Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EXPERIMENTAL ANALYSIS OF A SHAPE MEMORY ALLOY OSCILLATOR WITH DISCONTINUOUS SUPPORT
Submission Author:
Vanderson Dornelas , RJ
Co-Authors:
Vanderson Dornelas, Marcelo Savi, sergio oliveira
Presenter: Marcelo Savi
doi://10.26678/ABCM.COBEM2023.COB2023-0412
Abstract
Non-smooth nonlinearities are often in nature being linked to friction phenomena or discontinuous characteristics of intermittent contacts. Non-smooth systems occur in various physical scenarios, such as rotodynamic and oil drilling. Vibration control is an interesting application considering non-smooth systems, especially those using smart materials such as shape memory alloys (SMAs). In this regard, several studies on the use of shape memory alloys in vibration control systems have been proposed in recent years. The use of SMAs in these applications exploits the ability to dissipate energy due to hysteretic behavior and also property variations. This paper presents an experimental study of the nonlinear dynamics of a shape memory oscillator composed of a car, free to move over a rail, connected by two springs and an excitation system. The discontinuous support is built by a linear spring considering a gap to the oscillator position. The proposed experimental system is instrumented to obtain all system state variables. Different experimental configurations are of concern: a system with SMA springs, without and with support; a system with a combination of linear and SMA springs, without and with support. Results allow one to evaluate the influence of the SMA elements on the system dynamics for different assemblies and excitation conditions, showing a rich dynamical behavior.
Keywords
Shape Memory Alloys, Dynamical Systems, Non-Smooth Systems, nonlinear dynamics, Experimental Observations
