Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
CHOAS CONTROL OF AN SMA TWO-BAR TRUSS WITH CONSTRAINED THERMAL ACTUATION
Submission Author:
Dimitri Danulussi Alves Costa , SP
Co-Authors:
Dimitri Danulussi Alves Costa, Marcelo Savi, Davide Bernardini, Giuseppe Rega
Presenter: Dimitri Danulussi Alves Costa
doi://10.26678/ABCM.COBEM2021.COB2021-0703
Abstract
Smart structures are employed in various fields of engineering due to their adaptive behavior. This is achieved through the application of several strategies, including the design of multi-stable configurations and the use of smart materials. Shape memory alloys (SMAs) are one type of such materials due to the thermomechanical coupling of their properties. The use of such alloys introduces nonlinearities to the structure which can lead to a range of nonlinear behaviors including chaos. This complex behavior brings an opportunity to provide adaptability to the structure via the application of chaos control techniques. These methods are able to stabilize an unstable periodic orbit within the chaotic attractor with a small energy cost. The robustness of this approach is still not fully explored in the literature, especially in situations where SMA actuators are of concern with actuation constrained by the energy equation. This work explores the capabilities of SMA actuation in chaos control methods and investigates how different control strategies influence the controlled orbit stability, filling the lack of such studies in the literature. An SMA two-bar truss is investigated representing a multi-stable structure. The SMA thermomechanical behavior is modeled by a constitutive equation that takes into account hysteresis and the thermomechanical coupling due to phase transformations. Results show that, depending on the actuation, the dependency of the controlled orbit stability with energy transfer coefficients changes, and control properties are affected in different ways. Finally, a successful thermal control is achieved indicating that SMA thermal actuation can be applied successfully to such structures.
Keywords
Chaos Control, Shape Memory Alloy, nonlinear dynamics, Smart Structures
