained results demonstrate that the magnitude of the response can be significantly reduced by the use of the SMA wire tendons as vibration dampers. Interesting aspects are the low level of energy given off to dampen the system as well as a small electrical current intensity for activation of the SMA tendons. It is believed to be possible to extend the analysis to various system settings to be damped, and the use of different shapes of SMA actuators.
Palavras-chave: Shape memory alloys; Dynamics; Vibration attenuation